Insecure TLS_DH_anon_WITH_RC4_128_MD5

IANA name:

TLS_DH_anon_WITH_RC4_128_MD5

GnuTLS name:

TLS_DH_ANON_ARCFOUR_128_MD5

Hex code:

0x00, 0x18

TLS Version(s):

TLS1.0, TLS1.1, TLS1.2, TLS1.3

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Protocol:

Transport Layer Security (TLS)

Key Exchange:

Diffie-Hellman (DH)

Non-ephemeral Key Exchange:

This key exchange algorithm does not support Perfect Forward Secrecy (PFS) which is recommended, so attackers cannot decrypt the complete communication stream.

Raccoon Attack:

The so-called Raccoon Attack affects the specifications of TLS 1.2 and below when using a DH(E) key exchange. According to the researchers, while very hard to exploit, in rare circumstances this timing attack allows attackers to decrypt the connection between users and the server. A fix has been introduced in the TLS 1.3 specification.

Authentication:

Anonymous (anon)

Anonymous key exchange:

Anonymous key exchanges are generally vulnerable to Man in the Middle attacks.

Encryption:

Rivest Cipher 4 with 128bit key (RC4 128)

Rivest Cipher 4:

IETF has officially prohibited RC4 for use in TLS in RFC 7465. Therefore, it can be considered insecure.

Hash:

HMAC Message Digest 5 (MD5)

Message Digest 5:

The Message Digest 5 algorithm suffers form multiple vulnerabilities and is considered insecure.

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Included in RFC:

• RFC 5246

Machine-readable:

application/json