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 malformed web content. A web
page containing malicious content could cause an application linked against
XULRunner (such as Mozilla Firefox) to crash or execute arbitrary code with
the privileges of the user running the application. (CVE-2013-0787)

Red Hat would like to thank the Mozilla project for reporting this issue.
Upstream acknowledges VUPEN Security via the TippingPoint Zero Day
Initiative project as the original reporter.

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.

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

918876 - CVE-2013-0787 Mozilla: Use-after-free in HTML Editor (MFSA 2013-29)

https://www.redhat.com/security/data/cve/CVE-2013-0787.html
https://access.redhat.com/security/updates/classification/#critical
http://www.mozilla.org/security/known-vulnerabilities/firefoxESR.html