CVE-2021-21237 Information

Description

Git LFS is a command line extension for managing large files with Git. On Windows if Git LFS operates on a malicious repository with a git.bat or git.exe file in the current directory that program would be executed permitting the attacker to execute arbitrary code. This does not affect Unix systems. This is the result of an incomplete fix for CVE-2020-27955. This issue occurs because on Windows Go includes (and prefers) the current directory when the name of a command run does not contain a directory separator. Other than avoiding untrusted repositories or using a different operating system there is no workaround. This is fixed in v2.13.2.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://github.com/git-lfs/git-lfs/security/advisories/GHSA-cx3w-xqmc-84g5 https://github.com/git-lfs/git-lfs/commit/fc664697ed2c2081ee9633010de0a7f9debea72a https://github.com/git-lfs/git-lfs/releases/tag/v2.13.2 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27955

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8