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WebWasher Classic - HTTP CONNECT weakness
=========================================
WebWasher Classic
=================
WebWasher Classic is a well known
HTTP-URL/Popup/Script filtering proxy
which
is free for non commercial use.
WebWasher Classic supports two modes, a client mode,
where it only works for
the local machine (bound to localhost) and a server
mode, where it serves as
a network proxy (bound to 0.0.0.0).
Weakness
========
If running in server mode, it is possible to connect
from remote to tcp
ports
listening on 127.0.0.1 of the WebWasher system. This
is an design flaw,
because CONNECT requests to localhost should be
denied.
It also may be possible to bypass accesslists of
firewalls, protecting the
WebWasher system.
Version
=======
WebWasher Classic v3.3 and v.2.2.1 on Windows platform.
Other platforms were not tested, but may also be
affected.
Exploiting/PoC
==============
1) Start a netcat listener on the WebWasher system:
netcat -L -p 99 -s 127.0.0.1 < hallo.txt
2) Connect to the WebWasher proxy port (default
8080/tcp)
3) Enter command "CONNECT 127.0.0.1:99 HTTP/1.0"
As a result, content of hallo.txt will appear.
Vendor:
=======
http://www.webwasher.com
(Webwasher belongs to CyberGuard)
Discovered
==========
by oliver karow
http://www.oliverkarow.de/research/WebWasherCONNECT.txt
--
Sparen beginnt mit GMX DSL:
http://www.gmx.net/de/go/dsl
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