The remote host is missing an update to systemtap announced via advisory DSA 2348-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202348-1

Several vulnerabilities were discovered in SystemTap, an instrumentation system for Linux: CVE-2011-2503 It was discovered that a race condition in staprun could lead to privilege escalation. CVE-2010-4170 It was discovered that insufficient validation of environment variables in staprun could lead to privilege escalation. CVE-2010-4171 It was discovered that insufficient validation of module unloading could lead to denial of service. For the stable distribution (squeeze), this problem has been fixed in version 1.2-5+squeeze1. For the unstable distribution (sid), this problem has been fixed in version 1.6-1. We recommend that you upgrade your systemtap packages.