[NT] WebWasher Classic Error Message XSS Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 11/16/03

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Date: 16 Nov 2003 18:45:32 +0200

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      WebWasher Classic Error Message XSS Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.webwasher.com/client/home/index.html?lang=de_EN> WebWasher
    Classic, is WebWasher's easy-to-use and very effective Internet filter and
    assistant which runs on the client, a vulnerability in the product allows
    attackers to cause the product to return arbitrary HTML and/or JavaScript.

    DETAILS

    Vulnerable systems:
     * WebWasher version 3.3 Build 44
     * WebWasher version 2.2.1

    WebWasher Classic is vulnerable to a XSS attack. If a HTTP GET-Request,
    containing script code, is sent to the proxy port (default 8080/TCP), an
    error page is shown, which contains the requested URL in the message body.

    Thereby no validation of the requested URL, regarding script code, is
    done. It should be mentioned that if WebWasher proxy runs in server mode,
    the proxy port is accessible from the network. If WebWasher proxy runs in
    client mode, only connections from localhost are possible.

    Example:
    http://localhost:8080/< script>alert("WASH_ME")</script>

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:Oliver.Karow@gmx.de> Oliver
    Karow.

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