#VU84802 Reachable Assertion in FFmpeg - CVE-2021-38291

Vulnerability identifier: #VU84802

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-38291

CWE-ID: CWE-617

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FFmpeg
Universal components / Libraries / Libraries used by multiple products

Vendor: ffmpeg.sourceforge.net

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion in src/libavutil/mathematics.c. A remote attacker can trick the victim to open a specially crafted file and crash the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FFmpeg: 4.0 - 4.1.6

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External links
https://trac.ffmpeg.org/ticket/9312
https://www.debian.org/security/2021/dsa-4990
https://www.debian.org/security/2021/dsa-4998
https://lists.debian.org/debian-lts-announce/2021/11/msg00012.html
https://security.gentoo.org/glsa/202312-14

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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.