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Ubuntu Security Notice USN-6360-2
September 22, 2023

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

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

FLAC could be made to crash or run programs as your login if it opened a
specially crafted file.

Software Description:
- flac: Free Lossless Audio Codec

Details:

USN-6360-1 fixed a vulnerability in FLAC. This update provides the
corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and
Ubuntu 18.04 LTS.

Original advisory details:

  It was discovered that FLAC incorrectly handled encoding certain files. A
  remote attacker could use this issue to cause FLAC to crash, resulting 
in a
  denial of service, or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   flac                            1.3.2-1ubuntu0.1+esm1
   libflac8                        1.3.2-1ubuntu0.1+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   flac                            1.3.1-4ubuntu0.1~esm2
   libflac8                        1.3.1-4ubuntu0.1~esm2

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   flac                            1.3.0-2ubuntu0.14.04.1+esm2
   libflac8                        1.3.0-2ubuntu0.14.04.1+esm2

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

References:
   https://ubuntu.com/security/notices/USN-6360-2
   https://ubuntu.com/security/notices/USN-6360-1
   CVE-2020-22219