The remote host is missing an update to koffice announced via advisory DSA 1019-1. Derek Noonburg has fixed several potential vulnerabilities in xpdf, the Portable Document Format (PDF) suite, which is also present in koffice, the KDE Office Suite. The old stable distribution (woody) does not contain kpdf packages.
For the stable distribution (sarge) these problems have been fixed in version 1.3.5-4.sarge.3. For the unstable distribution (sid) these problems will be fixed soon. We recommend that you upgrade your kpdf package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201019-1