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Certified Ethical Hacker (CEH) Practice Question

During a web-application penetration test, you run nmap --script ssl-enum-ciphers -p 443 against the target host. The script shows a single supported cipher suite:

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (ecdh_x25519)

No other suites are offered. As the tester, which cryptographic weakness should you document, and what mitigation should you recommend?

  • It uses RSA for key exchange, so it lacks forward secrecy; recommend replacing it with DHE or ECDHE-based suites.

  • The x25519 elliptic curve is obsolete and insecure; mandate using the secp256r1 curve instead.

  • The suite relies on CBC with separate HMAC, making it susceptible to padding-oracle attacks such as BEAST and Lucky Thirteen; advise enabling AEAD cipher suites (AES-GCM or ChaCha20-Poly1305).

  • The 128-bit AES key length is now considered weak; require only 256-bit AES cipher suites.

Certified Ethical Hacker (CEH)
Cryptography
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