Ubuntu Security Notice 5651-2 - USN-5651-1 fixed a vulnerability in strongSwan. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. Lahav Schlesinger discovered that strongSwan incorrectly handled certain OCSP URIs and and CRL distribution points 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.
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