Knowledge Base

F

Authentication Method: anonymous authentication

Summary

Security

Lack of authentication is combined with anonymous key exchange[397][398], identity of server cannot be proved, so connection is open for a man-in-the-middle attack[61].

Suggestion

Remove the cipher suite from the list of cipher suites supported by your server.

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Config Snippets

You can fix your security setting with the following config snippets in various services. You simply copy-paste (or delete) them to get a better secirity and grade. Do not forget to re-check your modified settings above.

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Apache
OpenSSL version: 0.9.8+ 
SSLCipherSuite …:!aNULL
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NGINX
OpenSSL version: 0.9.8+ 
ssl_ciphers …:!aNULL

Affected Cipher Suites

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TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA TLS_DH_anon_EXPORT_WITH_RC4_40_MD5 TLS_DH_anon_WITH_3DES_EDE_CBC_SHA TLS_DH_anon_WITH_AES_128_CBC_SHA TLS_DH_anon_WITH_AES_128_CBC_SHA256 TLS_DH_anon_WITH_AES_128_GCM_SHA256 TLS_DH_anon_WITH_AES_256_CBC_SHA TLS_DH_anon_WITH_AES_256_CBC_SHA256 TLS_DH_anon_WITH_AES_256_GCM_SHA384 TLS_DH_anon_WITH_ARIA_128_CBC_SHA256 TLS_DH_anon_WITH_ARIA_128_GCM_SHA256 TLS_DH_anon_WITH_ARIA_256_CBC_SHA384 TLS_DH_anon_WITH_ARIA_256_GCM_SHA384 TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256 TLS_DH_anon_WITH_CAMELLIA_128_GCM_SHA256 TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256 TLS_DH_anon_WITH_CAMELLIA_256_GCM_SHA384 TLS_DH_anon_WITH_DES_CBC_SHA TLS_DH_anon_WITH_RC4_128_MD5 TLS_DH_anon_WITH_SEED_CBC_SHA TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA TLS_ECDH_anon_WITH_AES_128_CBC_SHA TLS_ECDH_anon_WITH_AES_256_CBC_SHA TLS_ECDH_anon_WITH_NULL_SHA TLS_ECDH_anon_WITH_RC4_128_SHA