CVE-2026-41431 Zen Browser更新机制代码执行漏洞

#!/usr/bin/env python3 """ Conceptual PoC for CVE-2026-41431 This script simulates the vulnerable updater behavior where signature verification is skipped. In a real scenario, an attacker would serve a malicious MAR file instead of a legitimate one. """ import os def vulnerable_updater_check(mar_file_path): """ Simulates the vulnerable updater logic. It checks if the file exists but does NOT verify cryptographic signatures. """ print(f"[+] Checking for update: {mar_file_path}") if os.path.exists(mar_file_path): print("[!] Update file found.") # VULNERABILITY: Missing signature verification step # Secure code would be: if not verify_mar_signature(mar_file_path): return False print("[!] Skipping signature verification (VULNERABLE)") print("[+] Applying update...") # Simulating arbitrary code execution from the update print("[!!!] Executing unsigned code from MAR file") return True else: print("[-] No update found.") return False if __name__ == "__main__": # Simulating a malicious update file served by a compromised server malicious_mar = "malicious_update_v1.19.8.mar" # Create a dummy file to simulate existence with open(malicious_mar, 'wb') as f: f.write(b'MALICIOUS_PAYLOAD_CONTENT') print(f"--- Simulating Auto-Update Process for CVE-2026-41431 ---") result = vulnerable_updater_check(malicious_mar) if result: print("[SUCCESS] Arbitrary code executed via update mechanism.") # Cleanup os.remove(malicious_mar)