The remote host is missing an update to pango1.0 announced via advisory DSA 2178-1.

The oldstable distribution (lenny) is not affected by this problem. For the stable distribution (squeeze), this problem has been fixed in version 1.28.3-1+squeeze2. For the testing distribution (wheezy) and the unstable distribution (sid), this problem will be fixed soon. We recommend that you upgrade your pango1.0 packages. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202178-1

It was discovered that pango did not check for memory allocation failures, causing a NULL pointer dereference with an adjustable offset. This can lead to application crashes and potentially arbitrary code execution.