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Published: 14 May 2024

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, repositories with submodules can be crafted in a way that exploits a bug in Git whereby it can be fooled into writing files not into the submodule's worktree but into a `.git/` directory. This allows writing a hook that will be executed while the clone operation is still running, giving the user no opportunity to inspect the code that is being executed. 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. If symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. As always, it is best to avoid cloning repositories from untrusted sources.


One can avoid it if symbolic link support is disable "config --global core.symlinks false"
This issue exploits case insensitivity. As in Linux Ext4 has an option to turn on
case insensitivity Linux could be a target.
This issue was not reproducible, but fixed in all releases but Focal, Bionic
and xenial, where source
is not backportable in a first glance. Pending further investigation.



Cvss 3 Severity Score


Score breakdown


Package Release Status
Launchpad, Ubuntu, Debian
bionic Needs triage

Released (1:2.25.1-1ubuntu3.13)
Released (1:2.34.1-1ubuntu1.11)
Released (1:2.40.1-1ubuntu1.1)
Released (1:2.43.0-1ubuntu7.1)
Released (2.45.1)
xenial Needs triage

Severity score breakdown

Parameter Value
Base score 9.0
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H