Fixing SSL/TLS vulnerabilities on RHEL 6.7

OpenSSL 1.0.1e is the latest available version for RHEL 6.7
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,rijndael-cbc@lysator.liu.se

MACs hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-sha1-96,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160@openssh.com

Restart the SSH daemon :

service sshd restart

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