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

Description

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.

Remediation

External links

• 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