1. Ubuntu Security Notices
  2. USN-5651-2

USN-5651-2: strongSwan vulnerability

Publication date

3 October 2022

Overview

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

Releases

Packages

Details

USN-5651-1 fixed a vulnerability in strongSwan. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory 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.

USN-5651-1 fixed a vulnerability in strongSwan. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory 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.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
16.04 xenial strongswan –  5.3.5-1ubuntu3.8+esm3  
libstrongswan –  5.3.5-1ubuntu3.8+esm3  
14.04 trusty strongswan –  5.1.2-0ubuntu2.11+esm3  
libstrongswan –  5.1.2-0ubuntu2.11+esm3  

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References

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