USN-1251-1: Firefox and Xulrunner vulnerabilities

10 November 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


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


It was discovered that CVE-2011-3004, which addressed possible privilege escalation in addons, also affected Firefox 3.6. An attacker could potentially exploit Firefox when an add-on was installed that used loadSubscript in vulnerable ways. (CVE-2011-3647)

Yosuke Hasegawa discovered that the Mozilla browser engine mishandled invalid sequences in the Shift-JIS encoding. A malicious website could possibly use this flaw this to steal data or inject malicious scripts into web content. (CVE-2011-3648)

Marc Schoenefeld discovered that using Firebug to profile a JavaScript file with many functions would cause Firefox to crash. An attacker might be able to exploit this without using the debugging APIs which would potentially allow an attacker to remotely crash the browser. (CVE-2011-3650)

Update instructions

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

Ubuntu 10.10
firefox - 3.6.24+build2+nobinonly-0ubuntu0.10.10.1
xulrunner-1.9.2 -
Ubuntu 10.04 LTS
firefox - 3.6.24+build2+nobinonly-0ubuntu0.10.04.1
xulrunner-1.9.2 -

To update your system, please follow these instructions:

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