Heap-based Buffer Overflow Affecting git package, versions <2.36.3-r0
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Test your applications- Snyk ID SNYK-ALPINE316-GIT-3053988
- published 19 Oct 2022
- disclosed 19 Oct 2022
How to fix?
Upgrade Alpine:3.16
git
to version 2.36.3-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream git
package and not the git
package as distributed by Alpine
.
See How to fix?
for Alpine:3.16
relevant fixed versions and status.
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.
References
- http://seclists.org/fulldisclosure/2022/Nov/1
- https://github.com/git/git/security/advisories/GHSA-rjr6-wcq6-83p6
- https://lists.debian.org/debian-lts-announce/2022/12/msg00025.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/C7B6JPKX5CGGLAHXJVQMIZNNEEB72FHD/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OHNO2FB55CPX47BAXMBWUBGWHO6N6ZZH/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UKFHE4KVD7EKS5J3KTDFVBEKU3CLXGVV/
- https://support.apple.com/kb/HT213496
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C7B6JPKX5CGGLAHXJVQMIZNNEEB72FHD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OHNO2FB55CPX47BAXMBWUBGWHO6N6ZZH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UKFHE4KVD7EKS5J3KTDFVBEKU3CLXGVV/
- https://security.gentoo.org/glsa/202312-15