Arch Linux alert ASA-202007-4 (ffmpeg)

From:
             
 
Morten Linderud <foxboron@archlinux.org> 
To:
             
 
arch-security@archlinux.org 
Subject:
             
 
[ASA-202007-4] ffmpeg: arbitrary code execution 
Date:
             
 
Fri, 31 Jul 2020 22:02:42 +0200
Message-ID:
             
 
<20200731200242.jzjc3i7xst7tb4qy@anathema>
Arch Linux Security Advisory ASA-202007-4
=========================================

Severity: High
Date    : 2020-07-31
CVE-ID  : CVE-2020-13904
Package : ffmpeg
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1180

Summary
=======

The package ffmpeg before version 2:4.3.1-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 2:4.3.1-1.

# pacman -Syu "ffmpeg>=2:4.3.1-1"

The problem has been fixed upstream in version 4.3.1.

Workaround
==========

None.

Description
===========

A use-after-free via a crafted EXTINF duration in an m3u8 file has been
found in ffmpeg <= 4.2.3, 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

Impact
======

An attacker can execute arbitrary code on the affected host via crafted
multimedia content.

References
==========

https://trac.ffmpeg.org/ticket/8673
https://patchwork.ffmpeg.org/project/ffmpeg/patch/2020052...
https://security.archlinux.org/CVE-2020-13904