Amazon Linux AMI Security Advisory: ALAS-2012-33
Advisory Release Date: 2014-09-14 15:10 Pacific
A stack-based buffer overflow flaw was found in the way ICU performed variant canonicalization for some locale identifiers. If a specially-crafted locale representation was opened in an application linked against ICU, it could cause the application to crash or, possibly, execute arbitrary code with the privileges of the user running the application. (CVE-2011-4599 )
Run yum update icu to update your system.