Fixing SSL/TLS vulnerabilities on RHEL 6.4

OpenSSL 1.0.0 is the latest available version for RHEL 6.4
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,hmac-ripemd160

Restart the SSH daemon :

service sshd restart

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