Amazon Linux AMI Security Advisory: ALAS-2014-276
Advisory Release Date: 2014-09-16 22:18 Pacific
Varnish before 3.0.5 allows remote attackers to cause a denial of service (child-process crash and temporary caching outage) via a GET request with trailing whitespace characters and no URI.
varnish 3.0.3 uses world-readable permissions for the /var/log/varnish/ directory and the log files in the directory, which allows local users to obtain sensitive information by reading the files. NOTE: some of these details are obtained from third party information.
Run yum update varnish to update your system.