Amazon Linux AMI Security Advisory: ALAS-2013-257
Advisory Release Date: 2014-09-16 22:09 Pacific
It was discovered that dracut created initramfs images as world readable. A local user could possibly use this flaw to obtain sensitive information from these files, such as iSCSI authentication passwords, encrypted root file system crypttab passwords, or other information. (CVE-2012-4453 )
Run yum update dracut to update your system.