DBMail before 2.2.9, when using authldap with an LDAP server that supports anonymous login such as Active Directory, allows remote attackers to bypass authentication via an empty password, which causes the LDAP bind to indicate success based on anonymous authentication.
https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00585.html
https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00549.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/41907
http://www.vupen.com/english/advisories/2008/1321/references
http://www.securitytracker.com/id?1019914
http://www.securityfocus.com/bid/28849
http://www.mail-archive.com/dbmail-dev%40dbmail.org/msg09942.html
http://www.gentoo.org/security/en/glsa/glsa-200804-24.xml
http://secunia.com/advisories/29984
http://secunia.com/advisories/29937