The PostgreSQL authentication modules (1) mod_auth_pgsql 0.9.5, and (2) mod_auth_pgsql_sys 0.9.4, allow remote attackers to bypass authentication and execute arbitrary SQL via a SQL injection attack on the user name.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7059
http://www.securityfocus.com/bid/3253
http://www.securityfocus.com/bid/3251
http://www.iss.net/security_center/static/7054.php
http://rhn.redhat.com/errata/RHSA-2001-124.html
http://marc.info/?l=bugtraq&m=99911895901812&w=2
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000427
http://archives.neohapsis.com/archives/vulnwatch/2001-q3/0040.html