USN-877-1: Firefox 3.0 and Xulrunner 1.9 regression

8 January 2010

firefox-3.0, xulrunner-1.9 regression

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


USN-873-1 fixed vulnerabilities in Firefox and Xulrunner. The upstream changes introduced a regression when using NTLM authentication. This update fixes the problem and adds additional stability fixes.

We apologize for the inconvenience.

Original advisory details:

Jesse Ruderman, Josh Soref, Martijn Wargers, Jose Angel, Olli Pettay, and David James discovered several flaws in the browser and JavaScript engines of Firefox. If a user were tricked into viewing a malicious website, a remote attacker could cause a denial of service or possibly execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-3979, CVE-2009-3981, CVE-2009-3986)

Takehiro Takahashi discovered flaws in the NTLM implementation in Firefox. If an NTLM authenticated user visited a malicious website, a remote attacker could send requests to other applications, authenticated as the user. (CVE-2009-3983)

Jonathan Morgan discovered that Firefox did not properly display SSL indicators under certain circumstances. This could be used by an attacker to spoof an encrypted page, such as in a phishing attack. (CVE-2009-3984)

Jordi Chancel discovered that Firefox did not properly display invalid URLs for a blank page. 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. (CVE-2009-3985)

Update instructions

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

Ubuntu 9.04
abrowser - 3.0.17+nobinonly-0ubuntu0.9.04.1
firefox-3.0 - 3.0.17+nobinonly-0ubuntu0.9.04.1
xulrunner-1.9 -
Ubuntu 8.10
abrowser - 3.0.17+nobinonly-0ubuntu0.8.10.1
firefox-3.0 - 3.0.17+nobinonly-0ubuntu0.8.10.1
xulrunner-1.9 -
Ubuntu 8.04 LTS
firefox-3.0 - 3.0.17+nobinonly-0ubuntu0.8.04.1
xulrunner-1.9 -

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.