Amazon Linux AMI Security Advisory: ALAS-2011-18
Advisory Release Date: 2014-09-14 14:41 Pacific
A use-after-free flaw was found in the way Openswan's pluto IKE daemon used cryptographic helpers. A remote, authenticated attacker could send a specially-crafted IKE packet that would crash the pluto daemon. This issue only affected SMP (symmetric multiprocessing) systems that have the cryptographic helpers enabled.
Run yum update openswan to update your system.