This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
Details follow:
USN-542-1 fixed a vulnerability in poppler. This update provides the corresponding updates for KWord, part of KOffice.
Original advisory details:
Secunia Research discovered several vulnerabilities in poppler. If a user were tricked into loading a specially crafted PDF file, a remote attacker could cause a denial of service or possibly execute arbitrary code with the user's privileges in applications linked against poppler.
Solution: The problem can be corrected by upgrading your system to the following package versions:
Ubuntu 6.06 LTS: kword 1:1.5.0-0ubuntu9.3
Ubuntu 6.10: kword 1:1.5.2-0ubuntu2.3
Ubuntu 7.04: kword 1:1.6.2-0ubuntu1.2
Ubuntu 7.10: kword 1:1.6.3-0ubuntu5.1
After a standard system upgrade you need to restart KOffice to effect the necessary changes.