The remote host is missing an update to otrs2 announced via advisory DSA 1298-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201298-1

It was discovered that the Open Ticket Request System performs insufficient input sanitising for the Subaction parameter, which allows the injection of arbitrary web script code. The oldstable distribution (sarge) doesn't include otrs2. For the stable distribution (etch) this problem has been fixed in version 2.0.4p01-18. The unstable distribution (sid) isn't affected by this problem. We recommend that you upgrade your otrs2 package.