CVE-2020-13904: Use After Free
First published: Sun Jun 07 2020(Updated: )
FFmpeg 2.8 and 4.2.3 has a use-after-free via 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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FFmpeg FFmpeg | =2.8 | |
| FFmpeg FFmpeg | =4.2.3 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =20.04 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| debian/ffmpeg | 7:4.3.7-0+deb11u1 7:5.1.6-0+deb12u1 7:7.0.2-3 |
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Reference 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
- https://lists.debian.org/debian-lts-announce/2020/07/msg00022.html
- https://usn.ubuntu.com/4431-1/
- https://security.gentoo.org/glsa/202007-58
- https://github.com/FFmpeg/FFmpeg/commit/6959358683c7533f586c07a766acc5fe9544d8b2
- https://launchpad.net/bugs/cve/CVE-2020-13904
- https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200529033905.41926-1-lq%40chinaffmpeg.org/
- https://github.com/FFmpeg/FFmpeg/commit/9dfb19baeb86a8bb02c53a441682c6e9a6e104cc
- https://security-tracker.debian.org/tracker/CVE-2020-13904
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13904
- https://nvd.nist.gov/vuln/detail/CVE-2020-13904
- https://ubuntu.com/security/CVE-2020-13904
Frequently Asked Questions
What is CVE-2020-13904?
CVE-2020-13904 is a vulnerability in FFmpeg 2.8 and 4.2.3 that allows for a use-after-free attack via a crafted EXTINF duration in an m3u8 file.
How severe is CVE-2020-13904?
CVE-2020-13904 has a severity score of 5.5, which is considered medium.
Which software versions are affected by CVE-2020-13904?
FFmpeg versions 2.8 and 4.2.3 are affected by CVE-2020-13904.
How can I fix CVE-2020-13904?
To fix CVE-2020-13904, update to FFmpeg version 4.2.4-1ubuntu0.1 or later.
Where can I find more information about CVE-2020-13904?
More information about CVE-2020-13904 can be found at the following references: [Link 1](https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200529033905.41926-1-lq@chinaffmpeg.org/), [Link 2](https://trac.ffmpeg.org/ticket/8673), [Link 3](https://www.debian.org/security/2020/dsa-4722).
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