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OWASP ModSecurity Core Rule Set (CRS) CHANGES

Report Bugs/Issues to GitHub Issues Tracker or the mailinglist

Version 4.0.0 - 2022-06-??

Important changes:

  • Introduce plugin architecture for extending CRS and minimizing attack surface. Application exclusions and less-used functionality have been migrated to plugins. See the plugin repository at https://github.com/coreruleset/plugin-registry (Christian Folini, Max Leske, Jozef Sudolský, Andrew Howe) [#2038, #2448, #2404]
  • Implement early blocking (Christian Folini) [#1955]
  • Refactor and rename anomaly scoring variables and paranoia level definition (Simon Studer) [#2417]
  • Add granular control over reporting levels in 9801xx rules (Simon Studer, Andrew Howe, Christian Folini) [#2482, #2488]
  • Made all formerly PCRE-only regular expressions compatible with Re2/Hyperscan WAF engines (Max Leske, Felipe Zipitria, Allan Boll, Franziska Bühler) [#1868, #2356, #2425, #2426, #2371, #2372]
  • Publish nightly packages (Felipe Zipitria) [#2207]
  • Drop HTTP/0.9 support to resolve FP (Federico G. Schwindt) [#1966]

New functionality and detections:

  • Detect Log4j / Log4Shell (Christian Folini, Max Leske, Andrew Howe) [#2349]
  • Detect Spring4Shell (Christian Folini, Andrea Menin) [#2464]
  • Detect JavaScript prototype pollution (Walter Hop) [#2411]
  • Detect use of common webshells by inspecting response (Jozef Sudolský, Andrea Menin) [#1962, #2039, #2116]
  • Add phpMyAdmin exclusion rules (now a plugin) (Jozef Sudolský) [#1951]
  • Add phpBB exclusion rules (now a plugin) (Jozef Sudolský) [#1893]
  • Deny uploading .jsp and .jspx files (Walter Hop) [#2456]
  • Detect path traversal in file upload (k4n5ha0, Franziska Bühler, Felipe Zipitria) [#2451]
  • Block access to AWS cli files (Jozef Sudolský) [#2439]
  • Detect /proc and /sys access attempts (Andrew Howe) [#2154]
  • Detect common IP-based SSRF targets (Felipe Zipitria) [#2259]
  • Detect email protocol attacks (Felipe Zipitria) [#2322]
  • Detect more error based SQL injections (Jozef Sudolský) [#2429]
  • Detect SQLi with 'drop' keyword (Jozef Sudolský) [#2218]
  • Detect RCE attempts with uninitialized shell vars (Andrea Menin) [#2151]
  • Detect more unix RCE commands (Felipe Zipitria) [#2129]
  • Detect SQLi with 'if exists' (NiceYouKnow) [#2121]
  • Detect sqlite system command injection (flo405, Andrea Menin, Christian Folini) [#2032]
  • Include IPv6 in Host Header check (itsTheFae, Ervin Hegedus, Jozef Sudolský) [#1929]
  • Block access to WEB-INF directory (Jozef Sudolský) [#2092]
  • Block access to various sensitive files (Jozef Sudolský) [#1960]
  • Improve SQLi detection with spaces (Manuel Spartan, Max Leske) [#2436, #2290]
  • Improve SQLi detection with 'not between' (NiceYouKnow, Max Leske, Franziska Bühler) [#2115]
  • Fix blind SQLi detection in rule 942160 (Franziska Bühler, Christian Folini) [#1956]
  • Lower FP by moving '-->' keyword to PL2 (Paul Beckett) [#2060]
  • Run libinjection XSS detector on request filename in PL2 (Andrew Howe) [#2208]
  • Validate Sec-Fetch-User header (somechris) [#2020]
  • Detect Krzana bot (Deepshikha Sinha) [#2432]
  • Detect CensysInspect and seoscanners.net crawlers (Andrew Howe) [#2155]
  • Detect burpcollaborator scanner (Amir Hosein Aliakbarian) [#2152]
  • Detect QQGameHall malware (Walter Hop) [#2144]
  • Detect 'httpx' scanner (Will Woodson) [#2045]
  • Detect 'ecairn' crawler (Jozef Sudolský) [#2024]
  • Detect LeakIX scanner (Jozef Sudolský) [#1961]
  • Unified regexp utils to automate error-prone actions and automatically update rules from regexp sources (Max Leske) [#2149, #2223, #2423, #2495, #2489, #2473]
  • Add Google OAuth2 exclusion plugin (Jozef Sudolský) [#2388]
  • Validate Accept-Encoding headers (Franziska Bühler) [#2357]
  • Deny access to sslvpn_websession (Jozef Sudolský) [#2338]
  • Detect 'Invoke-WebRequest' command (Paul Beckett) [#2271]
  • Update send-payload-pls.sh (Manuel Spartan) [#2288]
  • Exclusion profiles and DOS rules have been moved from CRS to plugins (Andrew Howe) [#2469]
  • IP reputation rules have been moved from CRS to plugins (Simon Studer) [#2482]
  • Tests: add utility script to find rules without tests (Ervin Hegedus) [#2279]
  • Add crs-rules-check tool that runs sanity checks against rules (Ervin Hegedus) [#2236]
  • Tests: add utility to find longest data lengths (Ervin Hegedus) [#2277]
  • Improve rule-ctl script to modify rules (Max Leske) [#2193]
  • Add utility to change version numbers (Ervin Hegedus) [#2085]

Improved compatibility:

  • Update backslashes to \x5c representation for better compatibility with known WAF engines (Andrew Howe, Max Leske) [#2335, #2345, #2375, #2376, #2399, #2400, #2402, #2410, #2420, #2441, #2442, #2454, #2426]
  • Don't cook hex escapes (Max Leske) [#2215]
  • Adapt rule 942440 to work in all ModSecurity versions (Andrew Howe) [#2201]

Fixes and improvements:

