Mozilla Firefox is an open source web browser. XULRunner provides the XULRuntime environment for Mozilla Firefox.Several flaws were found in the processing of malformed web content. A webpage containing malicious content could cause Firefox to crash or,potentially, execute arbitrary code with the privileges of the user runningFirefox. (CVE-2015-2708, CVE-2015-0797, CVE-2015-2710, CVE-2015-2713)A heap-based buffer overflow flaw was found in the way Firefox processedcompressed XML data. An attacker could create specially crafted compressedXML content that, when processed by Firefox, could cause it to crash orexecute arbitrary code with the privileges of the user running Firefox.(CVE-2015-2716)Red Hat would like to thank the Mozilla project for reporting these issues.Upstream acknowledges Jesse Ruderman, Mats Palmgren, Byron Campen, SteveFink, Aki Helin, Atte Kettunen, Scott Bell, and Ucha Gobejishvili as theoriginal reporters of these issues.All Firefox users should upgrade to these updated packages, which containFirefox version 38.0 ESR, which corrects these issues. After installing theupdate, Firefox must be restarted for the changes to take effect.