The remote host is missing an update to dia announced via advisory DSA 1025-1. infamous41md discovered three buffer overflow errors in the xfig import code of dia, a diagram editor, that can lead to the execution of arbitrary code. For the old stable distribution (woody) these problems have been fixed in version 0.88.1-3woody1.
For the stable distribution (sarge) these problems have been fixed in version 0.94.0-7sarge3. For the unstable distribution (sid) these problems have been fixed in version 0.94.0-18. We recommend that you upgrade your dia package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201025-1