A logic error in the CRAM-MD5 code for the University of Washington IMAP (UW-IMAP) server, when Challenge-Response Authentication Mechanism with MD5 (CRAM-MD5) is enabled, does not properly enforce all the required conditions for successful authentication, which allows remote attackers to authenticate as arbitrary users.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11306
http://www.securityfocus.com/bid/12391
http://www.redhat.com/support/errata/RHSA-2005-128.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:026
http://www.kb.cert.org/vuls/id/CRDY-68QSL5
http://www.kb.cert.org/vuls/id/702777
http://www.gentoo.org/security/en/glsa/glsa-200502-02.xml
http://securitytracker.com/id?1013037