Amazon Linux AMI Security Advisory: ALAS-2014-331
Advisory Release Date: 2014-04-25 16:00 Pacific
Advisory Updated Date: 2014-09-18 00:30 Pacific
It was found that the mod_dav module did not correctly strip leading white space from certain elements in a parsed XML. In certain httpd configurations that use the mod_dav module (for example when using the mod_dav_svn module), a remote attacker could send a specially crafted DAV request that would cause the httpd child process to crash or, possibly, allow the attacker to execute arbitrary code with the privileges of the "apache" user. (CVE-2013-6438)
A buffer over-read flaw was found in the httpd mod_log_config module. In configurations where cookie logging is enabled, a remote attacker could use this flaw to crash the httpd child process via an HTTP request with a malformed cookie header. (CVE-2014-0098)
Run yum update httpd to update your system.