USN-493-1: Firefox vulnerabilities

Ubuntu Security Notice USN-493-1

31st July, 2007

firefox vulnerabilities

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

  • Ubuntu 7.04
  • Ubuntu 6.10
  • Ubuntu 6.06 LTS


A flaw was discovered in handling of "about:blank" windows used by
addons. A malicious web site could exploit this to modify the contents,
or steal confidential data (such as passwords), of other web pages.

Jesper Johansson discovered that spaces and double-quotes were
not correctly handled when launching external programs. In rare
configurations, after tricking a user into opening a malicious web page,
an attacker could execute helpers with arbitrary arguments with the
user's privileges. (CVE-2007-3845)

Update instructions

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

Ubuntu 7.04:
Ubuntu 6.10:
Ubuntu 6.06 LTS:
firefox 1.5.dfsg+

To update your system, please follow these instructions:

After a standard system upgrade you need to restart Firefox to effect
the necessary changes.


CVE-2007-3844, CVE-2007-3845