FreeBSD up to 13.4 p2/14.1/14.2 on 64-bit tarfs/ext2fs VOP_VPTOFH stack-based overflow

Summaryinfo

A vulnerability labeled as critical has been found in FreeBSD up to 13.4 p2/14.1/14.2 on 64-bit. This affects the function VOP_VPTOFH of the component tarfs/ext2fs. Such manipulation leads to stack-based overflow. This vulnerability is listed as CVE-2025-0373. The attack may be performed from remote. There is no available exploit. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in FreeBSD up to 13.4 p2/14.1/14.2 on 64-bit. It has been rated as critical. Affected by this issue is the function VOP_VPTOFH of the component tarfs/ext2fs. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is availability. CVE summarizes:

On 64-bit systems, the implementation of VOP_VPTOFH() in the cd9660, tarfs and ext2fs filesystems overflows the destination FID buffer by 4 bytes, a stack buffer overflow. A NFS server that exports a cd9660, tarfs, or ext2fs file system can be made to panic by mounting and accessing the export with an NFS client. Further exploitation (e.g., bypassing file permission checking or remote kernel code execution) is potentially possible, though this has not been demonstrated. In particular, release kernels are compiled with stack protection enabled, and some instances of the overflow are caught by this mechanism, causing a panic.

The weakness was presented by Kevin Miller. The advisory is available at security.freebsd.org. This vulnerability is handled as CVE-2025-0373 since 01/10/2025. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 01/30/2025).

Applying the patch 13.4 p3/14.1 p7/14.2 p1 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Name

• FreeBSD

Version

• 13.4 p2
• 14.0
• 14.1
• 14.2

License

• open-source

Website

• Product: https://www.freebsd.org/

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