Fixing SSL/TLS vulnerabilities on CentOS 6.6

OpenSSL 1.0.1e is the latest available version for CentOS 6.6
By default, all ciphers and macs are enabled. To fix the SSL/TLS vulnerabilities, the weak ciphers and macs must be explicitly disabled as follows.
In the /etc/ssh/sshd_config, the following two lines must be added :


Ciphers aes128-ctr,aes192-ctr,aes256-ctr
MACs hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-sha2-256,hmac-sha2-512

Restart the SSH daemon :

service sshd restart

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