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Git LFS can execute a Git binary from the current directory

High
bk2204 published GHSA-4g4p-42wc-9f3m Nov 4, 2020

Package

gomod git-lfs (Go)

Affected versions

< 2.12.1

Patched versions

2.12.1

Description

Impact

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 occurs because on Windows, Go includes (and prefers) the current directory when the name of a command run does not contain a directory separator.

Patches

This version should be patched in v2.12.1, which will be released in coordination with this security advisory.

Workarounds

Other than avoiding untrusted repositories, there is no workaround.

For more information

If you have any questions or comments about this advisory:

  • Start a discussion in the Git LFS discussion page.
  • If you cannot open a discussion, please email the core team using their usernames at github.com.

Severity

High
7.8
/ 10

CVSS base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVE ID

CVE-2020-27955

Weaknesses

No CWEs