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Maliciously crafted Git server replies can lead to path traversal and RCE on go-git clients

Critical severity GitHub Reviewed Published Jan 9, 2024 in go-git/go-git • Updated Jan 23, 2024

Package

gomod github.com/go-git/go-git/v4 (Go)

Affected versions

>= 4.0.0, <= 4.13.1

Patched versions

None
gomod github.com/go-git/go-git/v5 (Go)
>= 5.0.0, < 5.11.0
5.11.0
gomod gopkg.in/src-d/go-git.v4 (Go)
>= 4.7.1
None

Description

Impact

A path traversal vulnerability was discovered in go-git versions prior to v5.11. This vulnerability allows an attacker to create and amend files across the filesystem. In the worse case scenario, remote code execution could be achieved.

Applications are only affected if they are using the ChrootOS, which is the default when using "Plain" versions of Open and Clone funcs (e.g. PlainClone). Applications using BoundOS or in-memory filesystems are not affected by this issue.
This is a go-git implementation issue and does not affect the upstream git cli.

Patches

Users running versions of go-git from v4 and above are recommended to upgrade to v5.11 in order to mitigate this vulnerability.

Workarounds

In cases where a bump to the latest version of go-git is not possible in a timely manner, we recommend limiting its use to only trust-worthy Git servers.

Credit

Thanks to Ionut Lalu for responsibly disclosing this vulnerability to us.

References

@mcuadros mcuadros published to go-git/go-git Jan 9, 2024
Published to the GitHub Advisory Database Jan 10, 2024
Reviewed Jan 10, 2024
Published by the National Vulnerability Database Jan 12, 2024
Last updated Jan 23, 2024

Severity

Critical

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
None
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:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.231%
(62nd percentile)

Weaknesses

CVE ID

CVE-2023-49569

GHSA ID

GHSA-449p-3h89-pw88

Source code

Credits

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