Use-after-free in FFmpeg - CVE-2020-13904

Vulnerability identifier: #VU29635

CSH Severity: High

CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-13904

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in FFmpeg when processing a crafted EXTINF duration in an m3u8 file because parse_playlist in libavformat/hls.c frees a pointer, and later that pointer is accessed in av_probe_input_format3 in libavformat/format.c. A remote attacker can trick the victim to open a specially crafted media file or playlist, trigger a use-after-free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

FFmpeg
Arch Linux
Gentoo Linux
Ubuntu
ffmpeg (Alpine package)
ffmpeg (Debian package)
libswscale-ffmpeg3 (Ubuntu package)
libavcodec-ffmpeg-extra56 (Ubuntu package)
libavcodec-ffmpeg56 (Ubuntu package)
libavdevice-ffmpeg56 (Ubuntu package)
libavfilter-ffmpeg5 (Ubuntu package)
libavformat-ffmpeg56 (Ubuntu package)
libavresample-ffmpeg2 (Ubuntu package)
ffmpeg (Ubuntu package)
libavutil-ffmpeg54 (Ubuntu package)
libpostproc-ffmpeg53 (Ubuntu package)
libswresample-ffmpeg1 (Ubuntu package)
libavdevice57 (Ubuntu package)
libswscale4 (Ubuntu package)
libswresample2 (Ubuntu package)
libpostproc54 (Ubuntu package)
libavutil55 (Ubuntu package)
libavresample3 (Ubuntu package)
libavformat57 (Ubuntu package)
libavfilter6 (Ubuntu package)
libavfilter-extra6 (Ubuntu package)
libavcodec57 (Ubuntu package)
libavcodec-extra57 (Ubuntu package)
libpostproc55 (Ubuntu package)
libavutil56 (Ubuntu package)
libavresample4 (Ubuntu package)
libavformat58 (Ubuntu package)
libavfilter7 (Ubuntu package)
libavfilter-extra7 (Ubuntu package)
libavdevice58 (Ubuntu package)
libavcodec58 (Ubuntu package)
libavcodec-extra58 (Ubuntu package)
libswresample3 (Ubuntu package)
libswscale5 (Ubuntu package)

Install updates from vendor's website.

FFmpeg - update to 4.2.4
ffmpeg (Alpine package) - addressed in versions 4.0.6-r0, 4.1.6-r0
ffmpeg (Debian package) - update to 7:4.1.6-1~deb10u1
libswscale-ffmpeg3 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
libavcodec-ffmpeg-extra56 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
libavcodec-ffmpeg56 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
libavdevice-ffmpeg56 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
libavfilter-ffmpeg5 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
libavformat-ffmpeg56 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
libavresample-ffmpeg2 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
ffmpeg (Ubuntu package) - addressed in versions 7:2.8.17-0ubuntu0.1, 7:3.4.8-0ubuntu0.2, 7:4.2.4-1ubuntu0.1
libavutil-ffmpeg54 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
libpostproc-ffmpeg53 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
libswresample-ffmpeg1 (Ubuntu package) - update to 7:2.8.17-0ubuntu0.1
libavdevice57 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libswscale4 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libswresample2 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libpostproc54 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libavutil55 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libavresample3 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libavformat57 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libavfilter6 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libavfilter-extra6 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libavcodec57 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libavcodec-extra57 (Ubuntu package) - update to 7:3.4.8-0ubuntu0.2
libpostproc55 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libavutil56 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libavresample4 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libavformat58 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libavfilter7 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libavfilter-extra7 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libavdevice58 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libavcodec58 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libavcodec-extra58 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libswresample3 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1
libswscale5 (Ubuntu package) - update to 7:4.2.4-1ubuntu0.1

• https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200529033905.41926-1-lq@chinaffmpeg.org/
• https://trac.ffmpeg.org/ticket/8673
• https://www.debian.org/security/2020/dsa-4722

• Remote code execution in FFmpeg
• Debian update for ffmpeg
• Arch Linux update for ffmpeg
• Gentoo update for FFmpeg
• Use-after-free in ffmpeg (Alpine package)
• Ubuntu update for ffmpeg