==========================================================================
Ubuntu Security Notice USN-6449-2
November 15, 2023

ffmpeg regression
==========================================================================

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

- Ubuntu 22.04 LTS (Available with Ubuntu Pro)
- Ubuntu 20.04 LTS (Available with Ubuntu Pro)
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

Summary:

USN-6449-1 introduced a regression in FFmpeg

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

Details:

USN-6449-1 fixed vulnerabilities in FFmpeg. Unfortunately that update
could introduce a regression in tools using an FFmpeg library, like VLC.

This updated fixes the problem. We apologize for the inconvenience.

Original advisory details:

It was discovered that FFmpeg incorrectly managed memory resulting
in a memory leak. An attacker could possibly use this issue to cause
a denial of service via application crash. This issue only
affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-22038)

It was discovered that FFmpeg incorrectly handled certain input files,
leading to an integer overflow. 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-2020-20898, CVE-2021-38090,
CVE-2021-38091, CVE-2021-38092, CVE-2021-38093, CVE-2021-38094)

It was discovered that FFmpeg incorrectly managed memory, resulting in
a memory leak.  If a user or automated system were tricked into
processing a specially crafted input file, a remote attacker could
possibly use this issue to cause a denial of service, or execute
arbitrary code. (CVE-2022-48434)

Update instructions:

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

Ubuntu 22.04 LTS (Available with Ubuntu Pro):
   ffmpeg                          7:4.4.2-0ubuntu0.22.04.1+esm3
   libavcodec-extra                7:4.4.2-0ubuntu0.22.04.1+esm3
   libavcodec-extra58              7:4.4.2-0ubuntu0.22.04.1+esm3
   libavcodec58                    7:4.4.2-0ubuntu0.22.04.1+esm3
   libavdevice58                   7:4.4.2-0ubuntu0.22.04.1+esm3
   libavfilter-extra               7:4.4.2-0ubuntu0.22.04.1+esm3
   libavfilter-extra7              7:4.4.2-0ubuntu0.22.04.1+esm3
   libavfilter7                    7:4.4.2-0ubuntu0.22.04.1+esm3
   libavformat-extra               7:4.4.2-0ubuntu0.22.04.1+esm3
   libavformat-extra58             7:4.4.2-0ubuntu0.22.04.1+esm3
   libavformat58                   7:4.4.2-0ubuntu0.22.04.1+esm3
   libavutil56                     7:4.4.2-0ubuntu0.22.04.1+esm3
   libpostproc55                   7:4.4.2-0ubuntu0.22.04.1+esm3
   libswresample3                  7:4.4.2-0ubuntu0.22.04.1+esm3
   libswscale5                     7:4.4.2-0ubuntu0.22.04.1+esm3

Ubuntu 20.04 LTS (Available with Ubuntu Pro):
   ffmpeg                          7:4.2.7-0ubuntu0.1+esm4
   libavcodec-extra                7:4.2.7-0ubuntu0.1+esm4
   libavcodec-extra58              7:4.2.7-0ubuntu0.1+esm4
   libavcodec58                    7:4.2.7-0ubuntu0.1+esm4
   libavdevice58                   7:4.2.7-0ubuntu0.1+esm4
   libavfilter-extra               7:4.2.7-0ubuntu0.1+esm4
   libavfilter-extra7              7:4.2.7-0ubuntu0.1+esm4
   libavfilter7                    7:4.2.7-0ubuntu0.1+esm4
   libavformat58                   7:4.2.7-0ubuntu0.1+esm4
   libavresample4                  7:4.2.7-0ubuntu0.1+esm4
   libavutil-dev                   7:4.2.7-0ubuntu0.1+esm4
   libavutil56                     7:4.2.7-0ubuntu0.1+esm4
   libpostproc55                   7:4.2.7-0ubuntu0.1+esm4
   libswresample3                  7:4.2.7-0ubuntu0.1+esm4
   libswscale5                     7:4.2.7-0ubuntu0.1+esm4

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   ffmpeg                          7:3.4.11-0ubuntu0.1+esm4
   libavcodec-extra                7:3.4.11-0ubuntu0.1+esm4
   libavcodec-extra57              7:3.4.11-0ubuntu0.1+esm4
   libavcodec57                    7:3.4.11-0ubuntu0.1+esm4
   libavdevice-dev                 7:3.4.11-0ubuntu0.1+esm4
   libavdevice57                   7:3.4.11-0ubuntu0.1+esm4
   libavfilter-dev                 7:3.4.11-0ubuntu0.1+esm4
   libavfilter-extra               7:3.4.11-0ubuntu0.1+esm4
   libavfilter-extra6              7:3.4.11-0ubuntu0.1+esm4
   libavfilter6                    7:3.4.11-0ubuntu0.1+esm4
   libavformat57                   7:3.4.11-0ubuntu0.1+esm4
   libavresample3                  7:3.4.11-0ubuntu0.1+esm4
   libavutil-dev                   7:3.4.11-0ubuntu0.1+esm4
   libavutil55                     7:3.4.11-0ubuntu0.1+esm4
   libpostproc54                   7:3.4.11-0ubuntu0.1+esm4
   libswresample2                  7:3.4.11-0ubuntu0.1+esm4
   libswscale4                     7:3.4.11-0ubuntu0.1+esm4

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

References:
   https://ubuntu.com/security/notices/USN-6449-2
   https://ubuntu.com/security/notices/USN-6449-1
   https://launchpad.net/bugs/2042743