==========================================================================
Ubuntu Security Notice USN-6488-1
November 20, 2023

strongswan 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

Summary:

strongSwan could be made to crash or run programs if it received
specially crafted network traffic.

Software Description:
- strongswan: IPsec VPN solution

Details:

Florian Picca discovered that strongSwan incorrectly handled certain DH
public values. A remote attacker could use this issue to cause strongSwan
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 23.10:
   libstrongswan                   5.9.11-1ubuntu1.1
   strongswan                      5.9.11-1ubuntu1.1

Ubuntu 23.04:
   libstrongswan                   5.9.8-3ubuntu4.1
   strongswan                      5.9.8-3ubuntu4.1

Ubuntu 22.04 LTS:
   libstrongswan                   5.9.5-2ubuntu2.2
   strongswan                      5.9.5-2ubuntu2.2

Ubuntu 20.04 LTS:
   libstrongswan                   5.8.2-1ubuntu3.6
   strongswan                      5.8.2-1ubuntu3.6

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

References:
   https://ubuntu.com/security/notices/USN-6488-1
   CVE-2023-41913

Package Information:
   https://launchpad.net/ubuntu/+source/strongswan/5.9.11-1ubuntu1.1
   https://launchpad.net/ubuntu/+source/strongswan/5.9.8-3ubuntu4.1
   https://launchpad.net/ubuntu/+source/strongswan/5.9.5-2ubuntu2.2
   https://launchpad.net/ubuntu/+source/strongswan/5.8.2-1ubuntu3.6