=========================================================================Ubuntu Security Notice USN-5787-1
January 05, 2023

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Libksba could be made to crash or run programs if it processed specially
crafted data.

Software Description:
- libksba: X.509 and CMS support library

Details:

It was discovered that Libksba incorrectly handled parsing CRL signatures.
A remote attacker could use this issue to cause Libksba 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 22.10:
   libksba8                        1.6.0-3ubuntu1.1

Ubuntu 22.04 LTS:
   libksba8                        1.6.0-2ubuntu0.2

Ubuntu 20.04 LTS:
   libksba8                        1.3.5-2ubuntu0.20.04.2

Ubuntu 18.04 LTS:
   libksba8                        1.3.5-2ubuntu0.18.04.2

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

References:
   https://ubuntu.com/security/notices/USN-5787-1
   CVE-2022-47629

Package Information:
   https://launchpad.net/ubuntu/+source/libksba/1.6.0-3ubuntu1.1
   https://launchpad.net/ubuntu/+source/libksba/1.6.0-2ubuntu0.2
   https://launchpad.net/ubuntu/+source/libksba/1.3.5-2ubuntu0.20.04.2
   https://launchpad.net/ubuntu/+source/libksba/1.3.5-2ubuntu0.18.04.2