OS: CentOS 6.5 x86_64

1、开启 telnet 服务
yum install -y telnet-server telnet
/etc/xinet.d/telnet 中的yes 修改为no
service xinetd restart

2、下载相关文件

wget http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.3p1.tar.gz
wget https://www.openssl.org/source/openssl-1.0.2h.tar.gz
wget https://sourceforge.net/projects/libpng/files/zlib/1.2.8/zlib-1.2.8.tar.gz --no-check-certificate

3、编译安装

tar zxvf zlib-1.2.8.tar.gz
cd zlib-1.2.8
./configure
make && make install

tar zxvf openssl-1.0.2h.tar.gz
cd openssl-1.0.2h
./config --prefix=/usr/ --openssldir=/usr/shared
make
make test
make install

tar zxvf openssh-7.3p1.tar.gz
cd openssh-7.3p1
./configure --prefix=/usr/local #Will install OpenSSH in /opt/{bin,etc,lib,sbin}

--sysconfdir=/etc/ssh #will place the configuration files in /etc/ssh.

make
make install

4、修改启动文件并重启
vi /etc/init.d/sshd ，修改
SSHD=/usr/sbin/sshd 为 SSHD=/usr/local/sbin/sshd

/etc/init.d/sshd restart

5、telnet 127.0.0.1 22验证 根据回显看是否成功

6、mv /usr/bin/ssh   /usr/bin/ssh_bak
mv /usr/local/bin/ssh /usr/bin/ssh

7、关闭telnet

OPENSSH 升级到7.3p1