[USN-6844-2] CUPS regression

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==========================================================================

Ubuntu Security Notice USN-6844-2
June 28, 2024

cups regression
==========================================================================

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

- Ubuntu 24.04 LTS
- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

USN-6844-1 caused the cupsd daemon to never start

Software Description:
- cups: Common UNIX Printing System(tm)

Details:

USN-6844-1 fixed vulnerabilities in the CUPS package. The update
lead to the discovery of a regression in CUPS with regards to
how the cupsd daemon handles Listen configuration directive.
This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:
Rory McNamara discovered that when starting the cupsd server with a
Listen configuration item, the cupsd process fails to validate if
bind call passed. An attacker could possibly trick cupsd to perform
an arbitrary chmod of the provided argument, providing world-writable
access to the target.

Update instructions:

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

Ubuntu 24.04 LTS
  cups                            2.4.7-1.2ubuntu7.2
  cups-daemon                     2.4.7-1.2ubuntu7.2

Ubuntu 23.10
  cups                            2.4.6-0ubuntu3.2
  cups-daemon                     2.4.6-0ubuntu3.2

Ubuntu 22.04 LTS
  cups                            2.4.1op1-1ubuntu4.10
  cups-daemon                     2.4.1op1-1ubuntu4.10

Ubuntu 20.04 LTS
  cups                            2.3.1-9ubuntu1.8
  cups-daemon                     2.3.1-9ubuntu1.8

Ubuntu 18.04 LTS
  cups                            2.2.7-1ubuntu2.10+esm5
                                  Available with Ubuntu Pro
  cups-daemon                     2.2.7-1ubuntu2.10+esm5
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  cups                            2.1.3-4ubuntu0.11+esm7
                                  Available with Ubuntu Pro
  cups-daemon                     2.1.3-4ubuntu0.11+esm7
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-6844-2
  https://ubuntu.com/security/notices/USN-6844-1
  https://launchpad.net/bugs/2070315

Package Information:
  https://launchpad.net/ubuntu/+source/cups/2.4.7-1.2ubuntu7.2
  https://launchpad.net/ubuntu/+source/cups/2.4.6-0ubuntu3.2
  https://launchpad.net/ubuntu/+source/cups/2.4.1op1-1ubuntu4.10
  https://launchpad.net/ubuntu/+source/cups/2.3.1-9ubuntu1.8