Nessus扫描后，如下问题

SSH Weak Key Exchange Algorithms Enabled 和 SSH Server CBC Mode Ciphers Enabled

解决方法如下：

修改/etc/ssh/sshd_config文件，在文件尾增加如下内容

vim /etc/ssh/sshd_config

Ciphers chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com

KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1