#VU99515 Use-after-free in FreeBSD - CVE-2024-43102

Vulnerability identifier: #VU99515

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-43102

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
FreeBSD
Operating systems & Components / Operating system

Vendor: FreeBSD Foundation

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the _umtx_op(2) system call. A local user can run the UMTX_SHM_DESTROY sub-request in parallel to trigger a use-after-free error and execute arbitrary code or escape Capsicum sandbox.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 13.3 - 14.1

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External links
https://security.freebsd.org/advisories/FreeBSD-SA-24:14.umtx.asc

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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