#VU110583 Input validation error in FFmpeg - CVE-2015-6823

Vulnerability identifier: #VU110583

Vulnerability risk: Medium

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

CVE-ID: CVE-2015-6823

CWE-ID: CWE-20

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 non-authenticated attacker to read and manipulate data.

The allocate_buffers function in libavcodec/alac.c in FFmpeg before 2.7.2 does not initialize certain context data, which allows remote attackers to cause a denial of service (segmentation violation) or possibly have unspecified other impact via crafted Apple Lossless Audio Codec (ALAC) data.

Mitigation
Install update from vendor's website.

Vulnerable software versions

FFmpeg: 2.7, 2.7.0, 2.7.1

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External links
https://ffmpeg.org/security.html
https://git.videolan.org/?p=ffmpeg.git;a=commit;h=f7068bf277a37479aecde2832208d820682b35e6
https://www.securitytracker.com/id/1033483
https://lists.debian.org/debian-lts-announce/2018/12/msg00010.html

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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.