Please Install the Updated Packages.
It was discovered that the mod_rewrite module incorrectly sanitized non- printable characters before writing data to log files. A remote attacker could possibly use this flaw to execute arbitrary commands by injecting escape sequences in the log file. (CVE-2013-1862) It was discovered that the mod_dav module incorrectly handled certain MERGE requests. A remote attacker could use this issue to cause the server to stop responding, resulting in a denial of service. (CVE-2013-1896)
apache2 on Ubuntu 13.04 , Ubuntu 12.10 , Ubuntu 12.04 LTS , Ubuntu 10.04 LTS