CVE-2026-27851 Open-Xchange安全过滤器绕过漏洞

# Conceptual PoC demonstrating the safe filter bypass vulnerability # This simulates how the 'safe' filter status propagates incorrectly def vulnerable_template_render(user_input): # Simulating variable expansion in the template engine expanded_string = f"search_filter=(uid={user_input})" # Pipeline Step 1: The 'safe' filter is applied # In the vulnerable version, this marks the entire object as 'safe' safe_marked_data = apply_safe_filter(expanded_string) # Pipeline Step 2: Subsequent filter intended for LDAP escaping # Due to the bug, this filter sees the 'safe' flag and skips escaping final_output = apply_ldap_escape_filter(safe_marked_data) return final_output def apply_safe_filter(data): # Buggy behavior: Marks data as safe, preventing future escaping data.is_safe = True return data def apply_ldap_escape_filter(data): # Check internal safety flag (simulated) if getattr(data, 'is_safe', False): # BUG: If marked safe, return raw data without escaping return str(data) # Normal behavior: Escape special characters return str(data).replace("(", "\\(").replace(")", "\\)") # Malicious payload to break LDAP syntax payload = "*))(|(password=*))" result = vulnerable_template_render(payload) print(f"Constructed LDAP Query: {result}") # Output will be unescaped, leading to authentication bypass or data exfiltration