Ubuntu 22.04 LTS USN-5651-1 Moderate: strongSwan Denial Of Service

ubuntu

October 3, 2022

strongSwan could be made do denial of service if it received a specially crafted certificate.

Summary

strongSwan could be made do denial of service if it received

a specially crafted certificate.

Software Description:

- strongswan: IPsec VPN solution

Details:

Lahav Schlesinger discovered that strongSwan incorrectly handled certain OCSP URIs and

and CRL distribution points (CDP) in certificates. A remote attacker could

possibly use this issue to initiate IKE_SAs and send crafted certificates

that contain URIs pointing to servers under their control, which can lead

to a denial-of-service attack.

Topics Covered

security advisory moderate denial of service Ubuntu strongswan

Update Instructions

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

Ubuntu 22.04 LTS:
  libstrongswan                   5.9.5-2ubuntu2.1
  strongswan                      5.9.5-2ubuntu2.1

Ubuntu 20.04 LTS:
  libstrongswan                   5.8.2-1ubuntu3.5
  strongswan                      5.8.2-1ubuntu3.5

Ubuntu 18.04 LTS:
  libstrongswan                   5.6.2-1ubuntu2.9
  strongswan                      5.6.2-1ubuntu2.9

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