Input validation error in FFmpeg - CVE-2017-14056
Published: August 31, 2017 / Updated: August 4, 2020
Vulnerability identifier: #VU33774
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2017-14056
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
In libavformat/rl2.c in FFmpeg 3.3.3, a DoS in rl2_read_header() due to lack of an EOF (End of File) check might cause huge CPU and memory consumption. When a crafted RL2 file, which claims a large "frame_count" field in the header but does not contain sufficient backing data, is provided, the loops (for offset and size tables) would consume huge CPU and memory resources, since there is no EOF check inside these loops.
Affected software
FFmpeg
Arch Linux
ffmpeg (Alpine package)
Arch Linux
ffmpeg (Alpine package)
How to mitigate CVE-2017-14056
Install update from vendor's website.
ffmpeg (Alpine package) - update to 3.1.11-r1