#VU91286 UNIX Hard Link in Git
Vulnerability identifier: #VU91286
Vulnerability risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-62
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Git
Client/Desktop applications /
Software for system administration
Vendor: Git
Description
The vulnerability allows a remote attacker to compromise the original repository.
The vulnerability exists due to insecure hardlink following when working with local clones. Local clones may end up hardlinking files into the target repository's object database when source and target repository reside on the same disk. If the source repository is owned by a different user, then those hardlinked files may be rewritten at any point in time by the untrusted user.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Git: 2.45.0 - 2.45.1, 2.44.0 - 2.44.1, 2.43.0 - 2.43.4, 2.42.0 - 2.42.2, 2.41.0 - 2.41.1, 2.40.0 - 2.40.2, 2.39.0 - 2.39.4, 2.30.0 - 2.30.9, 2.3.0 - 2.38.5, 2.37.0 - 2.37.7, 2.36.0 - 2.36.6, 2.35.0 - 2.35.8, 2.34.0 - 2.34.8, 2.33.0 - 2.33.8, 2.32.0 - 2.32.7, 2.31.0 - 2.31.8, 2.21.0 - 2.21.4, 2.22.0 - 2.22.5, 2.23.0 - 2.23.4, 2.24.0 - 2.24.4, 2.25.0 - 2.25.5, 2.26.0 - 2.26.3, 2.27.0 - 2.27.1, 2.28.0 - 2.28.1, 2.29.0 - 2.29.3, 2.17 - 2.17.5, 2.18.0 - 2.18.4, 2.19.0 - 2.19.5, 2.20.0 - 2.20.4, 2.16.0 - 2.16.6, 2.15.0 - 2.15.4, 2.14 - 2.14.6, 2.13 - 2.13.7, 2.2.0 - 2.2.12, 2.12 - 2.12.5, 2.11 - 2.11.4, 2.10 - 2.10.5, 2.9 - 2.9.5, 2.8 - 2.8.6, 2.7 - 2.7.6, 2.6 - 2.6.7, 2.5 - 2.5.6, 2.4 - 2.4.12, 2.1.0 - 2.1.4, 2.0.0 - 2.0.5
External links
http://github.com/git/git/security/advisories/GHSA-5rfh-556j-fhgj
http://github.com/git/git/commit/1204e1a824c34071019fe106348eaa6d88f9528d
http://github.com/git/git/commit/9e65df5eab274bf74c7b570107aacd1303a1e703
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
