USN-811-1: Firefox and Xulrunner vulnerability

Ubuntu Security Notice USN-811-1

7th August, 2009

firefox-3.0, xulrunner-1.9 vulnerability

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

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS

Software description

  • firefox-3.0
  • xulrunner-1.9


Juan Pablo Lopez Yacubian discovered that Firefox did not properly display
invalid URLs. If a user were tricked into accessing a malicious website, an
attacker could exploit this to spoof the location bar, such as in a
phishing attack. Furthermore, if the malicious website had a valid SSL
certificate, Firefox would display the spoofed page as trusted.

Update instructions

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

Ubuntu 9.04:
firefox-3.0 3.0.13+nobinonly-0ubuntu0.9.04.1
abrowser 3.0.13+nobinonly-0ubuntu0.9.04.1
Ubuntu 8.10:
firefox-3.0 3.0.13+nobinonly-0ubuntu0.8.10.1
abrowser 3.0.13+nobinonly-0ubuntu0.8.10.1
Ubuntu 8.04 LTS:
firefox-3.0 3.0.13+nobinonly-0ubuntu0.8.04.1

To update your system, please follow these instructions:

After a standard system upgrade you need to restart Firefox and any
applications that use xulrunner, such as Epiphany, to effect the necessary