Git Local Clone Optimization $GIT_DIR/objects link following

Summaryinfo

A vulnerability labeled as critical has been found in Git. This vulnerability affects unknown code of the file $GIT_DIR/objects of the component Local Clone Optimization. The manipulation results in link following. This vulnerability is known as CVE-2023-22490. Attacking locally is a requirement. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, was found in Git (Versioning Software) (the affected version unknown). Affected is an unknown part of the file $GIT_DIR/objects of the component Local Clone Optimization. The manipulation with an unknown input leads to a link following vulnerability. CWE is classifying the issue as CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Git is a revision control system. Using a specially-crafted repository, Git prior to versions 2.39.2, 2.38.4, 2.37.6, 2.36.5, 2.35.7, 2.34.7, 2.33.7, 2.32.6, 2.31.7, and 2.30.8 can be tricked into using its local clone optimization even when using a non-local transport. Though Git will abort local clones whose source `$GIT_DIR/objects` directory contains symbolic links, the `objects` directory itself may still be a symbolic link. These two may be combined to include arbitrary files based on known paths on the victim's filesystem within the malicious repository's working copy, allowing for data exfiltration in a similar manner as CVE-2022-39253. A fix has been prepared and will appear in v2.39.2 v2.38.4 v2.37.6 v2.36.5 v2.35.7 v2.34.7 v2.33.7 v2.32.6, v2.31.7 and v2.30.8. If upgrading is impractical, two short-term workarounds are available. Avoid cloning repositories from untrusted sources with `--recurse-submodules`. Instead, consider cloning repositories without recursively cloning their submodules, and instead run `git submodule update` at each layer. Before doing so, inspect each new `.gitmodules` file to ensure that it does not contain suspicious module URLs.

The weakness was published 02/15/2023 as GHSA-3wp6-j8xr-qw85. The advisory is available at github.com. This vulnerability is traded as CVE-2023-22490 since 12/29/2022. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading eliminates this vulnerability. Applying the patch c867e4fa180bec4750e9b54eb10f459030dbebfd is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Versioning Software

Name

• Git

License

• open-source

Website

• Product: https://github.com/git/git/

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