=========================================================================
Ubuntu Security Notice USN-6430-1
October 12, 2023

ffmpeg vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS (Available with Ubuntu Pro)
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in FFmpeg.

Software Description:
- ffmpeg: Tools for transcoding, streaming and playing of multimedia files

Details:

It was discovered that FFmpeg did not properly handle certain inputs in
vf_lagfun.c, resulting in a buffer overflow vulnerability. An attacker
could possibly use this issue to cause a denial of service via application
crash. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-22024)

It was discovered that FFmpeg incorrectly managed memory in avienc.c,
resulting in a memory leak. An attacker could possibly use this issue
to cause a denial of service via application crash. (CVE-2020-22039)

It was discovered that FFmpeg incorrectly handled certain files due to a
memory leak in frame.c. An attacker could possibly use this issue to cause
a denial of service via application crash. This issue affected
Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-22040)

It was discovered that FFmpeg incorrectly handled certain files due to a
memory leak in fifo.c. An attacker could possibly use this issue to cause
a denial of service via application crash. (CVE-2020-22043)

It was discovered that FFmpeg incorrectly handled certain files due to a
memory leak in vf_tile.c. If a user or automated system were tricked into
processing a specially crafted MOV file, an attacker could possibly use
this issue to cause a denial of service. (CVE-2020-22051)

It was discovered that FFmpeg incorrectly handled certain MOV files in
timecode.c, leading to an integer overflow. An attacker could possibly
use this issue to cause a denial of service using a crafted MOV file.
This issue only affected Ubuntu 16.04 LTS. (CVE-2021-28429)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS (Available with Ubuntu Pro):
  ffmpeg                          7:4.2.7-0ubuntu0.1+esm2
  libavcodec-extra                7:4.2.7-0ubuntu0.1+esm2
  libavcodec-extra58              7:4.2.7-0ubuntu0.1+esm2
  libavcodec58                    7:4.2.7-0ubuntu0.1+esm2
  libavdevice58                   7:4.2.7-0ubuntu0.1+esm2
  libavfilter-extra               7:4.2.7-0ubuntu0.1+esm2
  libavfilter-extra7              7:4.2.7-0ubuntu0.1+esm2
  libavfilter7                    7:4.2.7-0ubuntu0.1+esm2
  libavformat58                   7:4.2.7-0ubuntu0.1+esm2
  libavresample4                  7:4.2.7-0ubuntu0.1+esm2
  libavutil56                     7:4.2.7-0ubuntu0.1+esm2
  libpostproc55                   7:4.2.7-0ubuntu0.1+esm2
  libswresample3                  7:4.2.7-0ubuntu0.1+esm2
  libswscale5                     7:4.2.7-0ubuntu0.1+esm2

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  ffmpeg                          7:3.4.11-0ubuntu0.1+esm2
  libavcodec-extra                7:3.4.11-0ubuntu0.1+esm2
  libavcodec-extra57              7:3.4.11-0ubuntu0.1+esm2
  libavcodec57                    7:3.4.11-0ubuntu0.1+esm2
  libavdevice57                   7:3.4.11-0ubuntu0.1+esm2
  libavfilter-extra               7:3.4.11-0ubuntu0.1+esm2
  libavfilter-extra6              7:3.4.11-0ubuntu0.1+esm2
  libavfilter6                    7:3.4.11-0ubuntu0.1+esm2
  libavformat57                   7:3.4.11-0ubuntu0.1+esm2
  libavresample3                  7:3.4.11-0ubuntu0.1+esm2
  libavutil55                     7:3.4.11-0ubuntu0.1+esm2
  libpostproc54                   7:3.4.11-0ubuntu0.1+esm2
  libswresample2                  7:3.4.11-0ubuntu0.1+esm2
  libswscale4                     7:3.4.11-0ubuntu0.1+esm2

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  ffmpeg                          7:2.8.17-0ubuntu0.1+esm6
  libav-tools                     7:2.8.17-0ubuntu0.1+esm6
  libavcodec-extra                7:2.8.17-0ubuntu0.1+esm6
  libavcodec-ffmpeg-extra56       7:2.8.17-0ubuntu0.1+esm6
  libavcodec-ffmpeg56             7:2.8.17-0ubuntu0.1+esm6
  libavdevice-ffmpeg56            7:2.8.17-0ubuntu0.1+esm6
  libavfilter-ffmpeg5             7:2.8.17-0ubuntu0.1+esm6
  libavformat-ffmpeg56            7:2.8.17-0ubuntu0.1+esm6
  libavresample-ffmpeg2           7:2.8.17-0ubuntu0.1+esm6
  libavutil-ffmpeg54              7:2.8.17-0ubuntu0.1+esm6
  libpostproc-ffmpeg53            7:2.8.17-0ubuntu0.1+esm6
  libswresample-ffmpeg1           7:2.8.17-0ubuntu0.1+esm6
  libswscale-ffmpeg3              7:2.8.17-0ubuntu0.1+esm6

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-6430-1
  CVE-2020-22024, CVE-2020-22039, CVE-2020-22040, CVE-2020-22043,
  CVE-2020-22051, CVE-2021-28429