=========================================================================Ubuntu Security Notice USN-5787-2
January 09, 2023

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

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:

USN-5787-1 fixed vulnerabilities in Libksba. This update provides the
corresponding updates for Ubuntu 16.04 ESM and Ubuntu 14.04 ESM.

Original advisory 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 16.04 ESM:
   libksba8                        1.3.3-1ubuntu0.16.04.1+esm2

Ubuntu 14.04 ESM:
   libksba8                        1.3.0-3ubuntu0.14.04.2+esm2

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

References:
   https://ubuntu.com/security/notices/USN-5787-2
   https://ubuntu.com/security/notices/USN-5787-1
   CVE-2022-47629