SSL/TLS Services Support RC4 (PCI DSS)
Medium Nessus Plugin ID 106458
SynopsisA service on the remote host supports RC4
DescriptionAt least one of the SSL or TLS services on the remote host supports the use of RC4 for encryption.
RC4 does not meet the PCI definition of strong cryptography as defined by NIST Special Publication 800-57 Part 1.
The RC4 cipher is flawed in its generation of a pseudo-random stream of bytes so that a wide variety of small biases are introduced into the stream, decreasing its randomness. If plaintext is repeatedly encrypted (e.g., HTTP cookies), and an attacker is able to obtain many (i.e., tens of millions) ciphertexts, the attacker may be able to derive the plaintext.
SolutionConsult the software's manual and reconfigure the service to disable support for RC4.