Exploit/Advisories

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Ubuntu Security Notice USN-5733-1
November 21, 2022

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

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

Summary:

Several security issues were fixed in FLAC.

Software Description:
- 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 LTS:
flac 1.3.3-2ubuntu0.1
libflac++6v5 1.3.3-2ubuntu0.1
libflac8 1.3.3-2ubuntu0.1

Ubuntu 20.04 LTS:
flac 1.3.3-1ubuntu0.1
libflac++6v5 1.3.3-1ubuntu0.1
libflac8 1.3.3-1ubuntu0.1

Ubuntu 18.04 LTS:
flac 1.3.2-1ubuntu0.1
libflac++6v5 1.3.2-1ubuntu0.1
libflac8 1.3.2-1ubuntu0.1

Ubuntu 16.04 ESM:
flac 1.3.1-4ubuntu0.1~esm1
libflac++6v5 1.3.1-4ubuntu0.1~esm1
libflac8 1.3.1-4ubuntu0.1~esm1

Ubuntu 14.04 ESM:
flac 1.3.0-2ubuntu0.14.04.1+esm1
libflac++6 1.3.0-2ubuntu0.14.04.1+esm1
libflac8 1.3.0-2ubuntu0.14.04.1+esm1

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

References:
https://ubuntu.com/security/notices/USN-5733-1
CVE-2017-6888, CVE-2020-0499, CVE-2021-0561

Package Information:
https://launchpad.net/ubuntu/+source/flac/1.3.3-2ubuntu0.1
https://launchpad.net/ubuntu/+source/flac/1.3.3-1ubuntu0.1
https://launchpad.net/ubuntu/+source/flac/1.3.2-1ubuntu0.1

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