NULL pointer dereference in Libav and FFmpeg - CVE-2017-1000460
Published: January 3, 2018 / Updated: August 8, 2020
Vulnerability identifier: #VU37710
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2017-1000460
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Libav
ffmpeg.sourceforge.net
ffmpeg.sourceforge.net
Affected software:
Libav
FFmpeg
Libav
FFmpeg
Detailed vulnerability 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.
How to mitigate CVE-2017-1000460
Install update from vendor's website.