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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