Git LFS can execute a Git binary from the current directory on Windows
CVE-2021-21237

7.2HIGH

Key Information:

Vendor

Git-lfs

Status
Git-lfs
Vendor
CVE Published:
15 January 2021

What is CVE-2021-21237?

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.

Affected Version(s)

git-lfs < 2.13.2

References

https://github.com/git-lfs/git-lfs/security/advisories/GH...
x_refsource_CONFIRM
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-2...
x_refsource_MISC
https://github.com/git-lfs/git-lfs/releases/tag/v2.13.2
x_refsource_MISC

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.