USN-5733-1: FLAC vulnerabilities

Releases

• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• flac - Free Lossless Audio Codec

Details

It was discovered that FLAC was not properly performing memory management
operations, which could result in a memory leak. An attacker could possibly
use this issue to cause FLAC to consume resources, leading to a denial of
service. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM and
Ubuntu 18.04 LTS. (CVE-2017-6888)

It was discovered that FLAC was not properly performing bounds checking
operations when decoding data. If a user or automated system were tricked
into processing a specially crafted file, an attacker could possibly use
this issue to expose sensitive information or to cause FLAC to crash,
leading to a denial of service. This issue only affected Ubuntu 14.04 ESM,
Ubuntu 16.04 ESM, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-0499)

It was discovered that FLAC was not properly performing bounds checking
operations when encoding data. If a user or automated system were tricked
into processing a specially crafted file, an attacker could possibly use
this issue to expose sensitive information or to cause FLAC to crash,
leading to a denial of service. (CVE-2021-0561)

Update instructions

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

Ubuntu 22.04

• flac - 1.3.3-2ubuntu0.1
• libflac++6v5 - 1.3.3-2ubuntu0.1
• libflac8 - 1.3.3-2ubuntu0.1

Ubuntu 20.04

• flac - 1.3.3-1ubuntu0.1
• libflac++6v5 - 1.3.3-1ubuntu0.1
• libflac8 - 1.3.3-1ubuntu0.1

Ubuntu 18.04

• flac - 1.3.2-1ubuntu0.1
• libflac++6v5 - 1.3.2-1ubuntu0.1
• libflac8 - 1.3.2-1ubuntu0.1

Ubuntu 16.04

• flac - 1.3.1-4ubuntu0.1~esm1
  Available with Ubuntu Pro
• libflac++6v5 - 1.3.1-4ubuntu0.1~esm1
  Available with Ubuntu Pro
• libflac8 - 1.3.1-4ubuntu0.1~esm1
  Available with Ubuntu Pro

Ubuntu 14.04

• flac - 1.3.0-2ubuntu0.14.04.1+esm1
  Available with Ubuntu Pro
• libflac++6 - 1.3.0-2ubuntu0.14.04.1+esm1
  Available with Ubuntu Pro
• libflac8 - 1.3.0-2ubuntu0.14.04.1+esm1
  Available with Ubuntu Pro

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

References

• CVE-2017-6888
• CVE-2020-0499
• CVE-2021-0561