CVE-2026-33774 Junos OS防火墙过滤器绕过漏洞

# PoC for CVE-2026-33774: Firewall Filter Bypass Verification # This script demonstrates the configuration that triggers the vulnerability # and the verification method. def check_vulnerability(): # 1. Simulated Vulnerable Configuration # The filter is applied to lo0.1, but lo0.1 is not in a specific routing-instance. config = """ set interfaces lo0 unit 1 family inet filter input PROTECT-CP # Missing: routing-instances { ... interface lo0.1 } """ print("[+] Vulnerable Configuration Detected:") print(config) # 2. Verification Step # Check if the firewall counters are incrementing. # If traffic is sent to lo0.1 but counters remain 0, bypass is confirmed. print("[+] Verification Command:") print("show firewall counter filter PROTECT-CP") print("\n[!] Analysis:") print("If the output shows '0 packets' despite active traffic to lo0.1,") print("the firewall filter is being bypassed due to CVE-2026-33774.") if __name__ == "__main__": print("CVE-2026-33774 PoC - Junos MX Series Firewall Bypass") check_vulnerability()