  • Fix bypass in rule 931130 (Andrea Menin) [#2479]
  • Fix bypass in rule 933210 (Andrea Menin) [#2214]
  • Fix bypass in rule 942190 (Andrea Menin) [#1910]
  • Fix triple dot false negative in rules 930100, 930110 (Franziska Bühler) [#2309, #2310]
  • Fix false negative in rule 942230 (Max Leske) [#2348]
  • Fix FP in CalDAV Content-Type (Vandan Rohatgi) [#2505]
  • Lower FP in MySQL data leakage rule (Jozef Sudolský) [#2490]
  • Lower FP in SQL function names by splitting between PL1/PL2 (Jozef Sudolský) [#2480]
  • Fix FP in 'having' SQLi (Felipe Zipitria) [#2248]
  • Fix FP in JWT tokens (Andrea Menin) [#2460]
  • Fix FP on 'time' and 'ping' keywords (Walter Hop) [#2457]
  • Fix FP in 'application/*+json' Content-Type (Mirko Dziadzka, Walter Hop) [#2455]
  • Fix FP in Sec-CH-UA header (Franziska Bühler) [#2361]
  • Fix FP in PostgreSQL error messages (Jozef Sudolský, Franziska Bühler) [#1870, #2313]
  • Fix FP in Sybase error message (Jozef Sudolský) [#2307]
  • Fix FP in base64 content (Jozef Sudolský) [#2226]
  • Fix FP in XMLNLS (Walter Hop) [#2192]
  • Fix FP in rule 941310 with Russian characters (Max Leske) [#2107]
  • Fix FP in rule 942300 by adding word boundary checks (Franziska Bühler) [#2099]
  • Fix FP in SQLi by adding word boundary checks (Jozef Sudolský) [#2078]
  • Fix FP in SQLi with keyword 'union' (Franziska Bühler) [#2058]
  • Fix FP in rule 942230 with 'case' (Franziska Bühler) [#2035]
  • Fix FP for YAM package manager (Jozef Sudolský) [#2022]
  • Fix FP for '..' without slashes (Tetrik, Walter Hop) [#2016]
  • Fix FP in rule 932115 on 'sort' (Franziska Bühler) [#2012]
  • Fix FP in rule 933210 when cookie contains slash (Ervin Hegedus) [#1996]
  • Fix FP in rule 932100 (Franziska Bühler) [#1954]
  • Fix FP in Google OAuth2 (Jozef Sudolský, Christian Folini) [#1958]
  • Nextcloud: fix FPs (kam821, Jozef Sudolský, ntimo, Felipe Zipitria, pyllyukko) [#1840, #1843, #1847, #1946]
  • Fix FP on .axd in restricted extensions, these are public (Jozef Sudolský) [#1925]
  • Fix FP on 'version' string in Content-Type header (Jozef Sudolský) [#1901]
  • Fix FP in rule 941120 by adding character limit (Christian Folini) [#1872]
  • Fix FP in Content-Type with '#' character (Jozef Sudolský) [#1856]
  • phpMyAdmin: Fix FPs (Jozef Sudolský) [#2172, #2249, #2321, #2351]
  • WordPress: fix FPs (Jozef Sudolský) [#1899, #1971, #2320]
  • WordPress: fix FPs in Site Health page (Robert de Boer, Fregf, Walter Hop) [#1895, #1920]
  • WordPress: fix FPs and improve performance (Walter Hop) [#1997, #2311]
  • XenForo: fix FPs (Walter Hop, ThanhPT) [#1844, #1865, #1894, #1998, #2421]
  • phpBB: Fix FPs (Jozef Sudolský) [#2057, #2180, #2299, #2343]
  • Fix bypass in rule 933210 (Walter Hop) [#2033]
  • Improve sampling mode efficiency (Paul Beckett) [#2094]
  • Move rules to the lowest phase possible based on their inputs (Ervin Hegedus) [#1941]
  • Stop decoding things twice (Federico G. Schwindt) [#1845]
  • contributing.md: add more information for new developers (Andrew Howe) [#2487]
  • Move 'ecairn' from scanners to crawlers (Felipe Zipitria) [#2408]
  • 93231x rules: simplify already-lowercased regexps (Felipe Zipitria) [#2485]
  • remove double m,n in regexp (Felipe Zipitria) [#2484]
  • update OWASP vulnerability urls (Walter Hop) [#2467]
  • docs: update policy to include signed releases (Felipe Zipitria) [#2465]
  • Change documentation git module link to https (İlteriş Eroğlu) [#2461]
  • Optimize regex in 942440 (Felipe Zipitria) [#2459]
  • Improve performance by removing unnecessary lowercase transformations (Jozef Sudolský) [#2106]
  • change-version: fix typo (Deepshikha Sinha) [#2430]
  • Renaming tx.blocking_early to tx.early_blocking (Christian Folini) [#2414]
  • Add editorconfig file to keep spacing in good shape (Felipe Zipitria) [#2407]
  • Remove all whitespace at EOL (Felipe Zipitria) [#2405, #2406]
  • 920520: improve comment (Max Leske) [#2391]
  • Fix yamllint (Felipe Zipitria) [#2387]
  • README: fix typos (Priyam Patel) [#2494]
  • Initialization: fix typo (Elia Pinto) [#2366]
  • Fix changed Trustwave URLs (Elia Pinto, henkworks, Felipe Zipitria) [#2213, #2364, #2204]
  • Improve logging in some special cases (Jozef Sudolský) [#2347]
  • Rename nodejs to generic category (Felipe Zipitria) [#2340]
  • Fixed assembly of 920120-no-backtracking.data (Max leske) [#2333]
  • Move regexp-assembly to separate directory (Felipe Zipitria) [#2327]
  • Fix attack type of a few rules (Jozef Sudolský) [#2324]
  • Optimize regex in 942400 (Jozef Sudolský) [#2323]
  • Web shells: optimize regexps (Jozef Sudolský) [#2315]
  • Move 941120 from PL1 to PL2 (Christian Folini) [#2306]
  • Move 920300 from PL2 to PL3 (Franziska Bühler) [#2013]
  • Fix ReDOS in rule 942350 (Andrea Menin) [#2300]
  • Fix ReDOS in rule 941140 (Andrea Menin) [#2050]
  • Fix false negative in rule 920480 (katef, Federico G. Schwindt) [#1957]
  • Disassemble regexp in rule 930100 (Andrew Howe) [#2298]
  • Amend 920300 to exclude CONNECT requests (Andrew Howe) [#2297]
  • Restrict rule 941170 (Andrea Menin) [#2292]
  • Fix NextCloud example comments (Joost de Keijzer) [#2282]
  • Fix ruleid typos in comments (Paul Beckett) [#2263]
  • Fix capec id for crawlers (Jozef Sudolský) [#2258]
  • Fix docs for Apache (Jozef Sudolský) [#2238]
  • Align actions in right order (Ervin Hegedus) [#2237]
  • Fix logging by moving ctl action in chain to 2nd rule (Franziska Bühler) [#2202]
  • Fix rule 9004110 to use newer format for var (Andrew Howe) [#2200]
  • Remove the fuzzy regularity of the 942310 rule (NiceYouKnow) [#2189]
  • docs: update links and format of known bugs (Felipe Zipitria) [#2186]
  • Added missing " from the end of actions list (Ervin Hegedus) [#2184]
  • sponsors.md: add file (Christian Folini) [#2174]
  • crs-setup.conf: add note to allowed_request_content_type settings (Ervin Hegedus) [#2164]
  • README: update for Nginx (vijayasija99) [#2158]
  • Replace usage of ctl:ruleEngine=Off by ctl:ruleRemoveByTag=OWASP_CRS (Jozef Sudolský) [#2156]
  • Remove old commented-out rule 910110 (Paul Beckett) [#2148]
  • Replace Blacklist and Whitelist with Deny list and Allow list (Paul Beckett) [#2137]
  • Fix donate URL (Felipe Zipitria) [#2132]
  • Owncloud: Fix rule 9003001 to match both dav and webdav (Abu Dawud) [#2130]
  • Add link to slack invitation to README (Christian Folini) [#2122]
  • Fix bug in rule 942190 and add test case (NiceYouKnow, Max Leske, Franziska Bühler) [#2112]
  • Added directories needed for volume mounts to Git (Max Leske) [#2103]
  • Added a note to a commented rule about unsupported action in v3 (Ervin Hegedus) [#2098]
  • Added missing space after comment mark (Ervin Hegedus) [#2097]
  • Fix typo in sampling mode description (Christian Folini) [#2090]
  • contributing.md: rewording (Christian Folini) [#2077]
  • Replaced ARGS by ARGS_GET in rules in phase:1 (Ervin Hegedus) [#2063]
  • Fix OWASP Slack URL (Jozef Sudolský) [#2056]
  • Add example exclusion rule for monitoring agents (Andrea Menin) [#2037]
  • Fix Nginx logging in docker-compose (Felipe Zipitria) [#2036]
  • Fix Sec-CH-UA and Sec-CH-UA-Mobile request header validation (somechris) [#2028]
  • Fix typo in comment (Federico G. Schwindt) [#2011]
  • Fix magic number that crashes old PHP versions (Kyzentun, Walter Hop) [#2010]
  • Add timezone variable to docker-compose (Felipe Zipitria) [#1995]
  • Enhancement of installation process for Nginx / IIS (Jozef Sudolský) [#1988]
  • Removing %{MATCHED_VAR} from logging (Jozef Sudolský) [#1985]
  • Drop unneeded capture groups (Federico G. Schwindt) [#1983]
  • Add support for sec-ch-ua and sec-ch-ua-mobile within Validate Bytes (Chaim Sanders) [#1970]
  • Update description of rule 920350 (Christian Folini) [#1952]
  • Fix stricter sibling comment for SQL Injection (Stephen Sigwart) [#1913]
  • Fix chained condition for correlation rules 980120 and 980150 (Simon Studer) [#1898]
  • Link fix for docs/OWASP-CRS-Documentation submodule (Ervin Hegedus) [#1885]
  • Add missing PL tags to all rules (Ervin Hegedus) [#1882]
  • Remove 'log' from rules and let SecDefaultAction decide what to do (Federico G. Schwindt) [#1876]
  • Remove unneeded transformation from MATCHED_VARS (Federico G. Schwindt) [#1852]
  • Fix indentations (Ervin Hegedus) [#1851]
  • Drop unneeded escapes (Federico G. Schwindt) [#1842]
  • Tests: 100% test coverage (Christian Folini, Franziska Bühler, Paul Beckett, Ervin Hegedus, Juan-Pablo Tosso, NiceYouKnow)
  • Tests: Normalized keys in test files (Ervin Hegedus) [#2493]
  • Tests: Fix test titles (bxlxx.wu, Ervin Hegedus) [#2504, #2497]
  • Tests: use same user-agent (Felipe Zipitria) [#2393]
  • Tests: fixed end boundary in 932180-2 (Ervin Hegedus) [#2377]
  • Tests: clean up quoting (Max Leske) [#2370]
  • Tests: add tests for 920120 (Max Leske) [#2369]
  • Tests: improve test setup, rewrite of log checker (Max Leske) [#2363]
  • Tests: add common and uniform http headers to tests (Felipe Zipitria) [#2362]
  • Tests: add tests for 921180 (Juan-Pablo Tosso, Christian Folini) [#2308]
  • Tests: add tests for 920275, 913101, 913102, 920410, 920171, 932190, 932110, 932105 (Ervin Hegedus) [#2021, #2253, #2257, #2294, #2295, #2285, #2286, #2287]
  • Tests: add tests for 932170, 932171, 932106, 932180, 942170, 942251, 942460 (Franziska Bühler) [#2252, #2254, #2255, #2280, #2283, #2284, #2269, #2268]
  • Tests: add tests for 933111, 933190, 933200 (NiceYouKnow) [#2281]
  • Tests: add tests for 920341 (Juan-Pablo Tosso) [#2266]
  • Tests: add tests for FP 921110 request smuggling (Franziska Bühler) [#2102]
  • Tests: Add a Chrome and Firefox version 100 UA (Mike Taylor) [#2325]
  • Tests: Add tests for 920121, 932150, 932160, 932120, 932130, 921151 (Paul Beckett) [#2264, #2275, #2276, #2272, #2273, #2270]
  • Tests: add test against FP when using urlDecode for 932140 (Max Leske) [#2191]
  • Tests: fix Python version for tests (Max Leske) [#2247]
  • Tests: fix 933160-21 and 942500-1 due to invalid URI (Takaya Saeki) [#2168]
  • Tests: remove broken test 932100-3 (Felipe Zipitria) [#2165]
  • Tests: fix logging problem for Nginx (vijayasija99) [#2157]
  • Tests: use only valid YAML (Felipe Zipitria) [#2080]
  • Tests: fix requirements version (nobletrout) [#2004]
  • Tests: fix tests lacking charset (Felipe Zipitria) [#1932]

Version 3.3.2 - 2021-06-30

Fixes and improvements:

  • Fix CVE-2021-35368 WAF bypass using pathinfo (Christian Folini)

Version 3.3.0 - 2020-07-01

Important changes:

  • The format of crs-setup.conf variable "tx.allowed_request_content_type" has been changed to be more in line with the other variables. If you have overridden this variable, please see the example in crs-setup.conf for the new separator to use.

New functionality:

  • Block backup files ending with ~ in filename (Andrea Menin)
  • Detect ffuf vuln scanner (Will Woodson)
  • Detect Nuclei vuln scanner (azurit)
  • Detect SemrushBot crawler (Christian Folini)
  • Detect WFuzz vuln scanner (azurit)
  • New LDAP injection rule (Christian Folini)
  • New HTTP Splitting rule (Andrea Menin)
  • Add .swp to restricted extensions (Andrea Menin)
  • Allow CloudEvents content types (Bobby Earl)
  • Add CAPEC tags for attack classification (Fernando Outeda, Christian Folini)
  • Detect Unix RCE bypass techniques via uninitialized variables, string concatenations and globbing patterns (Andrea Menin)

Removed functionality:

  • Removed outdated rule tags WASCTC, OWASP_TOP_10, OWASP_AppSensor/RE1, and OWASP_CRS/FOO/BAR; note that tags 'OWASP_CRS' and 'attack-type' are kept. (Christian Folini)

Improved compatibility:

  • Changed variable to lowercase (modsec3 behavior fix) (Ervin Hegedus)

Fixes and improvements:

