Amazon Linux AMI Security Advisory: ALAS-2018-1084
Advisory Release Date: 2018-09-19 23:36 Pacific
A heap-based buffer overflow flaw was found in procmail's formail utility. A remote attacker could send a specially crafted email that, when processed by formail, could cause formail to crash or, possibly, execute arbitrary code as the user running formail.(CVE-2017-16844 )
Run yum update procmail to update your system.