Local Git clone may hardlink arbitrary user-readable files into the new repository's "objects/" directory
概要
Local Git clone may hardlink arbitrary user-readable files into the new repository's "objects/" directory
原文の説明
取得元が公開している説明をそのまま載せています (多くは英語)。
Git is a revision control system. Prior to versions 2.45.1, 2.44.1, 2.43.4, 2.42.2, 2.41.1, 2.40.2, and 2.39.4, when cloning a local source repository that contains symlinks via the filesystem, Git may create hardlinks to arbitrary user-readable files on the same filesystem as the target repository in the objects/ directory. Cloning a local repository over the filesystem may creating hardlinks to arbitrary user-owned files on the same filesystem in the target Git repository's objects/ directory. When cloning a repository over the filesystem (without explicitly specifying the file:// protocol or --no-local), the optimizations for local cloning
will be used, which include attempting to hard link the object files instead of copying them. While the code includes checks against symbolic links in the source repository, which were added during the fix for CVE-2022-39253, these checks can still be raced because the hard link operation ultimately follows symlinks. If the object on the filesystem appears as a file during the check, and then a symlink during the operation, this will allow the adversary to bypass the check and create hardlinks in the destination objects directory to arbitrary, user-readable files. The problem has been patched in versions 2.45.1, 2.44.1, 2.43.4, 2.42.2, 2.41.1, 2.40.2, and 2.39.4.
出典: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
影響パッケージ
ディストリビューション別の修正状況
各ディストリビューションが公開している、この CVE の修正パッケージ
- Alpine Linux ALPINE-CVE-2024-32021 git 修正版: 2.39.5-r0
- Debian DEBIAN-CVE-2024-32021 git 修正版: 1:2.30.2-1+deb11u3
参照URL
- advisory github.com
- advisory openwall.com
- advisory lists.fedoraproject.org
- advisory lists.debian.org
- advisory lists.debian.org
- web nvd.nist.gov