  • WordPress: Add support for upload image/media in Gutenberg Editor (agusmu)
  • Prevent bypass of rule 921110 (Amit Klein, Franziska Bühler)
  • Prevent bypass of rule 921130 (Amit Klein, Franziska Bühler)
  • fix CVE msg in rules 944120 944240 (Fernando Outeda)
  • Remove broken or no longer used files (Federico G. Schwindt)
  • Make content-type case insensitive (Franziska Bühler)
  • Move /util/docker folder from v3.3/dev branch to dedicated repo (Peter Bittner)
  • feat(lint): split actions in linting and regression (Felipe Zipitria)
  • Fix FP in 921120 (Franziska Bühler)
  • Add missing OWASP_CRS tags (Christian Folini)
  • Fix GHA badges (Federico G. Schwindt)
  • feat(badge): add apache license badge
  • fix typos found by fossies codespell (Tim Herren)
  • Decrease processing time of rules (Ervin Hegedüs)
  • handle multiple directives in 920510 (Andrea Menin)
  • handle multiple directives in 920510 (Andrea Menin)
  • fix(ci): use log_contains instead (Felipe Zipitria)
  • Move test where it belongs (Federico G. Schwindt)
  • fix(ci): use docker in DetectionOnly (Felipe Zipitria)
  • fix(rule): remove dangling whitespace (Felipe Zipitria)
  • fix(ci): run actions on .github change (Felipe Zipitria)
  • fix(docs): update badges and links in readme (Felipe Zipitria)
  • README: update repo link (Walter Hop)
  • Update README: Copyright 2019 -> 2020 (Christian Folini)
  • fix(ci): run tests also on PRs (Felipe Zipitria)
  • fix(ci): change test name and fix default params (Felipe Zipitria)
  • Restore Travis Status (was in the wrong repo) (Christian Folini)
  • Remove outdated Travis status after migration (Christian Folini)
  • feat(ci): adds github actions testing (Felipe Zipitria)
  • fix(migration): post migration tasks (Felipe Zipitria)
  • feat(templates): add text to gihub templates about migration. To be reverted after migation is done. (Felipe Zipitria)
  • Added more explanations to comment of 920300 (Christian Folini)
  • Added 'ver' action with current version to all necessary rules (Ervin Hegedus)
  • Update nextcloud excl rules and shorten var (Franziska Bühler)
  • Change to preferred lowercase var (Franziska Bühler)
  • Set var to lowercase and change comment (Franziska Bühler)
  • Resolve issue with allowed_request_content_types (Franziska Bühler)
  • Allow REPORT requests without Content-Type header in Nextcloud (pyllyukko)
  • Suppress rule 200002 when editing contacts in Nextcloud (pyllyukko)
  • XenForo: update exclusions (Walter Hop)
  • WordPress: exclude additional URL fields in profile editor (Walter Hop)
  • add www to link (NullIsNot0)
  • Fix link for 941310 Old link does not work anymore. Change it to new one. (NullIsNot0)
  • Add Content-Type: multipart/related as allowed default (jeremyjpj0916)
  • Resolve issue 1722 and fix content-type whitelisting (Franziska Bühler)
  • make severities and scores consistent (Walter Hop)
  • add QQGameHall UA (#1731) (Andrea Menin)
  • another test (Allan Boll)
  • Add word boundaries around values in SQL tautologies (942130) (Allan Boll)
  • Move tests to their own file, while here also correct permissions for 920180. (Federico G. Schwindt)
  • Rule to check if both C-L and T-E are present (#1310) (Federico G. Schwindt)
  • Fixes for 2 tests in 921200 (Christian Folini)
  • XenForo: add exclusions, remove unnecessary chains (#1673) (Walter Hop)
  • Fix FPs for 942350 (#1706) (Franziska Bühler)
  • Fix typos found by codespell / Fossies project (#1702) (Simon Studer)
  • Ignore check of CT header in POST request if protocol is HTTP/2 (Ervin Hegedus)
  • Narrowing down the subpattern .*? in 941130 (Christian Folini)
  • Restricting a wide regex a bit (Christian Folini)
  • Drop escapes (Christian Folini)
  • Fix FP in 941130 and rearrange regex with new regex-assemble file (Christian Folini)
  • Ignore check of CT header in POST request if protocol is HTTP/2 (Ervin Hegedus)
  • Remove trailing dot in several msg actions (#1678) (Tim Herren)
  • Replace REQUEST_BODY with ARGS on 930100 and 930110 (#1659) (Andrea Menin)
  • Temporary travis workaround to buy time and fix it for good (#1684) (Andrea Menin)
  • Add regression tests (Franziska Bühler)
  • Fix FP with create with 942360 (Franziska Bühler)
  • Avoid embedded anchors in CRS rule 942330 (Allan Boll)
  • Update 942450 for less false positives, more tests (#1662) (Will Woodson)
  • Ensure single ranges are also checked (#1661) (Federico G. Schwindt)
  • WordPress: also exclude posts/pages endpoint in subdirectories (Walter Hop)
  • For bugs, also ask for the environment (#1657) (Federico G. Schwindt)
  • XenForo: fix incorrect escape (Walter Hop)
  • XenForo: additional exclusions (Walter Hop)
  • Pattern cleanup across several rules (#1643). Drop unneeded non-capture groups; No need to escape "-" outside character classes And only if it is not at the end. (Federico G. Schwindt)
  • Improve rule 941350: Previously, this rule will also match on the equivalent to "<..<". Rewrite it so it is only triggered by the equivalent to "<..>", simplifying the pattern quite a bit as a bonus. While here add a link describing the bypass for future reference.
  • Fix test Was using the equivalent to "<...<" instead of "<...>". (Federico G. Schwindt)
  • Move the help and support link to contacts (#1647) While here rename to ensure they are presented in the right order and minor cosmetics. (Federico G. Schwindt)
  • Move remaining regression test data file to new folder, cleanup README (#1646) (Peter Bittner)
  • Also ask for the paranoia level (Federico G. Schwindt)
  • Make it a tiny bit more colorful (Federico G. Schwindt)
  • Spacing (Federico G. Schwindt)
  • Fix emoji (Federico G. Schwindt)
  • Switch to multiple templates for github issues (#1644) (Federico G. Schwindt)
  • Fix paranoia-level log description (Andrea Menin)
  • change IRC to Slack (Walter Hop)
  • fix spacing (Walter Hop)
  • Moving tests and documentation folders (#1627) (Soufiane Benali)
  • add triggered rule (#1636) (Andrea Menin)
  • Drop the translate header from the restricted list Fixes #1410. (Federico G. Schwindt)
  • Mark stale issues (Federico G. Schwindt)
  • Added support for <? in Rule 933100 (meetug)
  • Added test cases (NullIsNot0)
  • Update REQUEST-920-PROTOCOL-ENFORCEMENT.conf (NullIsNot0)
  • Update re for Rule ID: 920480 Update regular expression (NullIsNot0)
  • Create SECURITY.md (Chaim Sanders)
  • Rule: 920480. Make rx recognize charset with quotes. Make rule ID: 920480 recognize not only Content-Type: charset=utf-8 but also charset put in single or double quotes: Content-Type: charset="utf-8" Content-Type: charset='utf-8' (NullIsNot0)
  • Make rule 933100 RE2 compatible (meetug)
  • Fix typo in config file inclusion (Felipe Zipitria)
  • Correct rule 941310 to use single-byte variants and fix FPs (#1596). Fix test to use the single byte characters Add a test that uses utf-8 as well. Change pattern to use the single-byte variants Patterns in ModSecurity are not treated as UTF strings. Fixes #1595. Add negative tests and update descriptions Improve pattern Change it to avoid FPs for \xbc\xbc and \xbe\xbe (i.e. << and >>). Use negated classes for better performance. (Federico G. Schwindt)
  • Add test for issue #1580 (#1612) (Federico G. Schwindt)
  • removes t:lowercase (Andrea Menin)
  • Move integration tests to their own job (#1608) Also cleanup branches' list. (Federico G. Schwindt)
  • Add PL1 tag. (Anna Winkler)
  • Change version number for full version name (Felipe Zipitria)
  • Better document legacy conversion procedure Add text with instructions for a simple conversion utility. (Felipe Zipitria)
  • Correct example text regarding GeoIP. Add maxmind tool for downloading files (Felipe Zipitria)
  • Ignore configuration files generated by the JetBrains editors (Anna Winkler)
  • Update name of branch to use for feature branches. Minor syntax updates. (Anna Winkler)
  • Minor optimisation (Emile-Hugo SPIR)
  • Also fix the as herefrom pattern (Emile-Hugo SPIR)
  • More conservative fix (Emile-Hugo SPIR)
  • Update the source file (Emile-Hugo SPIR)
  • Fix a FP (, aside from) (Emile-Hugo SPIR)
  • regression fix for #1581 (emphazer)
  • Change order to check ip first in both rules (Felipe Zipitria)
  • Change chain order (Felipe Zipitria)
  • Fix spacing in text (Felipe Zipitria)
  • Add link to mailing list archives (Felipe Zipitria)
  • Adding new test for 941150 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941340 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941280 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941170 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941250 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941220 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941330 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941300 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941230 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941260 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941290 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 941270 based on XSS cheatsheet by portswigger (Christian Folini)
  • Adding new test for 942180 based on XSS cheatsheet by portswigger (Christian Folini)
  • Update mailing list links to google group (Felipe Zipitria)
  • Fix typo and add 2 new entries to 941160 (Franziska Bühler)
  • Switch to dates in YYYY-MM-DD format IOW iso 8601. While here add newlines and drop empty categories. (Federico G. Schwindt)
  • Update badges, add v3.3 and remove v3.0 (#1557) (Federico G. Schwindt)
  • Rearange characters and add positive and negative test cases. Moved the dash to the end of the character set to avoid escaping it. Added test with all the new characters and a test for multiple whitespaces. Allowed a previously blocked charset. (Tim Herren)
  • 920470: include chars from rfc 2046 RFC 2046 allows additional chars for the boundary. \d removed as it is covered by \w in the regex. Removed unnecessary escapes. (Tim Herren)
  • Fix bypass in 931130 Don't rely on beginsWith as it might allow attackers to create subdomains matching the prefix. Add tests to cover this and other cases. The latter fixes #1404. (Federico G. Schwindt)
  • fix rule regex due to remove t:removeComments (Andrea Menin)
  • 920470: include chars from rfc 2046 RFC 2046 allows additional chars for the boundary. \d removed as it is covered by \w in the regex. Removed unnecessary escapes. (Tim Herren)
  • update Dockerfiles and Travis to use v3.3/dev (Walter Hop)

Version 3.2.0 - 2019-09-24

New functionality:

