The remote host is missing an update to pam-pgsql announced via advisory DSA 2173-1.

For the oldstable distribution (lenny), this problem has been fixed in version 0.6.3-2+lenny1. For the stable distribution (squeeze), this problem has been fixed in version 0.7.1-4+squeeze1. For the testing (wheezy) and unstable (sid) distributions, this problem has been fixed in version 0.7.1-5. We recommend that you upgrade your pam-pgsql packages. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202173-1

It was discovered that pam-pgsql, a PAM module to authenticate using a PostgreSQL database, was vulnerable to a buffer overflow in supplied IP-addresses.