The default configuration of University of Washington IMAP daemon (wu-imapd), when running on a system that does not allow shell access, allows a local user with a valid IMAP account to read arbitrary files as that user.
https://exchange.xforce.ibmcloud.com/vulnerabilities/9238
http://www.washington.edu/imap/IMAP-FAQs/index.html#5.1
http://www.securityfocus.com/bid/4909