  • Add AngularJS client side template injection 941380 PL2 (Franziska Bühler)
  • Add docker-compose.yaml and example rule exclusion files for docker-compose (Franziska Bühler)
  • Add extended access.log format to Docker (Franziska Bühler)
  • Add libinjection check on last path segment (Max Leske, Christian Folini)
  • Add PUBLIC identifier for XML entities (#1490) (Rufus125)
  • Add .rdb to default restricted_extensions (Walter Hop)
  • Add .swp to default restricted_extensions (Andrea Menin)
  • Add rule 933200 PHP Wrappers (Andrea Menin)
  • Add send-payload-pls.sh script to test payload against multiple paranoia levels (Christian Folini, Manuel Spartan)
  • Add support for shell evasions with $IFS (Walter Hop, Chaim Sanders)
  • Add unix-shell commands (Christoph Hansen, Chaim Sanders)
  • Also inspect the path for the script tag (Federico G. Schwindt)
  • Detect 80legs, sysscan, Gobuster scanners (Brent Clark)
  • Detect CGI source code leakages (Christoph Hansen, Walter Hop)
  • Detect 'crawler' user-agent (Federico G. Schwindt)
  • Detect Jorgee, Zgrab scanners (Walter Hop)
  • Detect MySQL in-line comments (Franziska Bühler)
  • Detect Wappalyzer scanner (Christian Folini, Chaim Sanders)
  • Java RCE: Add struts namespaces (Walter Hop)
  • Java RCE: Detect more java classes (Manuel Leos)
  • Javascript: Add 941370 preventing a bypass for 941180 (Andrea Menin)
  • Make CRS variables configurable in Docker image (Franziska Bühler)
  • New PL3 rule 920490 to protect against content-type charset bypassing (Christian Folini)
  • Node.js unserialization + javascript RCE snippets (Walter Hop)
  • Request smuggling: Also cover pre http/1.0 requests (Federico G. Schwindt)
  • Restricted files: Added many dotfiles (Dan Ehrlich)
  • SQLi bypass detection: ticks and backticks (Franziska Bühler)
  • XenForo rule exclusion profile (Walter Hop)

Removed functionality:

  • Remove unused protected_uploads setting from setup (Walter Hop)
  • Remove deprecated tx.msg and tx.%{rule.id}-... (Federico G. Schwindt)
  • Remove deprecated upgrade script (Walter Hop)

Improved compatibility:

  • Add OWASP_CRS tags for ModSec 3 changes and replace ruleRemoveTargetByTag arguments (Ervin Hegedus)
  • Replace @contain % with @rx 25; ModSec 3 fails to parse % by itself (or escaped). (Federico G. Schwindt)
  • RE2 compatibility for 941130, 920220, 920240, 920230, 920460, 942200, 942370 (Allan Boll)
  • Hyperscan compatibility and simplification for 942450 (Allan Boll)

Fixes and improvements:

  • 932140: fix ReDoS in FOR expression (Walter Hop)
  • 933200: Simplify pattern (Federico G. Schwindt, Andrea Menin)
  • 941380: fix anomaly score variable (Franziska Bühler)
  • 942510, 942511: fix anomaly score variable (Walter Hop)
  • Add content-type application/csp-report (Andrea Menin)
  • Add content-type application/xss-auditor-report (Andrea Menin)
  • Add CRS 3.2 Badge build support. (Chaim Sanders)
  • Add CVE numbers for Apache Struts vulnerabilities to comments in rules (Franziska Bühler)
  • Add CVE-2018-11776 to comments of 933160 and 933161 (Franziska Bühler)
  • Add CVE-2018-2380 to comments of rules (Franziska Bühler)
  • Add default env vars for anomaly scores in Docker (Franziska Bühler)
  • Add missing OWASP_CRS tags to 921xxx rules (Walter Hop)
  • Add REQUEST_FILENAME to rule id 944130 and add exploits to comment (Franziska Bühler)
  • Add spaces in front of closing square brackets (Franziska Bühler)
  • Add travis changes (#1316) (Chaim Sanders)
  • Allow dot characters in Content-Type multipart boundary (Walter Hop)
  • Also handle dot variant of X_Filename. PHP will transform dots to underscore in variable names since dot is invalid. (Federico G. Schwindt)
  • As per the ref manual, it is compressWhitespace (Federico G. Schwindt)
  • Avoid php leak false positive with WOFF files (Manuel Spartan)
  • Bring back CRS 2.x renumbering utility (Walter Hop)
  • Clean up travis and reorg (Federico G. Schwindt)
  • Code cosmetics: reorder the actions of rules (Ervin Hegedus)
  • Content-Type is case insensitive (Federico G. Schwindt)
  • Disassembled 941160 (Franziska Bühler)
  • Drop separate regexp files. They are not really needed and save us from updating multiple places. (Federico G. Schwindt)
  • Drop t:lowercase from 941350 (Federico G. Schwindt)
  • Drop unneeded capture groups and tidy up (Federico G. Schwindt)
  • Drop unneeded capture groups and tidy up regexps (Federico G. Schwindt)
  • Drop unneeded unicode from 941110. Add tests to cover a few more variants as well as a negative test (Federico G. Schwindt)
  • Fix 920440 "URL file extension is restricted by policy" regex (Andrea Menin)
  • Fix 920460 test (Federico G. Schwindt)
  • Fix 942101 and 942460 by adding to sqli_score variable (Christian Folini)
  • Fix checking the existence of 'HTTP' trailing request verb and request path in the payload for HTTP request smuggling; decreases false-positives on free-form text. (Yu Yagihashi)
  • Fix commit default for non 2.9 branch (Chaim Sanders)
  • Fix CRS2->CRS3 mapping table (973344 -> 941100) (Chaim Sanders)
  • Fix date (Chaim Sanders)
  • Fix Docker image SSL support (Franziska Bühler)
  • Fix duplicate .env (jschleus, Chaim Sanders)
  • Fix executing paranoia level counters (Christian Folini)
  • Fix indentation and python version in crs2-renumbering script (Chaim Sanders)
  • Fix input / headers misordering (Christian Folini)
  • Fix path traversal attack pattern at id:930110 (Ervin Hegedus)
  • Fix regexp in Docker image (Franziska Bühler)
  • Fix regexp with incorrect dot '.' escape in rule 943120 (XeroChen)
  • Fix request header Sec-Fetch-User false positive (na1ex)
  • Fix runaway regexp in 942260. Add variant regexp assemble script to handle possessive qualifiers. Use possessive qualifiers to tight this up and solve ReDoS problem. (Federico G. Schwindt)
  • Fix small typo in variable (Felipe Zipitria)
  • Fix spelling error in variable name (supplient)
  • Fix transform name pointed out by secrules_parsing (Federico G. Schwindt)
  • Fix Travis Merge not being able to find HEAD (Chaim Sanders)
  • Fix vulnerable regexp in rule 942490 (CVE-2019-11387) (Christoph Hansen)
  • Fix wrong regex, assembly result, in 942370 (Franziska Bühler)
  • INSTALL: advise to use release zips, remove upgrade.py, update Nginx (Walter Hop)
  • Java: change tag from COMMAND_INJECTION to JAVA_INJECTION (Manuel Spartan)
  • Jwall auditconsole outbound anomaly scoring requirements (Christoph Hansen)
  • Mark patterns not supported by re2 (Federico G. Schwindt)
  • Move duplicated 900270 to 900280 Fixes #1236. (Federico G. Schwindt)
  • Move PROXYLOCATION var (Franziska Bühler)
  • PHP: move get_defined_functions() and friends into PL1 (Walter Hop)
  • Pin the ftw version to 1.1.7 for now (Federico G. Schwindt)
  • Prevent bypass 933180 PHP Variable Function (Andrea Menin)
  • Reduce comments, introduction of triggered exploits (Franziska Bühler)
  • Remove all trailing spaces from ftw yaml test files (Ervin Hegedus)
  • Remove auditlog No other rules specify it. Add missing quotes and drop rev (Federico G. Schwindt)
  • Remove capture, remove tx.0, add transformation functions, fix regex, add presentation link (Andrea Menin)
  • Remove old and unwanted setvar constructs (Federico G. Schwindt)
  • Remove superfluous comments (Walter Hop)
  • Remove superfluous pmf (Federico G. Schwindt)
  • Remove t:lowercase from 920490 (Christian Folini)
  • Remove WARNING from php-errors.data (Andrea Menin)
  • Reorder actions (Federico G. Schwindt)
  • Replacing all @pmf with @pmFromFile (Christian Treutler)
  • Restricted-files.data: add AWS config (Walter Hop)
  • SQLI: removed unnecessary + (Christoph Hansen)
  • Switch Docker image to owasp/modsecurity:2.9-apache-ubuntu (Federico G. Schwindt)
  • unix-shell.data: fix typo in 'more' (Walter Hop)
  • Update .travis.yml Update to support v3.1 (Chaim Sanders)
  • Update dockerfile to always use 3.2/dev (Federico G. Schwindt)
  • Update OWASP CRS Docker image to support the new upstream and 2.9.3 (Peter Bittner, Chaim Sanders)
  • Update RESPONSE-950-DATA-LEAKAGES.conf (Christoph Hansen)
  • Update RESPONSE-959-BLOCKING-EVALUATION.conf (Christoph Hansen)
  • Wordpress: add support for Gutenberg editor (siric_, Walter Hop)
  • Wordpress: allow searching for any term in admin posts/pages overview (Walter Hop)
  • WordPress: exclude Gutenberg via rest_route (Walter Hop)
  • WordPress: exclude some more profile.php fields from RFI rule (Walter Hop)
  • WordPress: exclude SQL comment rule from _wp_http_referer (Walter Hop)
  • XML Soap Encoding fix 920240 (Christoph Hansen)

Unit tests:

  • 932140: add regression tests (Walter Hop)
  • 933180: fix tests which were doing nothing (Walter Hop)
  • 941370: add some more tests, fix whitespace (Walter Hop)
  • Add more tests for 941130 (Christian Folini)
  • Add regression test for 941101 (Avery Wong)
  • Add regression tests for 942150, 942100, 942260 (Christian Folini)
  • Add regression tests to 941160 (Franziska Bühler)
  • Add some regression tests (Ervin Hegedus)
  • Add testing support for libmodsecurity running on Apache and Nginx (Chaim Sanders)
  • Add tests for 941360 that fights JSFuck and Hieroglyphy (Christian Folini)
  • Add tests for rule 921110 (Yu Yagihashi)
  • Added regression tests for rules 942320, 942360, 942361, 942210, 942380, 942410, 942470, 942120, 942240, 942160, 942190, 942140, 942490, 942120 (Christoph Hansen)
  • Drop tests for removed rules (Federico G. Schwindt)
  • Fix failing regression tests (Ervin Hegedus)
  • Fix failing tests (Manuel Spartan, Chaim Sanders)
  • Fix readme typos in example rule (Walter Hop)
  • Fix test 941110-2 (Federico G. Schwindt)
  • Fix YAML 1.2 compliance with "true" (Federico G. Schwindt)
  • RCE: Add tests for the for command (Federico G. Schwindt)
  • Update regression tests for rules 931110, 931120, 931130 (Simon Studer)

