Critical: xulrunner security update

Updated xulrunner packages that fix one security issue are now available
for Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as having critical
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

XULRunner provides the XUL Runtime environment for applications using the
Gecko layout engine.

A flaw was found in the way XULRunner handled security wrappers. A web page
containing malicious content could possibly cause an application linked
against XULRunner (such as Mozilla Firefox) to execute arbitrary code with
the privileges of the user running the application. (CVE-2012-4193)

For technical details regarding this flaw, refer to the Mozilla security
advisories. You can find a link to the Mozilla advisories in the References
section of this erratum.

Red Hat would like to thank the Mozilla project for reporting this issue.
Upstream acknowledges moz_bug_r_a4 as the original reporter.

All XULRunner users should upgrade to these updated packages, which correct
this issue. After installing the update, applications using XULRunner 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
https://access.redhat.com/knowledge/articles/11258

865215 - CVE-2012-4193 Mozilla: defaultValue security checks not applied (MFSA 2012-89)

https://www.redhat.com/security/data/cve/CVE-2012-4193.html
https://access.redhat.com/security/updates/classification/#critical
http://www.mozilla.org/security/known-vulnerabilities/firefoxESR.html