Critical: firefox security and bug fix update

Updated firefox packages that fix several security issues and one bug are
now available for Red Hat Enterprise Linux 4, 5, and 6.

The Red Hat Security Response Team has rated this update as having critical
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

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

A flaw was found in the way Firefox sanitized HTML content in extensions.
If an extension loaded or rendered malicious content using the
ParanoidFragmentSink class, it could fail to safely display the content,
causing Firefox to execute arbitrary JavaScript with the privileges of the
user running Firefox. (CVE-2010-1585)

A flaw was found in the way Firefox handled dialog boxes. An attacker could
use this flaw to create a malicious web page that would present a blank
dialog box that has non-functioning buttons. If a user closes the dialog
box window, it could unexpectedly grant the malicious web page elevated
privileges. (CVE-2011-0051)

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-2011-0053, CVE-2011-0055, CVE-2011-0058, CVE-2011-0062)

Several flaws were found in the way Firefox handled malformed JavaScript. A
website containing malicious JavaScript could cause Firefox to execute that
JavaScript with the privileges of the user running Firefox. (CVE-2011-0054,
CVE-2011-0056, CVE-2011-0057)

A flaw was found in the way Firefox handled malformed JPEG images. A
website containing a malicious JPEG image could cause Firefox to crash or,
potentially, execute arbitrary code with the privileges of the user running
Firefox. (CVE-2011-0061)

A flaw was found in the way Firefox handled plug-ins that perform HTTP
requests. If a plug-in performed an HTTP request, and the server sent a 307
redirect response, the plug-in was not notified, and the HTTP request was
forwarded. The forwarded request could contain custom headers, which could
result in a Cross Site Request Forgery attack. (CVE-2011-0059)

For technical details regarding these flaws, refer to the Mozilla security
advisories for Firefox 3.6.14. You can find a link to the Mozilla
advisories in the References section of this erratum.

This update also fixes the following bug:

* On Red Hat Enterprise Linux 4 and 5, running the "firefox
-setDefaultBrowser" command caused warnings such as the following:

libgnomevfs-WARNING **: Deprecated function. User modifications to the
MIME database are no longer supported.

This update disables the "setDefaultBrowser" option. Red Hat Enterprise
Linux 4 users wishing to set a default web browser can use Applications ->
Preferences -> More Preferences -> Preferred Applications. Red Hat
Enterprise Linux 5 users can use System -> Preferences -> Preferred
Applications. (BZ#463131, BZ#665031)

All Firefox users should upgrade to these updated packages, which contain
Firefox version 3.6.14, which corrects these issues. After installing the
update, Firefox must be restarted for the changes to take effect.

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

463131 - libgnomevfs-WARNING when making firefox as default browser
665031 - firefox -setDefaultBrowser throws warnings
675082 - CVE-2011-0053 Mozilla miscellaneous memory safety hazards (MFSA 2011-01)
675083 - CVE-2011-0062 Mozilla miscellaneous memory safety hazards (MFSA 2011-01)
675087 - CVE-2011-0051 Mozilla recursive eval call causes confirm dialog to evaluate to true (MFSA 2011-02)
675090 - CVE-2011-0055 Mozilla use-after-free error in JSON.stringify (MFSA2011-03)
675091 - CVE-2011-0054 Mozilla Buffer overflow in JavaScript upvarMap (MFSA 2011-04)
675092 - CVE-2011-0056 Mozilla Buffer overflow in JavaScript atom map (MFSA 2011-05)
675093 - CVE-2011-0057 Mozilla use-after-free error using Web Workers (MFSA 2011-06)
675094 - CVE-2010-1585 Mozilla ParanoidFragmentSink allows javascript: URLs in chrome documents (MFSA 2011-08)
675095 - CVE-2011-0061 Mozilla crash caused by corrupted JPEG image (MFSA 2011-09)
675143 - CVE-2011-0058 Mozilla memory corruption during text run construction (MFSA 2011-07)
681369 - CVE-2011-0059 Mozilla CSRF risk with plugins and 307 redirects (MFSA 2011-10)

https://www.redhat.com/security/data/cve/CVE-2010-1585.html
https://www.redhat.com/security/data/cve/CVE-2011-0051.html
https://www.redhat.com/security/data/cve/CVE-2011-0053.html
https://www.redhat.com/security/data/cve/CVE-2011-0054.html
https://www.redhat.com/security/data/cve/CVE-2011-0055.html
https://www.redhat.com/security/data/cve/CVE-2011-0056.html
https://www.redhat.com/security/data/cve/CVE-2011-0057.html
https://www.redhat.com/security/data/cve/CVE-2011-0058.html
https://www.redhat.com/security/data/cve/CVE-2011-0059.html
https://www.redhat.com/security/data/cve/CVE-2011-0061.html
https://www.redhat.com/security/data/cve/CVE-2011-0062.html
https://access.redhat.com/security/updates/classification/#critical
http://www.mozilla.org/security/known-vulnerabilities/firefox36.html#firefox3.6.14