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VID 22075
Severity 30
Port 8080, ...
Protocol TCP
Class Webproxy
Detailed Description The proxy allows the users to perform CONNECT requests like

CONNECT http://taget.com:23

This request give to the person who make it the ability to have an interactive session.
This problem may allow attackers to go through your firewall, by connecting to sensitive ports like 23 (telnet) using your proxy, or it can allow internal users to bypass the firewall rules and connect to ports they should not be allowed to.
In addition to that, your proxy may be used to perform attacks against other networks.

* References:
http://cgi.nessus.org/plugins/dump.php3?id=10192
http://www.securityspace.com/smysecure/catid.html?id=10192
Recommendation reconfigure your proxy so that it refuses CONNECT requests.
Related URL (CVE)
Related URL (SecurityFocus)
Related URL (ISS)