Amazon Linux AMI Security Advisory: ALAS-2014-408
Advisory Release Date: 2014-09-19 12:08 Pacific
A heap-based buffer overflow flaw was found in procmail's formail utility. A remote attacker could send an email with specially crafted headers that, when processed by formail, could cause procmail to crash or, possibly, execute arbitrary code as the user running formail. (CVE-2014-3618 )
Run yum update procmail to update your system.