The mod_perl initialization script in Bugzilla 2.23.3 does not set the Bugzilla Apache configuration to allow .htaccess permissions to override file permissions, which allows remote attackers to obtain the database username and password via a direct request for the localconfig file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/32252
http://www.vupen.com/english/advisories/2007/0477
http://www.securityfocus.com/bid/22380
http://www.securityfocus.com/archive/1/459025/100/0/threaded
http://www.bugzilla.org/security/2.20.3/
http://securitytracker.com/id?1017585