The remote host is missing an update to ruby1.8, ruby1.9 announced via advisory DSA 1695-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201695-1

The regular expression engine of Ruby, a scripting language, contains a memory leak which can be triggered remotely under certain circumstances, leading to a denial of service condition (CVE-2008-3443). In addition, this security update addresses a regression in the REXML XML parser of the ruby1.8 package the regression was introduced in DSA-1651-1. For the stable distribution (etch), this problem has been fixed in version 1.8.5-4etch4 of the ruby1.8 package, and version 1.9.0+20060609-1etch4 of the ruby1.9 package. For the unstable distribution (sid), this problem has been fixed in version 1.8.7.72-1 of the ruby1.8 package. The ruby1.9 package will be fixed soon. We recommend that you upgrade your Ruby packages.