Vulnerability identifier: #VU37710

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-1000460

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

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

Vendor: Libav
ffmpeg.sourceforge.net

Description

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

In line libavcodec/h264dec.c:500 in libav(v13_dev0), ffmpeg(n3.4), chromium(56 prior Feb 13, 2017), the return value of init_get_bits is ignored and get_ue_golomb(&gb) is called on an uninitialized get_bits context, which causes a NULL deref exception.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Libav: 13_dev0

FFmpeg: 3.4 - 13_dev0

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External links
http://bugzilla.libav.org/show_bug.cgi?id=952
http://chromium.googlesource.com/chromium/third_party/ffmpeg/+/8e313ca08800178efce00045e07dc494d437b70c
http://lists.debian.org/debian-lts-announce/2019/03/msg00041.html
http://lists.ffmpeg.org/pipermail/ffmpeg-cvslog/2017-January/104221.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.