libgit2 up to 1.6.4/1.7.1 src/libgit2/revparse.c git_revparse_single resource consumption

Summaryinfo

A vulnerability has been found in libgit2 up to 1.6.4/1.7.1 and classified as problematic. Affected by this issue is the function git_revparse_single in the library src/libgit2/revparse.c. The manipulation leads to resource consumption. This vulnerability is uniquely identified as CVE-2024-24575. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in libgit2 up to 1.6.4/1.7.1 and classified as problematic. This issue affects the function git_revparse_single in the library src/libgit2/revparse.c. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Using well-crafted inputs to `git_revparse_single` can cause the function to enter an infinite loop, potentially causing a Denial of Service attack in the calling application. The revparse function in `src/libgit2/revparse.c` uses a loop to parse the user-provided spec string. There is an edge-case during parsing that allows a bad actor to force the loop conditions to access arbitrary memory. Potentially, this could also leak memory if the extracted rev spec is reflected back to the attacker. As such, libgit2 versions before 1.4.0 are not affected. Users should upgrade to version 1.6.5 or 1.7.2.

The weakness was disclosed 02/07/2024 as GHSA-54mf-x2rh-hq9v. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2024-24575 since 01/25/2024. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 211258 (Fedora 41 : rust-asyncgit / rust-bat / rust-cargo-c / rust-eza / etc (2024-401f10a92f)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.6.5 or 1.7.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch add2dabb3c16aa49b33904dcdc07cd915efc12fa 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.

The vulnerability is also documented in the vulnerability database at Tenable (211258). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• libgit2

Version

• 1.6.0
• 1.6.1
• 1.6.2
• 1.6.3
• 1.6.4
• 1.7.0
• 1.7.1

License

• open-source

Website

• Product: https://github.com/libgit2/libgit2/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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