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USN-5651-2: strongSwan vulnerability

3 October 2022

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




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

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

Ubuntu 16.04
Ubuntu 14.04

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


Related notices

  • USN-5651-1: libstrongswan, strongswan-tnc-pdp, strongswan-swanctl, libcharon-extauth-plugins, strongswan-scepclient, strongswan-tnc-ifmap, libcharon-extra-plugins, strongswan-tnc-client, charon-cmd, strongswan-starter, libstrongswan-extra-plugins, strongswan-libcharon, strongswan-nm, strongswan-charon, libstrongswan-standard-plugins, strongswan, strongswan-pki, charon-systemd, libcharon-standard-plugins, strongswan-tnc-server, strongswan-tnc-base