CVE-2021-29468
A specially crafted repository that contains symbolic links as well as files with backslash characters in the file name may cause just-checked out code to be executed while checking out a repository using Git on Cygwin.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Cygwin Git is a patch set for the git command line tool for the cygwin environment. A specially crafted repository that contains symbolic links as well as files with backslash characters in the file name may cause just-checked out code to be executed while checking out a repository using Git on Cygwin. The problem will be patched in the Cygwin Git v2.31.1-2 release. At time of writing, the vulnerability is present in the upstream Git source code; any Cygwin user who compiles Git for themselves from upstream sources should manually apply a patch to mitigate the vulnerability. As mitigation users should not clone or pull from repositories from untrusted sources. CVE-2019-1354 was an equivalent vulnerability in Git for Visual Studio.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 1.24% probability · 67th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- cygwin/git
- Source
- security-advisories@github.com
References
- https://cygwin.com/pipermail/cygwin-announce/2021-April/010018.htmlMailing List, Patch, Vendor Advisory
- https://github.com/me-and/Cygwin-Git/blob/main/check-backslash-safety.patchPatch, Third Party Advisory
- https://github.com/me-and/Cygwin-Git/security/advisories/GHSA-rmp3-wq55-f557Patch, Third Party Advisory
- https://lore.kernel.org/git/CA+kUOa=juEdBMVr_gyTKjz7PkPt2DZHkXQyzcQmAWCsEHC_ssw%40mail.gmail.com/T/#u
- https://cygwin.com/pipermail/cygwin-announce/2021-April/010018.htmlMailing List, Patch, Vendor Advisory
- https://github.com/me-and/Cygwin-Git/blob/main/check-backslash-safety.patchPatch, Third Party Advisory
- https://github.com/me-and/Cygwin-Git/security/advisories/GHSA-rmp3-wq55-f557Patch, Third Party Advisory
- https://lore.kernel.org/git/CA+kUOa=juEdBMVr_gyTKjz7PkPt2DZHkXQyzcQmAWCsEHC_ssw%40mail.gmail.com/T/#u
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.