A vulnerability classified as critical was found in FreeBSD up to 12.4-RELEASE-p6/13.2-RELEASE-p4 (Operating System). Affected by this vulnerability is the function __sflush of the component libc. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In versions of FreeBSD 12.4-RELEASE prior to 12.4-RELEASE-p7 and FreeBSD 13.2-RELEASE prior to 13.2-RELEASE-p5 the __sflush() stdio function in libc does not correctly update FILE objects' write space members for write-buffered streams when the write(2) system call returns an error.  Depending on the nature of an application that calls libc's stdio functions and the presence of errors returned from the write(2) system call (or an overridden stdio write routine) a heap buffer overflow may occur. Such overflows may lead to data corruption or the execution of arbitrary code at the privilege level of the calling program.

The weakness was published 11/08/2023 by Inooo. The advisory is shared at security.freebsd.org. This vulnerability is known as CVE-2023-5941 since 11/02/2023. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/05/2023).

Upgrading to version 12.4-RELEASE-p7 or 13.2-RELEASE-p5 eliminates this vulnerability.

Similar entries are available at VDB-87472, VDB-87511, VDB-88996 and VDB-108407.

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• Operating System

Name

• FreeBSD

Version

• 12.4-RELEASE-p6
• 13.2-RELEASE-p4

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• open-source

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