CVE-2013-6171 Information

Description

checkpassword-reply in Dovecot before 2.2.7 performs setuid operations to a user who is authenticating which allows local users to bypass authentication and access virtual email accounts by attaching to the process and using a restricted file descriptor to modify account information in the response to the dovecot-auth server.

Reference

http://cpanel.net/tsr-2013-0010-full-disclosure/ http://secunia.com/advisories/54808 http://wiki2.dovecot.org/AuthDatabase/CheckPasswordSecurity http://www.dovecot.org/list/dovecot-news/2013-November/000264.html https://usn.ubuntu.com/3556-2/