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CVE-2021-21300

Status Candidate

Overview

Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.

Related Files

Gentoo Linux Security Advisory 202104-01
Posted May 3, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202104-1 - A vulnerability has been found in Git that could allow a remote attacker to execute arbitrary code. Versions less than 2.26.3 are affected.

tags | advisory, remote, arbitrary
systems | linux, gentoo
advisories | CVE-2021-21300
MD5 | ece8db17175da3a175f99db2c818ccfa
Apple Security Advisory 2021-04-26-10
Posted Apr 28, 2021
Authored by Apple | Site apple.com

Apple Security Advisory 2021-04-26-10 - Xcode 12.5 addresses an arbitrary code execution vulnerability.

tags | advisory, arbitrary, code execution
systems | apple
advisories | CVE-2021-21300
MD5 | 2c6f6cb6441710436e39f98eee4c3335
Ubuntu Security Notice USN-4761-1
Posted Mar 10, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4761-1 - Matheus Tavares discovered that Git incorrectly handled delay-capable clean/smudge filters when being used on case-insensitive filesystems. A remote attacker could possibly use this issue to execute arbitrary code.

tags | advisory, remote, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-21300
MD5 | 7a9a215b27ae633fcf542a2b4f854615
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