Heap-based buffer overflow in FreeBSD libc

1) Heap-based buffer overflow

EUVDB-ID: #VU82984

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5941

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the __sflush() function in libc. A remote attacker can pass specially crafted data to the application that is using the affected library, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

The vulnerability can be used to escalate privileges or remotely execute arbitrary code. The attack vector depends on the application or daemon that uses the vulnerable libc version.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 12.4 - 14.0

External links

http://security.freebsd.org/advisories/FreeBSD-SA-23:15.stdio.asc

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.