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Composer Remote Code Execution vulnerability via web-accessible composer.phar

High severity GitHub Reviewed Published Sep 29, 2023 in composer/composer • Updated Mar 27, 2024

Package

composer composer/composer (Composer)

Affected versions

< 1.10.27
>= 2.0.0, < 2.2.22
>= 2.3.0, < 2.6.4

Patched versions

1.10.27
2.2.22
2.6.4

Description

Impact

Users publishing a composer.phar to a public web-accessible server where the composer.phar can be executed as a php file may be impacted if PHP also has register_argc_argv enabled in php.ini.

Patches

2.6.4, 2.2.22 and 1.10.27 patch this vulnerability.

Workarounds

Make sure register_argc_argv is disabled in php.ini, and avoid publishing composer.phar to the web as this really should not happen.

References

@Seldaek Seldaek published to composer/composer Sep 29, 2023
Published by the National Vulnerability Database Sep 29, 2023
Published to the GitHub Advisory Database Sep 29, 2023
Reviewed Sep 29, 2023
Last updated Mar 27, 2024

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

1.134%
(85th percentile)

Weaknesses

CVE ID

CVE-2023-43655

GHSA ID

GHSA-jm6m-4632-36hf

Source code

Credits

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