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Ubuntu Security Notice USN-6543-1
December 11, 2023

tar vulnerability

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

• Ubuntu 23.10
• Ubuntu 23.04
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• 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:

tar could be made to crash if it opened a specially crafted file.

Software Description:

• tar: GNU version of the tar archiving utility

Details:

It was discovered that tar incorrectly handled extended attributes in PAX
archives. An attacker could use this issue to cause tar to crash, resulting in a
denial of service.

Update instructions:

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

Ubuntu 23.10:
tar 1.34+dfsg-1.2ubuntu1.1

Ubuntu 23.04:
tar 1.34+dfsg-1.2ubuntu0.2

Ubuntu 22.04 LTS:
tar 1.34+dfsg-1ubuntu0.1.22.04.2

Ubuntu 20.04 LTS:
tar 1.30+dfsg-7ubuntu0.20.04.4

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
tar 1.29b-2ubuntu0.4+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
tar 1.28-2.1ubuntu0.2+esm3

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
tar 1.27.1-1ubuntu0.1+esm4

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

References:
https://ubuntu.com/security/notices/USN-6543-1
CVE-2023-39804

Package Information:
https://launchpad.net/ubuntu/+source/tar/1.34+dfsg-1.2ubuntu1.1
https://launchpad.net/ubuntu/+source/tar/1.34+dfsg-1.2ubuntu0.2
https://launchpad.net/ubuntu/+source/tar/1.34+dfsg-1ubuntu0.1.22.04.2
https://launchpad.net/ubuntu/+source/tar/1.30+dfsg-7ubuntu0.20.04.4