CVE-2021-29468 – Arbitrary code execution when checking out an attacker-controlled Git branch

https://notcve.org/view.php?id=CVE-2021-29468

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. • https://cygwin.com/pipermail/cygwin-announce/2021-April/010018.html https://github.com/me-and/Cygwin-Git/blob/main/check-backslash-safety.patch https://github.com/me-and/Cygwin-Git/security/advisories/GHSA-rmp3-wq55-f557 https://lore.kernel.org/git/CA+kUOa=juEdBMVr_gyTKjz7PkPt2DZHkXQyzcQmAWCsEHC_ssw%40mail.gmail.com/T/#u • CWE-20: Improper Input Validation •