Mozilla Firefox is an open source web browser.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-2010-1121, CVE-2010-1200, CVE-2010-1202, CVE-2010-1203)A flaw was found in the way browser plug-ins interact. It was possible fora plug-in to reference the freed memory from a different plug-in, resultingin the execution of arbitrary code with the privileges of the user runningFirefox. (CVE-2010-1198)Several integer overflow flaws were found in the processing of malformedweb content. A web page containing malicious content could cause Firefox tocrash or, potentially, execute arbitrary code with the privileges of theuser running Firefox. (CVE-2010-1196, CVE-2010-1199)A focus stealing flaw was found in the way Firefox handled focus changes. Amalicious website could use this flaw to steal sensitive data from a user,such as usernames and passwords. (CVE-2010-1125)A flaw was found in the way Firefox handled the "Content-Disposition:attachment" HTTP header when the "Content-Type: multipart" HTTP header wasalso present. A website that allows arbitrary uploads and relies on the"Content-Disposition: attachment" HTTP header to prevent content from beingdisplayed inline, could be used by an attacker to serve malicious contentto users. (CVE-2010-1197)A flaw was found in the Firefox Math.random() function. This function couldbe used to identify a browsing session and track a user across differentwebsites. (CVE-2008-5913)A flaw was found in the Firefox XML document loading security checks.Certain security checks were not being called when an XML document wasloaded. This could possibly be leveraged later by an attacker to loadcertain resources that violate the security policies of the browser or itsadd-ons. Note that this issue cannot be exploited by only loading an XMLdocument. (CVE-2010-0182)For technical details regarding these flaws, refer to the Mozilla securityadvisories for Firefox 3.6.4. You can find a link to the Mozilla advisoriesin the References section of this erratum.This erratum upgrades Firefox from version 3.0.19 to version 3.6.4. Due tothe requirements of Firefox 3.6.4, this erratum also provides a number ofother updated packages, including esc, totem, and yelp.This erratum also contains multiple bug fixes and numerous enhancements.Space precludes documenting these changes in this advisory. For detailsconcerning these changes, refer to the Firefox Release Notes links in theReferences section of this erratum.Important: Firefox 3.6.4 is not completely backwards-compatible with allMozilla Add-ons and Firefox plug-ins that worked with Firefox 3.0.19.Firefox 3.6 checks compatibility on first-launch, and, depending on theindividual configuration and the installed Add-ons and plug-ins, maydisable said Add-ons and plug-ins, or attempt to check for updates andupgrade them. Add-ons and plug-ins may have to be manually updated.All Firefox users should upgrade to these updated packages, which containFirefox version 3.6.4. After installing the update, Firefox must berestarted for the changes to take effect.