libgit2 up to 0.27.2 delta.c git_delta_apply out-of-bounds

Summaryinfo

A vulnerability was found in libgit2 up to 0.27.2 and classified as problematic. Affected by this vulnerability is the function git_delta_apply of the file delta.c. Executing a manipulation can lead to out-of-bounds. This vulnerability is tracked as CVE-2018-10888. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in libgit2 up to 0.27.2. This vulnerability affects the function git_delta_apply of the file delta.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. CVE summarizes:

A flaw was found in libgit2 before version 0.27.3. A missing check in git_delta_apply function in delta.c file, may lead to an out-of-bound read while reading a binary delta file. An attacker may use this flaw to cause a Denial of Service.

The bug was discovered 07/11/2018. The weakness was disclosed 07/10/2018 as Bug 1598024 as confirmed bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability was named CVE-2018-10888 since 05/09/2018. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 111019 (FreeBSD : Libgit2 -- multiple vulnerabilities (3c9b7698-84da-11e8-8c75-d8cb8abf62dd)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171683 (SUSE Enterprise Linux Security Update for libgit2 (SUSE-SU-2018:3440-1)).

Upgrading to version 0.27.3 eliminates this vulnerability. A possible mitigation has been published 1 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (111019) and SecurityFocus (BID 104345†). The entries VDB-114492, VDB-118361, VDB-121131 and VDB-123017 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• libgit2

Version

• 0.27.0
• 0.27.1
• 0.27.2

License

• open-source

Website

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

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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