CVE-2021-21237
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.44%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.44% probability · 37th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-426
- Affected
- git large file storage project/git large file storage
- Source
- security-advisories@github.com
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27955Third Party Advisory
- https://github.com/git-lfs/git-lfs/commit/fc664697ed2c2081ee9633010de0a7f9debea72aPatch, Third Party Advisory
- https://github.com/git-lfs/git-lfs/releases/tag/v2.13.2Third Party Advisory
- https://github.com/git-lfs/git-lfs/security/advisories/GHSA-cx3w-xqmc-84g5Third Party Advisory
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27955Third Party Advisory
- https://github.com/git-lfs/git-lfs/commit/fc664697ed2c2081ee9633010de0a7f9debea72aPatch, Third Party Advisory
- https://github.com/git-lfs/git-lfs/releases/tag/v2.13.2Third Party Advisory
- https://github.com/git-lfs/git-lfs/security/advisories/GHSA-cx3w-xqmc-84g5Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.