The Auth API in ProFTPD before 20070417, when multiple simultaneous authentication modules are configured, does not require that the module that checks authentication is the same as the module that retrieves authentication data, which might allow remote attackers to bypass authentication, as demonstrated by use of SQLAuthTypes Plaintext in mod_sql, with data retrieved from /etc/passwd.
https://www.redhat.com/archives/fedora-package-announce/2007-November/msg00065.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/33733
https://bugzilla.redhat.com/show_bug.cgi?id=237533
http://www.vupen.com/english/advisories/2007/1444
http://www.securityfocus.com/bid/23546
http://www.mandriva.com/security/advisories?name=MDKSA-2007:130
http://securitytracker.com/id?1017931
http://secunia.com/advisories/27516
http://secunia.com/advisories/25724
http://secunia.com/advisories/24867