#VU70603 Out-of-bounds read in FFmpeg - CVE-2020-20902

Vulnerability identifier: #VU70603

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-20902

CWE-ID: CWE-125

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 gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the long_term_filter() function in g729postfilter.c in FFmpeg. A remote attacker can trigger an out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FFmpeg: before 4.2.2

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External links
https://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=0c61661a2cbe1b8b284c80ada1c2fdddf4992cad
https://trac.ffmpeg.org/ticket/8176

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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.