CVE-2025-50949 FontForge DlgCreate8组件内存泄漏漏洞

// CVE-2025-50949 PoC - FontForge DlgCreate8 Memory Leak // This PoC demonstrates triggering the memory leak in FontForge's DlgCreate8 component #include <windows.h> #include <stdio.h> // Simulated DlgCreate8 function with memory leak void* DlgCreate8(const char* resource_id) { void* dialog_handle = malloc(1024); // Allocate memory for dialog void* control_data = malloc(512); // Additional allocation // Memory leak: control_data is never freed // Correct implementation should free both allocations printf("[+] Created dialog with resource: %s\n", resource_id); printf("[+] Dialog handle: %p\n", dialog_handle); printf("[+] Control data: %p (LEAKED)\n", control_data); return dialog_handle; } void DlgDestroy8(void* handle) { // Only frees the main handle, leaks control_data if (handle) { free(handle); printf("[-] Destroyed dialog handle: %p\n", handle); } } int main() { printf("=== CVE-2025-50949 FontForge Memory Leak PoC ===\n\n"); // Simulate repeated dialog creation/destruction for (int i = 0; i < 10; i++) { void* handle = DlgCreate8("malicious_font_resource"); Sleep(100); DlgDestroy8(handle); printf("[*] Iteration %d complete, 512 bytes leaked\n\n", i + 1); } printf("[!] Total memory leaked: ~5KB\n"); printf("[!] In real attack, repeated triggering leads to DoS\n"); return 0; }