The remote host is missing updates announced in advisory TSLSA-2007-0015.
postgresql < TSL 3.0.5 > < TSL 3.0 > < TSL 2.2 > < TSEL 2 > - New upstream. - SECURITY Fix: A vulnerability has been identified, which could be exploited by malicious users to obtain elevated privileges. This issue is caused by an insecure search_path settings, which could be exploited by unprivileged users to gain the SQL privileges of the owner of any SECURITY DEFINER function they are allowed to call
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2007-2138 to this issue.
Solution: Update your system with the packages as indicated in the referenced security advisory.