CentOS6.5升級OpenSSH 8.3版本

OpenSSH 存在輸入驗證錯誤漏洞(CVE-2019-16905)，需要對版本進行升級到8.3。

1、下載openssh8.3升級包及依賴的zlib和openssl。

openssh-8.3p1.tar.gz、zlib-1.2.11.tar.gz、openssl-1.1.1g.tar.gz

https://files-cdn.cnblogs.com/files/luckjinyan/zlib-1.2.11.tar.gz

https://files-cdn.cnblogs.com/files/luckjinyan/openssh-8.3p1.tar.gz

https://files-cdn.cnblogs.com/files/luckjinyan/openssl-1.1.1g.tar.gz

2、解壓升級包

tar --no-same-owner -zxvf zlib-1.2.11.tar.gz
tar --no-same-owner -zxvf openssh-8.3p1.tar.gz
tar --no-same-owner -zxvf openssl-1.1.1g.tar.gz

3、編譯安裝zlib

cd zlib-1.2.11
./configure --prefix=/usr/local/zlib
make && make install

4、編譯安裝openssl

cd openssl-1.1.1g
./config --prefix=/usr/local/ssl -d shared
make && make install
echo '/usr/local/ssl/lib' >> /etc/ld.so.conf
ldconfig -v 

5、安裝openssh

cd openssh-8.3p1
./configure --prefix=/usr/local/openssh --with-zlib=/usr/local/zlib --with-ssl-dir=/usr/local/ssl
make && make install

6、sshd_config文件修改

echo 'PermitRootLogin yes' >>/usr/local/openssh/etc/sshd_config
echo 'PubkeyAuthentication yes' >>/usr/local/openssh/etc/sshd_config
echo 'PasswordAuthentication yes' >>/usr/local/openssh/etc/sshd_config

7、備份原有文件，並將新的配置複製到指定目錄

mv /etc/ssh/sshd_config /etc/ssh/sshd_config.bak
cp /usr/local/openssh/etc/sshd_config /etc/ssh/sshd_config

mv /usr/sbin/sshd /usr/sbin/sshd.bak
cp /usr/local/openssh/sbin/sshd /usr/sbin/sshd

mv /usr/bin/ssh /usr/bin/ssh.bak
cp /usr/local/openssh/bin/ssh /usr/bin/ssh

mv /usr/bin/ssh-keygen /usr/bin/ssh-keygen.bak
cp /usr/local/openssh/bin/ssh-keygen /usr/bin/ssh-keygen

mv /etc/ssh/ssh_host_ecdsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub.bak
cp /usr/local/openssh/etc/ssh_host_ecdsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub

8、啓動sshd

service sshd restart

9、查看信息版本

ssh -V