The remote host is missing an update to tomcat4 announced via advisory DSA 225-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20225-1

A security vulnerability has been confirmed to exist in Apache Tomcat 4.0.x releases, which allows to use a specially crafted URL to return the unprocessed source of a JSP page, or, under special circumstances, a static resource which would otherwise have been protected by a security constraint, without the need for being properly authenticated. This is based on a variant of the exploit that was identified as CVE-2002-1148. For the current stable distribution (woody) this problem has been fixed in version 4.0.3-3woody2. The old stable distribution (potato) does not contain tomcat packages. For the unstable distribution (sid) this problem does not exist in the current version 4.1.16-1. We recommend that you upgrade your tomcat packages.