The remote host is missing an update to postgresql-8.4 announced via advisory DSA 2491-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202491-1

Two vulnerabilities were discovered in PostgreSQL, an SQL database server: CVE-2012-2143 The crypt(text, text) function in the pgcrypto contrib module did not handle certain passwords correctly, ignoring characters after the first character which does not fall into the ASCII range. CVE-2012-2655 SECURITY DEFINER and SET attributes for a call handler of a procedural language could crash the database server. In addition, this update contains reliability and stability fixes from the 8.4.12 upstream release. For the stable distribution (squeeze), this problem has been fixed in version 8.4.12-0squeeze1. For the unstable distribution (sid), this problem has been fixed in version 8.4.12-1. We recommend that you upgrade your postgresql-8.4 packages.