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-2016-1952, CVE-2016-1954, CVE-2016-1957, CVE-2016-1958,CVE-2016-1960, CVE-2016-1961, CVE-2016-1962, CVE-2016-1973, CVE-2016-1974,CVE-2016-1964, CVE-2016-1965, CVE-2016-1966)Multiple security flaws were found in the graphite2 font library shippedwith Firefox. A web page containing malicious content could cause Firefoxto crash or, potentially, execute arbitrary code with the privileges of theuser running Firefox. (CVE-2016-1977, CVE-2016-2790, CVE-2016-2791,CVE-2016-2792, CVE-2016-2793, CVE-2016-2794, CVE-2016-2795, CVE-2016-2796,CVE-2016-2797, CVE-2016-2798, CVE-2016-2799, CVE-2016-2800, CVE-2016-2801,CVE-2016-2802)Red Hat would like to thank the Mozilla project for reporting these issues.Upstream acknowledges Bob Clary, Christoph Diehl, Christian Holler, AndrewMcCreight, Daniel Holbert, Jesse Ruderman, Randell Jesup, NicolasGolubovic, Jose Martinez, Romina Santillan, Abdulrahman Alqabandi,ca0nguyen, lokihardt, Dominique Hazaël-Massieux, Nicolas Grégoire, TsubasaIinuma, the Communications Electronics Security Group (UK) of the GCHQ,Holger Fuhrmannek, Ronald Crane, and Tyson Smith as the original reportersof these issues.All Firefox users should upgrade to these updated packages, which containFirefox version 38.7.0 ESR, which corrects these issues. After installingthe update, Firefox must be restarted for the changes to take effect.