The remote host is missing an update to heartbeat announced via advisory DSA 761-2. The security update DSA 761-1 for pdns contained a bug which caused a regression. This problem is corrected with this advisory. For completeness below please find the original advisory text: Eric Romang discovered several insecure temporary file creations in heartbeat, the subsystem for High-Availability Linux.

For the stable distribution (sarge) these problems have been fixed in version 1.2.3-9sarge3. We recommend that you upgrade your heartbeat package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20761-2