CVE-2024-32020

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, 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. Cloning local repositories will cause Git to
either copy or hardlink files of the source repository into the target
repository. This significantly speeds up such local clones compared to
doing a “proper” clone and saves both disk space and compute time. When
cloning a repository located on the same disk that is owned by a different
user than the current user we also end up creating such hardlinks. These
files will continue to be owned and controlled by the potentially-untrusted
user and can be rewritten by them at will in the future. 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.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1071160&gt;