The remote host is missing an update to trousers announced via advisory DSA 2576-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202576-1

Andy Lutomirski discovered that tcsd (the TPM userspace daemon) was missing a of input validation. Using carefully crafted input, it can lead to a denial of service by making the daemon crash with a segmentation fault. For the stable distribution (squeeze), this problem has been fixed in version 0.3.5-2+squeeze1. For the testing distribution (wheezy), this problem has been fixed in version 0.3.9-1. For the unstable distribution (sid), this problem has been fixed in version 0.3.9-1. We recommend that you upgrade your trousers packages.