Documentation:

  • Add details to README for Dockerhub (Franziska Bühler)
  • Add intro/comment to CVE comments (Franziska Bühler)
  • CONTRIBUTING: add note about separate PRs (Walter Hop)
  • Erased gitter chat. Added CII badge (Felipe Zipitria)
  • Replaced descriptions (Christian Folini)
  • Summarized authors on single line in tests for 941160 (Christian Folini)
  • Update broken link in regexp-assemble blog URLs (Walter Hop)
  • Update CONTRIBUTING.md To base changes on v3.2/dev. (Felipe Zipitría)
  • Update CONTRIBUTORS order (Andrea Menin)
  • Update README.md (Rufus125)
  • Updating crs site location (Chaim Sanders)

Version 3.1.1 - 2019-06-26

  • Fix CVE-2019-11387 ReDoS against CRS on ModSecurity 3 at PL 2 (Christoph Hansen, Federico G. Schwindt)
  • Content-Type made case insensitive in 920240, 920400 (Federico G. Schwindt)
  • Allow % encoding in 920240 (Christoph Hansen)
  • Fix bug in 920440 (Andrea Menin)
  • Fix bug in 920470 (Walter Hop)
  • Reduce false positives in 921110 (Yu Yagihashi, Federico G. Schwindt)
  • Fix bug in 943120 (XeroChen)

Version 3.1.0 - 2018-08-07

  • Add Detectify scanner (Andrea Menin)
  • Renaming matched_var/s (Victor Hora)
  • Remove lines with bare '#' comment char (Walter Hop)
  • Drop the XML variable from rule 932190 (Federico G. Schwindt)
  • Update outdated URLs (Walter Hop)
  • remove unused rule 901180 (Walter Hop)
  • Drop exit from unix and windows RCE (Federico G. Schwindt)
  • Fix anomaly_score counters (Federico G. Schwindt)
  • Remove mostly redundant 944220 in favor of 944240 (Christian Folini)
  • Add self[ and document[ to rule 941180 (Andrea Menin)
  • Provide proxy support within CRS docker image (Scott O'Neil)
  • Prevent bypass in rule 930120 PL3 (Andrea Menin)
  • Fix small typo in variable (Felipe Zipitría)
  • Fix bug #1166 in Docker image (Franziska Bühler)
  • Remove revision status from rules (Federico G. Schwindt)
  • Add template for issues (Federico G. Schwindt)
  • Correct failing travis tests in merge situations (Federico G. Schwindt)
  • Remove unused global variable in IIS rules (Chaim Sanders)
  • Refactor to use phase number instead of name (Federico G. Schwindt)
  • Add uploaded file name check; refresh LFI / filename checks (Walter Hop)
  • Introduce critical sibling of 920340 in PL2 (Walter Hop)
  • Fix bypass caused by multiple spaces in RCE rules (Walter Hop)
  • Remove unneeded regex capture groups (Federico G. Schwindt)
  • Add built-in exceptions for CPanel (Christoph Hansen)
  • Add additional file restrictios for ws_ftp, DS_Store... (Jose Nazario)
  • Fix missing strings in 942410 (Franziska Bühler)
  • Add 2 missing PDO errors (Christoph Hansen)
  • Fix issues with FPs in regression tests (Chaim Sanders)
  • Add Nextcloud client exclusion support (Christoph Hansen)
  • Fix spelling mistakes in REQUEST-942- (Padraig Doran, Chaim Sanders)
  • Explicitly ignore the user defined rules (Aaron Haaf, Chaim Sanders)
  • Add regression tests for 942490 (Christoph Hansen, Chaim Sanders)
  • Add Owncloud client exclusion support (Christoph Hansen, Christian Folini)
  • Adding 'F-Secure Radar' vulnerability scanner UA (Christian Folini, Chaim Sanders)
  • Update DockerFile to use Ubuntu as base (Chaim Sanders)
  • False positives 942360: move alter and union (Franziska Bühler, Chaim Sanders)
  • Add support for Java style attacks (Manuel Spartan, Walter Hop)
  • Fix various regression tests issues caused by webserver handling (azhao155, Chaim Sanders)
  • Update TravisCI to build on a per PR basis (Chaim Sanders)
  • Optimized rule 921160 and regex (Allan Boll, Chaim Sanders)
  • Update the consistency across various files (Federico G. Schwindt)
  • Add missing transform, 944120 sibling 944240 (Manuel Spartan)
  • Fix false positive for 'like' in 942120 (Walter Hop)
  • Add regression tests for Java Rules (Manuel Spartan)
  • Fixup and small reorg of dokuwiki rule exclusion package (Christian Folini)
  • Make TravisCI tests fail if Apache can't load rules (Felipe Zipitría)
  • Add exclusion rules for Dokuwiki (Matt Bagley, Christian Folini)
  • Initial exclusions for NextCloud installs (Matt Bagley, Christian Folini)
  • Added struts-pwn UA to list (Manuel Spartan)
  • Uses MULTIPART_MISSING_SEMICOLON instead of MULTIPART_SEMICOLON_MISSING (Felipe Zimmerle)
  • Add file upload checks (Manuel Spartan)
  • Check if Transfer-Encoding is missing (Federico G. Schwindt, Christian Folini)
  • Remove duplicated variables (Federico G. Schwindt)
  • Reduce FP by splitting classic SQL injection rule 942370 (Christoph Hansen)
  • Fix typo in REQUEST-920-PROTOCOL-ENFORCEMENT (ihacku, Franziska Bühler)
  • Add configurable timestamp format to FTW integration (Christian Folini)
  • Add badges to README (Felipe Zipitría)
  • Add clarifying comments to 910110 (Christian Folini)
  • Making rule 933131 case-insensitive (Manuel Spartan)
  • Merge and reorder rules as part of cleanup (Federico G. Schwindt)
  • Update copyright date and syntax (Jose Nazario, Felipe Zipitría)
  • Updated SecMarker and SkipAfter names to use meet guidelines (Felipe Zipitría)
  • Tidy up single quotes and other guidelines updates (Felipe Zipitría)
  • Syntax fix for setvar crs_exclusions_wordpress (Manuel Spartan)
  • Updated various contributors to developers (Christian Folini)
  • Revise SQL rules by disassembling them into their core protections (Franziska Bühler)
  • Add an example payload to 920220 (coolt)
  • Add a missing regex to rule 942310 (Franziska Bühler)
  • Detect GET or HEAD with Transfer-Encoding header (Federico G. Schwindt)
  • Fix broken links in references (Pásztor Gábor)
  • Add contributing guidelines (Felipe Zipitría)
  • Fix processing bypasses in rule 931130 (Felipe Zipitría, Christian Folini)
  • Correct small omissions in unix-shell.data (Walter Hop)
  • Add IIS specific detection to LFI-os-files.data (Manuel Spartan)
  • Update examples to match the current cleanup (Federico G. Schwindt)
  • Corrected the ordering of actions to meet guidelines (Felipe Zipitría)
  • Remove unused capture groups (Federico G. Schwindt)
  • Use explicit rx operator (Federico G. Schwindt)
  • Update the RCE regular expressions(Walter Hop, Federico G. Schwindt)
  • Removing maturity & accuracy from rules (Felipe Zipitría)
  • Increasing range header (Christoph Hansen)
  • Fixed upgrade.py script argument options (Glyn Mooney)
  • Updating to reflect OWASP flagship status (Chaim Sanders)
  • Adding Docker support for CRS (Chaim Sanders)
  • Initial Travis deployment (Zack Allen, Walter Hop)
  • Initial commit of regression tests (Chaim Sanders, Walter Hop)
  • Remove test for 921170 because it won't ever fire (Chaim Sanders, Walter Hop)
  • Update minor incorrectness in asp.net regex (Chaim Sanders, Walter Hop)
  • Add notification for builds against #modsecurity on freenode (Zack Allen, Walter Hop)
  • Add all past code contributors and convert to markdown (Walter Hop)
  • Block uploads of files with .phps extension (Walter Hop)
  • Improve message for script upload with superfluous extension (Walter Hop)
  • Remove trailing whitespace in various regexs (Walter Hop)
  • Add command popd to direct unix rce list in rule 932150 (Franziska Bühler)
  • Remove unnecessary END_XSS_CHECKS marker (Christian Folini)
  • Ignore Whitespaces in Rule 942110 (Christoph Hansen)
  • Update missing RCE Commands (Umar Farook)
  • Update lfi-os-files.data (Umar Farook)
  • Removed deprecated t:removeComments from 942100 (Christian Folini)
  • Add word boundary to rule 942410 (Franziska Bühler)

Version 3.0.2 - 2017-05-12

  • Remove debug rule that popped up in 3.0.1 (Christian Folini)

Version 3.0.1 - 2017-05-09

  • SECURITY: Removed insecure handling of X-Forwarded-For header; reported by Christoph Hansen (Walter Hop)
  • Fixed documentation errors in RESPONSE-999-... (Chaim Sanders)
  • Reduced FPs on 942190 by adding a word boundary to regex (Franziska Bühler)
  • Reduced FPs on 932150 by removing keyword reset (Franziska Bühler)
  • Tidied exceptions in 930100 (Roberto Paprocki)
  • Reduced FPs for 920120 by splitting into stricter sibling (Franziska Bühler)
  • Simplified some Drupal rule exclusions (Damien McKenna, Christian Folini)
  • Extended KNOWN_BUGS with remarks on JSON support on Debian (Franziska Bühler)
  • Updated README to add gitter support (Chaim Sanders)
  • Clarified DoS documentation for static extensions (Roberto Paprocki)
  • Added application/octet-stream to allowed content types (Christian Folini)
  • Typo in 942220 alert message (Chaim Sanders, @bossloper)
  • Moved referrer check of 941100 into new PL2 rule (Franziska Bühler)
  • Closed multiple @pmf evasions via lowercase transformation (Roberto Paprocki)
  • Clarified libinjection bundling in INSTALL file (@cjdp)
  • Reduced FPs via Wordpress Rule Exclusions (Walter Hop)
  • Support for RFC 3902 (Content Type application/soap+xml; Christoph Hansen) Make sure you update ModSecurity recommended rule 200000 as well.
  • Bugfix in 942410 regex (Christian Folini)
  • Reduced FPs for 942360 (Walter Hop)
  • Reduced FPs for 941120 by restricting event handler names (Franziska Bühler)
  • Extended 931000 with scheme "file" to fix false negative (Federico Schwindt)
  • Extended 905100 and 905110 for HTTP/2.0 (includes bugfix, Christoph Hansen)
  • Moved 941150 from PL1 to PL2; includes Bugfix for rule (Christian Folini)
  • Updated documentation for 920260 (Chaim Sanders)
  • Bugfix in upgrade.py (Victor Hora)
  • Fixed FP in RCE rule 932140 (Walter Hop)
  • Fixed comment for arg limit check rule 920370 (Christian Folini)
  • Created CONTRIBUTORS file
  • Added Christoph Hansen (emphazer) to CONTRIBUTORS file
  • Added Franziska Bühler (Franziska Bühler) to CONTRIBUTORS file
  • Fixed bug with DoS rule 912160 (@loudly-soft, Christian Folini)

