#VU43699 Buffer overflow in FFmpeg and Libav - CVE-2011-3940

Vulnerability identifier: #VU43699

Vulnerability risk: Medium

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-3940

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FFmpeg
Universal components / Libraries / Libraries used by multiple products
Libav
Client/Desktop applications / Multimedia software

Vendor: ffmpeg.sourceforge.net
Libav

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

nsvdec.c in libavcodec in FFmpeg 0.7.x before 0.7.12 and 0.8.x before 0.8.11, and in Libav 0.5.x before 0.5.9, 0.6.x before 0.6.6, 0.7.x before 0.7.5, and 0.8.x before 0.8.1, allows remote attackers to cause a denial of service (out-of-bounds read and write) via a crafted NSV file that triggers "use of uninitialized streams."

Mitigation
Install update from vendor's website.

Vulnerable software versions

FFmpeg: 0.7.1 - 0.8.10

Libav: 0.5 - 0.8.10

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External links
https://ffmpeg.org/
https://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=5c011706bc752d34bc6ada31d7df2ca0c9af7c6b
https://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=8fd8a48263ff1437f9d02d7e78dc63efb9b5ed3a
https://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=c898431ca5ef2a997fe9388b650f658fb60783e5
https://libav.org/
https://secunia.com/advisories/49089
https://www.debian.org/security/2012/dsa-2471
https://www.ubuntu.com/usn/USN-1479-1

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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.