CVE-2021-21237

Published: 15 January 2021

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.

Priority

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package	Release	Status
git-lfs Launchpad, Ubuntu, Debian	bionic	Needed
	focal	Needed
	groovy	Ignored (end of life)
	hirsute	Not vulnerable (2.13.2-1)
	impish	Not vulnerable (2.13.2-1)
	jammy	Not vulnerable (2.13.2-1)
	kinetic	Not vulnerable (2.13.2-1)
	lunar	Not vulnerable (2.13.2-1)
	mantic	Not vulnerable (2.13.2-1)
	trusty	Does not exist
	upstream	Released (v2.13.2)
	xenial	Does not exist

Severity score breakdown

Parameter	Value
Base score	7.8
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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