Version 3.0.0 - 2016-11-10

Huge changeset running in separate branch from September 2013 to September 2016. This is a cursory summary of the most important changes:

  • Huge reduction of false positives (Ryan Barnett, Felipe Zimmerle, Chaim Sanders, Walter Hop, Christian Folini)
  • Anomaly scoring is the new default, renamed thresholds from tx.(in|out)bound_anomaly_score_level to tx.(in|out)bound_anomaly_score_threshold
  • Introduction of libinjection for SQLi detection
  • Introduction of libinjection for XSS detection
  • Big improvement on detection of Remote Command Execution (Walter Hop)
  • Big improvement on PHP function name detection (Walter Hop)
  • Paranoia Mode (Christian Folini, Noël Zindel, Franziska Bühler, Manuel Leos, Walter Hop)
  • Shifted dozens of rules into higher paranoia levels
  • Introduced a lot of stricter sibling rules in higher levels
  • Generic mechanism to support application specific rule exclusions (Chaim Sanders)
  • Initial Wordpress rule exclusions (Walter Hop)
  • Initial Drupal rule exclusions (Christian Folini, @emphazer)
  • Renumbering of rules. See folder id_renumbering for a csv map (Chaim Sanders)
  • Consolidation of rules, namely XSS and SQLi (Spider Labs/Trustwave team)
  • Sampling mode / Easing in (Christian Folini)
  • Cleanup of reputation checks / persistent blocking (Christian Folini / Walter Hop)
  • Tags much more systematic (Walter Hop)
  • IP reputation checks / persistent blocking of certain clients (Spider Labs/Trustwave team)
  • Phase actions use request/response/logging now instead of numerical phases (Spider Labs/Trustwave team)
  • Added NoScript XSS Filters (Spider Labs/Trustwave team)
  • Updated "severity" action to use words (CRITICAL, WARNING, etc...) vs. numbers (5, 4, etc..)
  • Various regex fixes after research by Vladimir Ivanov (Chaim Sanders)
  • Overhaul of the regression mode into debug mode (Walter Hop, Ryan Barnett)
  • Introduction of util/upgrade.py (Walter Hop)
  • Removal of GeoIP database. Download via util/upgrade.py now.
  • Introduction of Initialization rules with default values (Walter Hop, Christian Folini)
  • Sorting out terminology with whitelisting and rule exclusions (Christian Folini)
  • Overhaul of testing (Chaim Sanders)
  • Protection from HTTP Parameter Pollution (Franziska Bühler)
  • Simplification of setup config file, renamed file to crs-setup.conf.example
  • Improved session fixation detection logic (Christian Peron, credits to Eric Hodel for the discovery)
  • Updated list of malicious webscanners
  • Splitting scanner user agents data files (github user @ygrek)
  • Countless bugfixes in severities, anomaly scores, tags, etc. across the board
  • Cleanup of formerly experimental DDoS rules, fix documentation (Ryan Barnett, Christian Folini)
  • Improves http blacklist checks (Walter Hop)
  • Extended XSS detection (as suggested by Mazin Ahmed)
  • Added support for Travis CI
  • Added support for HTTP/2 in recent Apache 2.4 (Walter Hop)
  • Added many, many bots and scanners (among others suggested by github user @toby78, @jamuse, Matt Koch)
  • Fixed mime types suitable for XML processor (Chaim Sanders)
  • Include script in util/join-multiline-rules to work around Apache 2.4 < 2.4.11 bug with long lines (Walter Hop)
  • New detection for request smuggling attacks (Achim Hofmann, Christian Folini)
  • Fixes with project honeypot setup (Ryan Barnett)
  • Separated DB / SQL messages by DB software (Ryan Barnett)
  • CPanel integration (Chaim Sanders)
  • Introduction of var for static resources (Chaim Sanders)
  • Many improvements to rules in 2014/5 (Ryan Barnett)

Version 2.2.9 - 2013-09-30

Improvements:

  • Updated the /util directory structure

Bug Fixes:

Version 2.2.8 - 2013-06-30

Improvements:

Bug Fixes:

Version 2.2.7 - 2012-12-19

Improvements:

Bug Fixes:

Version 2.2.6 - 2012-09-14

Improvements:

  • Started rule formatting update for better readability
  • Added maturity and accuracy action data to each rule
  • Updated rule revision (rev) action
  • Added rule version (ver) action
  • Added more regression tests (util/regression_tests/)
  • Modified Rule ID 960342 to block large file attachments in phase:1
  • Removed all PARANOID rule checks
  • Added new Session Fixation rules

Bug Fixes:

Version 2.2.5 - 2012-06-14

Security Fixes:

Improvements:

  • Renamed main config file to modsecurity_crs_10_setup.conf
  • Updated the rule IDs to start from CRS reserved range: 900000
  • Updated rule formatting for readability
  • Updated the CSRF rules to use UNIQUE_ID as the token source
  • Added the zap2modsec.pl script to the /util directory which converts OWASP ZAP Scanner XML data into ModSecurity Virtual Patches
  • Updated the Directory Traversal Signatures to include more obfuscated data
  • Added Arachni Scanner Integration Lua script/rules files

Bug Fixes:

  • Added forceRequestBodyVariable action to rule ID 960904

Version 2.2.4 - 2012-03-14

Improvements:

  • Added Location and Set-Cookie checks to Response Splitting rule ID 950910
  • Added a README file to the activated_rules directory
  • Consolidate a number of SQL Injection rules into optimized regexs
  • Removed multiMatch and replaceComments from SQL Injection rules
  • Updated the SQLi regexs for greediness
  • Updated the SQLi setvar anomaly score values to use macro expansion
  • Removed PARANOID mode rules

Bug Fixes:

  • Fixed missing comma before severity action in rules 958291, 958230 and 958231
  • Fixed duplidate rule IDs

Version 2.2.3 - 2011-12-19

Improvements:

Bug Fixes:

  • Fixed Content-Type evasion issue by adding ctl:forceRequestBodyVariable action to rule ID 960010. (Identified by Andrew Wilson of Trustwave SpiderLabs).
  • Updated the regex and added tags for RFI rules.

Version 2.2.2 - 2011-09-28

Improvements:

  • Updated the AppSensor Profiling (to use Lua scripts) for Request Exceptions Detection Points
  • Added new Range header detection checks to prevent Apache DoS
  • Added new Security Scanner User-Agent strings
  • Added example script to the /util directory to convert Arachni DAST scanner XML data into ModSecurity virtual patching rules.
  • Updated the SQLi Character Anomaly Detection Rules
  • Added Host header info to the RESOURCE collection key for AppSensor profiling rules

Bug Fixes:

  • Fixed action list for XSS rules (replaced pass,nolog,auditlog with block)
  • Fixed Request Limit rules by removing & from variables
  • Fixed Session Hijacking IP/UA hash captures
  • Updated the SQLi regex for rule ID 981242

Version 2.2.1 - 2011-07-20

Improvements:

  • Extensive SQL Injection signature updates as a result of the SQLi Challenge http://www.modsecurity.org/demo/challenge.html
  • Updated the SQL Error message detection in response bodies
  • Updated SQL Injection signatures to include more DB functions
  • Updated the WEAK SQL Injection signatures
  • Added tag AppSensor/RE8 to rule ID 960018

Bug Fixes:

  • Fixed Bad Robot logic for rule ID 990012 to further qualify User-Agent matches https://www.modsecurity.org/tracker/browse/CORERULES-70
  • Fixed Session Hijacking rules to properly capture IP address network hashes.
  • Added the multiMatch action to the SQLi rules
  • Fixed a false negative logic flaw within the advanced_filter_converter.lua script
  • Fixed missing : in id action in DoS ruleset.
  • Updated rule ID 971150 signature to remove ;

Version 2.2.0 - 2011-05-26

Improvements:

Bug Fixes:

  • Assigned IDs to all active SecRules/SecActions
  • Removed rule inversion (!) from rule ID 960902
  • Fixed false negative issue in Response Splitting Rule
  • Fixed false negative issue with @validateByteRange check
  • Updated the TARGETS listing for rule ID 950908
  • Updated TX data for REQBODY processing
  • Changed the pass action to block in the RFI rules in the 40 generic file
  • Updated RFI regex to catch IP address usage in hostname https://www.modsecurity.org/tracker/browse/CORERULES-68
  • Changed REQUEST_URI_RAW variable to REQUEST_LINE in SLR rules to allow matches on request methods.
  • Updated the RFI rules in the 40 generic attacks conf file to remove explicit logging actions. They will now inherit the settings from the SecDefaultAction

Version 2.1.2 - 2011-02-17

Improvements:

  • Added experimental real-time application profiling ruleset.
  • Added experimental Lua script for profiling the # of page scripts, iframes, etc.. which will help to identify successful XSS attacks and planting of malware links.
  • Added new CSRF detection rule which will trigger if a subsequent request comes too quickly (need to use the Ignore Static Content rules).

