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==========================================================================
Ubuntu Security Notice USN-1210-1
September 28, 2011

firefox, xulrunner-1.9.2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

Multiple vulnerabilities have been fixed in Firefox and Xulrunner.

Software Description:
- firefox: Mozilla Open Source web browser
- xulrunner-1.9.2: Mozilla Gecko runtime environment

Details:

Benjamin Smedberg, Bob Clary, Jesse Ruderman, and Josh Aas discovered
multiple memory vulnerabilities in the browser rendering engine. An
attacker could use these to possibly execute arbitrary code with the
privileges of the user invoking Firefox. (CVE-2011-2995, CVE-2011-2996)

Boris Zbarsky discovered that a frame named "location" could shadow the
window.location object unless a script in a page grabbed a reference to the
true object before the frame was created. This is in violation of the Same
Origin Policy. A malicious website could possibly use this to access
another website or the local file system. (CVE-2011-2999)

Mark Kaplan discovered an integer underflow in the SpiderMonkey JavaScript
engine. An attacker could potentially use this to crash Firefox.

Ian Graham discovered that when multiple Location headers were present,
Firefox would use the second one resulting in a possible CRLF injection
attack. CRLF injection issues can result in a wide variety of attacks, such
as XSS (Cross-Site Scripting) vulnerabilities, browser cache poisoning, and
cookie theft. (CVE-2011-3000)

Mariusz Mlynski discovered that if the user could be convinced to hold down
the enter key, a malicious website could potential pop up a download dialog
and the default open action would be selected. This would result in
potentially malicious content being run with privileges of the user
invoking Firefox. (CVE-2011-2372)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 10.10:
  firefox                         3.6.23+build1+nobinonly-0ubuntu0.10.10.1
  xulrunner-1.9.2                 1.9.2.23+build1+nobinonly-0ubuntu0.10.10.1

Ubuntu 10.04 LTS:
  firefox                         3.6.23+build1+nobinonly-0ubuntu0.10.04.1
  xulrunner-1.9.2                 1.9.2.23+build1+nobinonly-0ubuntu0.10.04.1

After a standard system upgrade you need to restart Firefox and any
applications that use Xulrunner to effect the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1210-1
  CVE-2011-2372, CVE-2011-2995, CVE-2011-2996, CVE-2011-2999,
  CVE-2011-3000, CVE-2011-3001

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/3.6.23+build1+nobinonly-0ubuntu0.10.10.1
  https://launchpad.net/ubuntu/+source/xulrunner-1.9.2/1.9.2.23+build1+nobinonly-0ubuntu0.10.10.1
  https://launchpad.net/ubuntu/+source/firefox/3.6.23+build1+nobinonly-0ubuntu0.10.04.1
  https://launchpad.net/ubuntu/+source/xulrunner-1.9.2/1.9.2.23+build1+nobinonly-0ubuntu0.10.04.1



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