From VMware vSphere ESXi 6.0 Security Technical Implementation Guide
Part of SRG-OS-000478-VMM-001980
Associated with: CCI-002450
Approved algorithms should impart some level of confidence in their implementation. These are also required for compliance.
Only FIPS-approved ciphers should be used. To verify that only FIPS-approved ciphers are in use, run the following command: # grep -i "^Ciphers" /etc/ssh/sshd_config If there is no output or the output is not exactly "Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,aes192-cbc,aes256-cbc", this is a finding.
Limit the ciphers to those algorithms which are FIPS-approved. Counter (CTR) mode is also preferred over cipher-block chaining (CBC) mode. Add or correct the following line in "/etc/ssh/sshd_config": Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,aes192-cbc,aes256-cbc
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