CVE-2026-39871 macOS路径处理问题致信息泄露

#!/usr/bin/env python3 """ Conceptual Proof of Concept (PoC) for CVE-2026-39871. This script simulates how a path handling issue might allow an app to access unprotected user data outside its sandbox. Note: This is a simulation based on the vulnerability description. """ import os def simulate_vulnerable_path_check(requested_path): """ Simulates a vulnerable path handling logic in macOS. In a vulnerable state, the system might fail to resolve canonical paths correctly, allowing access to restricted data. """ print(f"[*] App requesting access to: {requested_path}") # Simulate the vulnerable logic: insufficient canonicalization # Real vulnerability would be in the kernel/framework C code. base_path = "/var/mobile/Applications/MyApp/Data" # Vulnerable check: does not resolve '../' properly before checking prefix if requested_path.startswith(base_path) or "../" in requested_path: # In the real vulnerability, the OS might skip the strict check # due to logic flaw, allowing the traversal. resolved_path = os.path.normpath(requested_path) print(f"[!] VULNERABLE LOGIC: Access allowed to resolved path: {resolved_path}") # Simulate reading sensitive data if "PrivateUserData" in resolved_path: return "SENSITIVE_DATA_EXPOSED: User_Credentials.txt" else: print("[-] Access denied by sandbox.") return None # Attack Scenario: Crafting a path to escape sandbox # The app tries to access user data outside its container malicious_path = "/var/mobile/Applications/MyApp/Data/../../../Users/Shared/PrivateUserData" print("--- Testing CVE-2026-39871 PoC ---") result = simulate_vulnerable_path_check(malicious_path) if result: print(f"[+] EXPLOIT SUCCESSFUL: {result}") else: print("[-] Exploit failed.")