Bug Fixes:

  • Added missing " in the skipAfter SecAction in the CC Detection rule set

Version 2.1.1 - 2010-12-30

Bug Fixes:

  • Updated the 10 config conf file to add in pass action to User-Agent rule
  • Updated the CSRF ruleset to conditionally do content injection - if the csrf token was created by the session hijacking conf file
  • Updated the session hijacking conf file to only enforce rules if a SessionID Cookie was submitted
  • Fixed macro expansion setvar bug in the restricted file extension rule
  • Moved the comment spam data file into the optional_rules directory

Version 2.1.0 - 2010-12-29

Improvements:

  • Added Experimental Lua Converter script to normalize payloads. Based on PHPIDS Converter code and it used with the advanced filters conf file.
  • Changed the name of PHPIDS converted rules to Advanced Filters
  • Added Ignore Static Content (Performance enhancement) rule set
  • Added XML Enabler (Web Services) rule set which will parse XML data
  • Added Authorized Vulnerability Scanning (AVS) Whitelist rule set
  • Added Denial of Service (DoS) Protection rule set
  • Added Slow HTTP DoS (Connection Consumption) Protection rule set
  • Added Brute Force Attack Protection rule set
  • Added Session Hijacking Detection rule set
  • Added Username Tracking rule set
  • Added Authentication Tracking rule set
  • Added Anti-Virus Scanning of File Attachments rule set
  • Added AV Scanning program to /util directory
  • Added Credit Card Usage Tracking/Leakage Prevention rule set
  • Added experimental CC Track/PAN Leakage Prevention rule set
  • Added an experimental_rules directory to hold new BETA rules
  • Moved the local exceptions conf file back into base_rules directory however it has a ".example" extension to prevent overwriting customized versions when upgrading
  • Separated out HTTP Parameter Pollution and Restricted Character Anomaly Detection rules to the experimental_rules directory
  • Adding the REQUEST_HEADERS:User-Agent macro data to the initcol in 10 config file, which will help to make collections a bit more unique

Version 2.0.10 - 2010-11-29

Improvements:

  • Commented out the Anomaly Scoring Blocking Mode TX variable since, by default, the CRS is running in traditional mode.

Bug Fixes:

Version 2.0.9 - 2010-11-17

Improvements:

  • Changed the name of the main config file to modsecurity_crs_10_config.conf.example so that it will not overwrite existing config settings. Users should rename this file to activate it.
  • Traditional detection mode is now the current default
  • Users can now more easily toggle between traditional/standard mode vs. anomaly scoring mode by editing the modsecurity_crs_10_config.conf file
  • Updated the disruptive actions in most rules to use "block" action instead of "pass". This is to allow for the toggling between traditional vs. anomaly scoring modes.
  • Removed logging actions from most rules so that it can be controlled from the SecDefaultAction setting in the modsecurity_crs_10_config.conf file
  • Updated the anomaly scores in the modsecurity_crs_10_config.conf file to more closely match what is used in the PHPIDS rules. These still have the same factor of severity even though the numbers themselves are smaller.
  • Updated the 49 and 59 blocking rules to include the matched logdata
  • Updated the TAG data to further classify attack/vuln categories.
  • Updated the SQL Injection filters to detect more boolean logic attacks
  • Moved some files to optional_rules directory (phpids, Emerging Threats rules)

Bug Fixes:

Version 2.0.8 - 2010-08-27

Improvements:

  • Updated the PHPIDS filters
  • Updated the SQL Injection filters to detect boolean attacks (1<2, foo == bar, etc..)
  • Updated the SQL Injection filters to account for different quotes
  • Added UTF-8 encoding validation support to the modsecurity_crs_10_config.conf file
  • Added Rule ID 950109 to detect multiple URL encodings
  • Added two experimental rules to detect anomalous use of special characters

Bug Fixes:

Version 2.0.7 - 2010-06-04

Improvements:

  • Added CSRF Protection Ruleset which will use Content Injection to add javascript to specific outbound data and then validate the csrf token on subsequent requests.
  • Added new Application Defect Ruleset which will identify/fix missing HTTPOnly cookie flags
  • Added Experimental XSS/Missing Output Escaping Ruleset which looks for user supplied data being echoed back to user unchanged.
  • Added rules-updater.pl script and configuration file to allow users to automatically download CRS rules from the CRS rules repository.
  • Added new SQLi keyword for ciel() and reverse() functions.
  • Updated the PHPIDS filters

Bug Fixes:

Version 2.0.6 - 2010-02-26

Bug Fixes:

Version 2.0.5 - 2010-02-01

Improvements:

  • Removed previous 10 config files as they may conflict with local customized Mod configs.
  • Added a new 10 config file that allows the user to globally set TX variables to turn on/off PARANOID_MODE inspection, set anomaly score levels and http policies. Must have ModSecurity 2.5.12 to use the macro expansion in numeric operators.
  • Added Rule Logic and Reference links to rules descriptions.
  • Added Rule IDs to all rules.
  • Added tag data mapping to new OWASP Top 10 and AppSensor Projects, WASC Threat Classification
  • Removed Apache limit directives from the 23 file
  • Added macro expansion to 23 file checks.
  • Added @pmFromFile check to 35 bad robots file
  • Added malicious UA strings to 35 bad robots check
  • Created an experimental rules file
  • Updated HTTP Parameter Pollution (HPP) rule logic to concat data into a TX variable for inspection
  • Removed TX inspections for generic attacks and reverted to standard ARGS inspection https://www.modsecurity.org/tracker/browse/MODSEC-120
  • Updated the variable list for standard inspections (ARGS|ARGS_NAMES|XML:/*) and moved the other variables to the PARANOID list (REQUEST_URI|REQUEST_BODY|REQUEST_HEADERS|TX:HPP_DATA)
  • Moved converted ET Snort rules to the /optional_rules directory
  • Created a new Header Tagging ruleset (optional_rules) that will add matched rule data to the request headers.
  • Updated Inbound blocking conf file to use macro expansion from the 10 config file settings
  • Added separate anomaly scores for inbound, outbound and total to be evaluated for blocking.
  • Updated the regex logic in the (1=1) rule to factor in quotes and other logical operators.
  • Updated the SPAMMER RBL check rules logic to only check once per IP/Day.
  • Added new outbound malware link detection rules.
  • Added PHP "call_user_func" to blacklist Identified by SOGETI ESEC R&D

Bug Fixes:

Version 2.0.4 - 2009-11-30

Improvements:

  • Updated converted PHPIDS signatures (https://svn.php-ids.org/svn/trunk/lib/IDS/default_filter.xml)
  • Updated PHPIDS rules logic to first search for payloads in ARGS and then if there is no match found then search more generically in request_body|request_uri_raw
  • Updated PHPIDS rules logic to only set TX variables and to not log. This allows for more clean exceptions in the 48 file which can then expire/delete false positive TX matches and adjust the anomaly scores. These rules will then inspect for any TX variables in phase:5 and create appropriate alerts for any variable matches that exist.

Bug Fixes:

  • Added Anomaly Score check to the 60 correlation file to recheck the anomaly score at the end of phase:4 which would allow for blocking based on information leakage issues.

Version 2.0.3 - 2009-11-05

Improvements:

Bug Fixes:

Version 2.0.2 - 2009-09-11

Improvements:

Bug Fixes:

Version 2.0.1 - 2009-08-07

Improvements:

Bug Fixes:

Version 2.0.0 - 2009-07-29

New Rules & Features:

  • Fine Grained Policy The rules have been split to having one signature per rule instead of having all signatures combined into one optimized regular expression. This should allow you to modify/disable events based on specific patterns instead of having to deal with the whole rule.
  • Converted Snort Rules Emerging Threat web attack rules have been converted. http://www.emergingthreats.net/
  • Anomaly Scoring Mode Option The rules have been updated to include anomaly scoring variables which allow you to evaluate the score at the end of phase:2 and phase:5 and decide on what logging and disruptive actions to take based on the score.
  • Correlated Events There are rules in phase:5 that will provide some correlation between inbound events and outbound events and will provide a result of successful atttack or attempted attack.
  • Updated Severity Ratings The severity ratings in the rules have been updated to the following:
    • 0: Emergency - is generated from correlation where there is an inbound attack and an outbound leakage.
    • 1: Alert - is generated from correlation where there is an inbound attack and an outbound application level error.
    • 2: Critical - is the highest severity level possible without correlation. It is normally generated by the web attack rules (40 level files).
    • 3: Error - is generated mostly from outbound leakabe rules (50 level files).
    • 4: Warning - is generated by malicious client rules (35 level files).
    • 5: Notice - is generated by the Protocol policy and anomaly files.
    • 6: Info - is generated by the search engine clients (55 marketing file).
  • Updated Comment SPAM Protections Updated rules to include RBL lookups and client fingerprinting concepts from Bad Behavior (www.bad-behavior.ioerror.us)
  • Creation of Global Collection Automatically create a Global collection in the 10 config file. Other rules can then access it.
  • Use of Block Action Updated the rules to use the "block" action. This allows the Admin to globally set the desired block action once with SecDefaultAction in the 10 config file rather than having to edit the disruptive actions in all of the rules or for the need to have multiple versions of the rules (blocking vs. non-blocking).
  • "Possible HTTP Parameter Pollution Attack: Multiple Parameters with the same Name." http://tacticalwebappsec.blogspot.com/2009/05/http-parameter-pollution.html
  • Added new generic RFI detection rules. http://tacticalwebappsec.blogspot.com/2009/06/generic-remote-file-inclusion-attack.html
  • "Possibly malicious iframe tag in output" (Rules 981001,981002) Planting invisible iframes in a site can be used by attackers to point users from the victim site to their malicious site. This is actually as if the user was visiting the attacker's site himself, causing the user's browser to process the content in the attacker's site.

New Events:

  • Rule 960019 - Expect Header Not Allowed.
  • Rule 960020 - Pragma Header Requires Cache-Control Header
  • Rule 958290 - Invalid Character in Request - Browsers should not send the (#) character as it is reserved for use as a fragment identifier within the html page.
  • Rule 958291 - Range: field exists and begins with 0.
  • Rule 958292 - Invalid Request Header Found.
  • Rule 958293 - Lowercase Via Request Header Found.
  • Rule 958294 - Common SPAM Proxies found in Via Request Header.
  • Rule 958295 - Multiple/Conflicting Connection Header Data Found.
  • Rule 958296 - Request Indicates a SPAM client accessed the Site.
  • Rule 958297 - Common SPAM/Email Harvester crawler.
  • Rule 958298 - Common SPAM/Email Harvester crawler

Bug Fixes:

  • Rule 950107 - Split the rule into 2 separate rules to factor in the Content-Type when inspecting the REQUEST_BODY variable.
  • Rule 960017 - Bug fix for when having port in the host header.
  • Rule 960014 - Bug fix to correlate the SERVER_NAME variable.
  • Rule 950801 - Increased the logic so that the rule will only run if the web site uses UTF-8 Encoding.
  • Rules 999210,999211 - Bug fix to move ctl actions to last rule, add OPTIONS and allow the IPv6 loopback address
  • Rule 950117 - Updated the RFI logic to factor in both a trailing "?" in the ARG and to identify offsite hosts by comparing the ARG URI to the Host header. Due to this rule now being stronger, moved it from optional tight security rule to 40 generic attacks file.

