Multiple security issues have been found in Icedove, Debian"s version of the Mozilla Thunderbird mail and news client: Multiple memory safety errors, buffer overflows, use-after-frees and other implementation errors may lead to the execution of arbitrary code or denial of service. This update updates Iceweasel to the ESR31 series of Thunderbird. In addition Enigmail was updated to version 1.7.2-1~deb7u1 to ensure compatibility with the new upstream release.