The remote host is missing an update to php4 announced via advisory DSA 729-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20729-1

An iDEFENSE researcher discovered two problems in the image processing functions of PHP, a server-side, HTML-embedded scripting language, of which one is present in woody as well. When reading a JPEG image, PHP can be tricked into an endless loop due to insufficient input validation. For the stable distribution (woody) this problem has been fixed in version 4.1.2-7.woody4. For the testing distribution (sarge) these problems have been fixed in version 4.3.10-10. For the unstable distribution (sid) these problems have been fixed in version 4.3.10-10. We recommend that you upgrade your php4 packages.