Other Fixes:

  • Added more HTTP Protocol violations to 20 file.
  • Set the SecDefaultAction in the 10 config file to log/pass (This was the default setting, however this sets it explicitly.
  • Added SecResponseBodyLimitAction ProcessPartial to the 10 config file. This was added so that when running the SecRuleEngine in DetectionOnly mode, it will not deny response bodies that go over the size restrictions.
  • Changed SecServerSignature to "Apache/1.3.28"
  • Fixed the use of SkipAfter and SecMarkers to make it consistent. Now have BEGIN and END SecMarkers for rule groups to more accurately allow moving to proper locations.
  • Fixed the @pm/@pmFromFile pre-qualifier logic to allow for operator inversion. This removes the need for some SecAction/SkipAfter rules.
  • Updated rule formatting to easily show rule containers (SecMarkers, pre-qualifier rules and chained rules).

Version 1.6.1 - 2008-04-22

  • Fixed a bug where phases and transformations where not specified explicitly in rules. The issue affected a significant number of rules, and we strongly recommend to upgrade.

Version 1.6.0 - 2008-02-19

New Rulesets & Features:

  • 42 - Tight Security This ruleset contains currently 2 rules which are considered highly prone to FPs. They take care of Path Traversal attacks, and RFI attacks. This ruleset is included in the optional_rulesets dir
  • 42 - Comment Spam Comment Spam is used by the spammers to increase their rating in search engines by posting links to their site in other sites that allow posting of comments and messages. The rules in this ruleset will work against that. (Requires ModSecurity 2.5)
  • Tags A single type of attack is often detected by multiple rules. The new alert classification tags solve this issue by providing an alternative alert type indication and can serve for filtering and analysis of audit logs. The classification tags are hierarchical with slashes separating levels. Usually there are two levels with the top level describing the alert group and the lower level denoting the alert type itself, for example: WEB_ATTACK/SQL_INJECTION.

False Positives Fixes:

  • Rule 960903 - Moved to phase 4 instead of 5 to avoid FPs
  • Rule 950107 - Will look for invalid url decoding in variables that are not automatically url decoded

Additional rules logic:

  • Using the new "logdata" action for logging the matched signature in rules
  • When logging an event once, init the collection only if the alert needs to log
  • Using the new operator @pm as a qualifier before large rules to enhance performance (Requires ModSecurity 2.5)
  • SQL injection - A smarter regexp is used to detect 1=1,2=2,etc.. and not only 1=1. (Thanks to Marc Stern for the idea)
  • New XSS signatures - iframe & flash XSS

Version 1.5.1 - 2007-12-06

False Positives Fixes:

  • Protocol Anomalies (file 21) - exception for Apache SSL pinger (Request: GET /)

New Events:

  • 960019 - Detect HTTP/0.9 Requests HTTP/0.9 request are not common these days. This rule will log by default, and block in the blocking version of file 21

Other Fixes:

  • File 40, Rules 950004,950005 - Repaired the correction for the double url decoding problem
  • File 55 contained empty regular expressions. Fixed.

Version 1.5 - 2007-11-23

New Rulesets:

  • 23 - Request Limits "Judging by appearances". This rulesets contains rules blocking based on the size of the request, for example, a request with too many arguments will be denied.

Default policy changes:

  • XML protection off by default
  • BLOCKING dir renamed to optional_rules
  • Ruleset 55 (marketing) is now optional (added to the optional_rules dir)
  • Ruleset 21 - The exception for apache internal monitor will not log anymore

New Events:

  • 960912 - Invalid request body Malformed content will not be parsed by modsecurity, but still there might be applications that will parse it, ignoring the errors.
  • 960913 - Invalid Request Will trigger a security event when request was rejected by apache with code 400, without going through ModSecurity rules.

Additional rules logic:

  • 950001 - New signature: delete from
  • 950007 - New signature: waitfor delay

False Positives Fixes:

  • 950006 - Will not be looking for /cc pattern in User-Agent header
  • 950002 - "Internet Explorer" signature removed
  • Double decoding bug used to cause FPs. Some of the parameters are already url-decoded by apache. This caused FPs when the rule performed another url-decoding transformation. The rules have been split so that parameters already decoded by apache will not be decoded by the rules anymore.
  • 960911 - Expression is much more permissive now
  • 950801 - Commented out entirely. NOTE: If your system uses UTF8 encoding, then you should uncomment this rule (in file 20)

version 1.4.3 - 2007-07-21

New Events:

  • 950012 - HTTP Request Smuggling For more info on this attack: http://www.cgisecurity.com/lib/HTTP-Request-Smuggling.pdf
  • 960912 - Invalid request body Malformed content will not be parsed by modsecurity, but still there might be applications that will parse it, ignoring the errors.
  • 960913 - Invalid Request Will trigger a security event when request was rejected by apache with code 400, without going through ModSecurity rules.

False Positives Fixes:

  • 950107 - Will allow a % sign in the middle of a string as well
  • 960911 - A more accurate expression based on the rfc: http://www.ietf.org/rfc/rfc2396.txt
  • 950015 - Will not look for http/ pattern in the request headers

Additional rules logic:

  • Since Apache applies scope directives only after ModSecurity phase 1 this directives cannot be used to exclude phase 1 rules. Therefore we moved all inspection rules to phase 2.

version 1.4 build 2 - 2007-05-17

New Feature:

  • Search for signatures in XML content XML Content will be parsed and ispected for signatures

New Events:

  • 950116 - Unicode Full/Half Width Abuse Attack Attempt Full-width unicode can by used to bypass content inspection. Such encoding will be forbidden http://www.kb.cert.org/vuls/id/739224
  • 960911 - Invalid HTTP request line Enforce request line to be valid, i.e.:
  • 960904 - Request Missing Content-Type (when there is content) When a request contains content, the content-type must be specified. If not, the content will not be inspected
  • 970018 - IIS installed in default location (any drive) Log once if IIS in installed in the /Inetpub directory (on any drive, not only C)
  • 950019 - Email Injection Web forms used for sending mail (such as "tell a friend") are often manipulated by spammers for sending anonymous emails

Regular expressions fixes:

  • Further optimization of some regular expressions (using the non-greediness operator) The non-greediness operator, <?>, prevents excessive backtracking

FP fixes:

  • Rule 950107 - Will allow a parameter to end in a % sign from now on

version 1.4 - 2007-05-02

New Events:

  • 970021 - WebLogic information disclosure Matching of "<title>JSP compile error</title>" in the response body, will trigger this rule, with severity 4 (Warning)
  • 950015,950910,950911 - HTTP Response Splitting Looking for HTTP Response Splitting patterns as described in Amit Klein's excellent white paper: http://www.packetstormsecurity.org/papers/general/whitepaper_httpresponse.pdf ModSecurity does not support compressed content at the moment. Thus, the following rules have been added:
  • 960902 - Content-Encoding in request not supported Any incoming compressed request will be denied
  • 960903 - Content-Encoding in response not supported An outgoing compressed response will be logged to alert, but ONLY ONCE.

False Positives Fixes:

  • Removed <.exe>,<.shtml> from restricted extensions
  • Will not be looking for SQL Injection signatures <root@>, in the Via request header
  • Excluded Referer header from SQL injection, XSS and command injection rules
  • Excluded X-OS-Prefs header from command injection rule
  • Will be looking for command injection signatures in REQUEST_COOKIES|REQUEST_COOKIES_NAMES instead of REQUEST_HEADERS:Cookie.
  • Allowing charset specification in the <application/x-www-form-urlencoded> Content-Type

Additional rules logic:

  • Corrected match of OPTIONS method in event 960015
  • Changed location for event 960014 (proxy access) to REQUEST_URI_RAW
  • Moved all rules apart from method inspection from phase 1 to phase 2 - This will enable viewing content if such a rule triggers as well as setting exceptions using Apache scope tags.
  • Added match for double quote in addition to single quote for signature (SQL Injection)
  • Added 1=1 signature (SQL Injection)

version 1.3.2 build 4 2007-01-17

Fixed apache 2.4 dummy requests exclusion Added persistent PDF UXSS detection rule

Version 1.3.2 build 3 2007-01-10

Fixed regular expression in rule 960010 (file #30) to allow multipart form data content

Version 1.3.2 - 2006-12-27

New events:

  • 960037 Directory is restricted by policy
  • 960038 HTTP header is restricted by policy

Regular expressions fixes:

  • Regular expressions with @ at end of beginning (for example "@import)
  • Regular expressions with un-escaped "."
  • Command Injections now always require certain characters both before and after the command. Important since many are common English words (finger, mail)
  • The command injection wget is not searched in the UA header as it has different meaning there.
  • LDAP Fixed to reduce FPs:
    • More accurate regular expressions
    • high bit characters not accepted between signature tokens.
  • Do not detect <?xml as a PHP tag in both PHP injection and PHP source leakage
  • Removed Java from automation UA
  • When validating encoding, added regexp based chained rule that accepts both %xx and %uxxxxx encoding bypassing a limitation of "@validateUrlEncoding"

Additional rules logic:

  • Checks for empty headers in addition to missing ones (Host, Accept and User-Agent)
  • OPTIONS method does not require an accept header.
  • Apache keep alive request exception.
  • PROPFIND and OPTIONS can be used without content-encoding (like HEAD and GET)
  • Validate byte range checks by default only that no NULL char exists.
  • Added CSS to allowed extensions in strict rule sets.
  • Changed default action in file #50 to pass instead of deny.
  • Moved IP host header from protocol violations to protocol anomalies.

Modified descriptions:

  • 950107: URL Encoding Abuse Attack Attempt
  • 950801: UTF8 Encoding Abuse Attack Attempt
  • Added matched pattern in many events using capture and %{TX.0}
  • Added ctl:auditLogParts=+E for outbound events and attacks to collect response.

Version 1.2 - 2006-11-19

Changes:

  • Move all events to the range of events allocated to Thinking Stone, now Breach by prefixing all event IDs with "9".
  • Reverse severities to follow the Syslog format used by ModSecurity, now 1 is the highest and 5 the lowest.

Bug fixes:

  • Removed quotes from list of mime types inspected on exit (directive SecResponseBodyMimeType)
  • Corrected "cd .." signature. Now the periods are escaped.
  • Too many FPs with events 950903 & 950905. Commented them out until fixed.

Version 1.1 - 2006-10-18

Initial version