USN-443-1: Firefox vulnerability

Ubuntu Security Notice USN-443-1

27th March, 2007

firefox vulnerability

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

  • Ubuntu 6.10
  • Ubuntu 6.06 LTS
  • Ubuntu 5.10


A flaw was discovered in how Firefox handled PASV FTP responses. If a
user were tricked into visiting a malicious FTP server, a remote
attacker could perform a port-scan of machines within the user's
network, leading to private information disclosure.

Update instructions

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

Ubuntu 6.10:
Ubuntu 6.06 LTS:
firefox 1.5.dfsg+
Ubuntu 5.10:
firefox 1.5.dfsg+

To update your system, please follow these instructions:

After a standard system upgrade you need to restart Firefox or reboot
your computer to effect the necessary changes.