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-2014-8634, CVE-2014-8639, CVE-2014-8641)It was found that the Beacon interface implementation in Firefox did notfollow the Cross-Origin Resource Sharing (CORS) specification. A web pagecontaining malicious content could allow a remote attacker to conduct aCross-Site Request Forgery (XSRF) attack. (CVE-2014-8638)Red Hat would like to thank the Mozilla project for reporting these issues.Upstream acknowledges Christian Holler, Patrick McManus, Muneaki Nishimura,Xiaofeng Zheng, and Mitchell Harper as the original reporters of theseissues.For technical details regarding these flaws, refer to the Mozilla securityadvisories for Firefox 31.4.0 ESR. You can find a link to the Mozillaadvisories in the References section of this erratum.This update also fixes the following bug:All Firefox users should upgrade to these updated packages, which containFirefox version 31.4.0 ESR, which corrects these issues. After installingthe update, Firefox must be restarted for the changes to take effect.