The remote host is missing an update to cups-pk-helper announced via advisory DSA 2562-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202562-1

cups-pk-helper, a PolicyKit helper to configure cups with fine-grained privileges, wraps CUPS function calls in an insecure way. This could lead to uploading sensitive data to a cups resource, or overwriting specific files with the content of a cups resource. The user would have to explicitly approve the action. For the stable distribution (squeeze), this problem has been fixed in version 0.1.0-3. For the testing distribution (wheezy), this problem will be fixed soon. For the unstable distribution (sid), this problem has been fixed in version 0.2.3-1. We recommend that you upgrade your cups-pk-helper packages.