Synopsis:    Critical: firefox security update
Issue Date:  2011-09-28
CVE Numbers: CVE-2011-2995
              CVE-2011-2999
              CVE-2011-3000
              CVE-2011-2372
              CVE-2011-2998


Mozilla Firefox is an open source web browser. XULRunner provides the 
XUL Runtime environment for Mozilla Firefox.

Several flaws were found in the processing of malformed web content. A 
web page containing malicious content could cause Firefox to crash or,
potentially, execute arbitrary code with the privileges of the user 
running Firefox. (CVE-2011-2995)

A flaw was found in the way Firefox processed the "Enter" keypress 
event. A malicious web page could present a download dialog while the 
key is pressed, activating the default "Open" action. A remote attacker 
could exploit this vulnerability by causing the browser to open 
malicious web content. (CVE-2011-2372)

A flaw was found in the way Firefox handled Location headers in redirect
responses. Two copies of this header with different values could be a
symptom of a CRLF injection attack against a vulnerable server. Firefox 
now treats two copies of the Location, Content-Length, or 
Content-Disposition header as an error condition. (CVE-2011-3000)

A flaw was found in the way Firefox handled frame objects with certain
names. An attacker could use this flaw to cause a plug-in to grant its
content access to another site or the local file system, violating the
same-origin policy. (CVE-2011-2999)

An integer underflow flaw was found in the way Firefox handled large
JavaScript regular expressions. A web page containing malicious 
JavaScript could cause Firefox to access already freed memory, causing 
Firefox to crash or, potentially, execute arbitrary code with the 
privileges of the user running Firefox. (CVE-2011-2998)

For technical details regarding these flaws, refer to the Mozilla 
security advisories for Firefox 3.6.23. You can find a link to the 
Mozilla advisories in the References section of this erratum.

All Firefox users should upgrade to these updated packages, which 
contain Firefox version 3.6.23, which corrects these issues. After 
installing the update, Firefox must be restarted for the changes to take 
effect.

SL4:
   i386
      firefox-3.6.23-1.el4.i386.rpm
      firefox-debuginfo-3.6.23-1.el4.i386.rpm
   x86_64
      firefox-debuginfo-3.6.23-1.el4.x86_64.rpm
      firefox-3.6.23-1.el4.x86_64.rpm
SL5:
   i386
      firefox-debuginfo-3.6.23-2.el5_7.i386.rpm
      xulrunner-devel-1.9.2.23-1.el5_7.i386.rpm
      xulrunner-debuginfo-1.9.2.23-1.el5_7.i386.rpm
      firefox-3.6.23-2.el5_7.i386.rpm
      xulrunner-1.9.2.23-1.el5_7.i386.rpm
   x86_64
      firefox-debuginfo-3.6.23-2.el5_7.i386.rpm
      firefox-debuginfo-3.6.23-2.el5_7.x86_64.rpm
      xulrunner-1.9.2.23-1.el5_7.i386.rpm
      xulrunner-1.9.2.23-1.el5_7.x86_64.rpm
      xulrunner-debuginfo-1.9.2.23-1.el5_7.i386.rpm
      xulrunner-devel-1.9.2.23-1.el5_7.x86_64.rpm
      xulrunner-debuginfo-1.9.2.23-1.el5_7.x86_64.rpm
      xulrunner-devel-1.9.2.23-1.el5_7.i386.rpm
      firefox-3.6.23-2.el5_7.i386.rpm
      firefox-3.6.23-2.el5_7.x86_64.rpm
SL6:
   i386
      xulrunner-devel-1.9.2.23-1.el6_1.1.i686.rpm
      firefox-3.6.23-2.el6_1.i686.rpm
      xulrunner-debuginfo-1.9.2.23-1.el6_1.1.i686.rpm
      xulrunner-1.9.2.23-1.el6_1.1.i686.rpm
      firefox-debuginfo-3.6.23-2.el6_1.i686.rpm
   x86_64
      xulrunner-debuginfo-1.9.2.23-1.el6_1.1.x86_64.rpm
      xulrunner-debuginfo-1.9.2.23-1.el6_1.1.i686.rpm
      xulrunner-devel-1.9.2.23-1.el6_1.1.i686.rpm
      firefox-3.6.23-2.el6_1.x86_64.rpm
      xulrunner-1.9.2.23-1.el6_1.1.x86_64.rpm
      xulrunner-1.9.2.23-1.el6_1.1.i686.rpm
      firefox-debuginfo-3.6.23-2.el6_1.x86_64.rpm
      firefox-debuginfo-3.6.23-2.el6_1.i686.rpm
      firefox-3.6.23-2.el6_1.i686.rpm
      xulrunner-devel-1.9.2.23-1.el6_1.1.x86_64.rpm

- Scientific Linux Development Team