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由于外网服务器扫描出SSH高危漏洞，需要升级SSH版本。
一、新版本SSH下载：https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/ 解压、编译配置(注意正确配置openssl路径)、编译、安装：
tar -zxvf openssh-10.0p1.tar.gzcd openssh-10.0p1./configure --prefix=/usr/local/openssh --with-ssl-dir=/usr/local/openssl341 --sysconfdir=/etc/ssh --with-pam --with-gssapi --with-rsa --with-rhosts-allowed --with-zlib --with-md5-passwordsmake && make install在configure openssh时，有参数 --with-pam，会提示：
PAM is enabled. You may need to install a PAM control file for sshd, otherwise password authentication may fail. Example PAM control files can be found in the contrib/subdirectory
就是如果启用PAM，需要有一个控制文件，按照提示的路径找到redhat/sshd.pam，并复制到/etc/pam.d/sshd，在/etc/ssh/sshd_config中设置UsePAM yes。
/etc/pam.d/sshd中内容如下：
# 文件内容如下
#%PAM-1.0
auth required pam_sepermit.so
auth substack password-auth
auth include postlogin
# Used with polkit to reauthorize users in remote sessions
-auth optional pam_reauthorize.so prepare
account required pam_nologin.so
account include password-auth
password include password-auth
# pam_selinux.so close should be the first session rule
session required pam_selinux.so close
session required pam_loginuid.so
# pam_selinux.so open should only be followed by sessions to be executed in the user context
session required pam_selinux.so open env_params
session required pam_namespace.so
session optional pam_keyinit.so force revoke
session include password-auth
session include postlogin
# Used with polkit to reauthorize users in remote sessions
-session optional pam_reauthorize.so prepare/etc/ssh/sshd_config 中设置UsePAM yes
二、替换原openssh
1、备份替换相关文件
mv /usr/sbin/sshd /usr/sbin/sshd_bak
mv /usr/bin/ssh /usr/bin/ssh_bak
mv /usr/bin/ssh-keygen /usr/bin/ssh-keygen_bak2、建立软连接
ln -s /usr/local/openssh/sbin/sshd /usr/sbin/sshd //建立软连接
ln -s /usr/local/openssh/bin/ssh /usr/bin/ssh //建立软连接
ln -s /usr/local/openssh/bin/ssh-keygen /usr/bin/ssh-keygen //建立软连接或复制文件
cp -rf /usr/local/openssh/sbin/sshd /usr/sbin/sshd
cp -rf /usr/local/openssh/bin/ssh /usr/bin/ssh
cp -rf /usr/local/openssh/bin/ssh-keygen /usr/bin/ssh-keygen三、修改配置：
解决root不能远程SSH登录问题(如果不需要root帐户登陆不用配置)
1、注释/etc/pam.d/password-auth或/etc/pam.d/password-auth-ac中
#auth requisite pam_succeed_if.so uid >= 1000 quiet_success
2、设置/etc/ssh/sshd_config 中PermitRootLogin yes
四、重启ssh服务：
systemctl restart sshd
如果重启报错Permissions 0640 for’/etc/ssh/*****.key’ are too open.
为文件的权限设置过于宽松执行
chmod -R 600 /etc/ssh限制权限后再重启ssh服务解决
查询服务状态:
systemctl status sshd.service
正常运行，升级成功！！！
备注帐户解锁:
sudo passwd -u root
参考资料：
解决Linux系统Root不能远程SSH登录_linux ssh无法远程登录-CSDN博客
解决 OpenSSH开启 PAM后 root用户无法远程登录问题_failed password for root from-CSDN博客
解决openssh，openssl升级出现的坑_pam is enabled. you may need to install a pam cont-CSDN博客
启用UsePAM后用户登录失败_pam is enabled. you may need to install a pam cont-CSDN博客
openssl升级后开启UsePAM登录失败 - 焦国峰的随笔日记 - 博客园
linux环境openssl、openssh升级_openssl升级-CSDN博客
[SSH] Permissions 0644 for ‘.ssh/id_rsa‘ are too open._permissions 0644 for are too open-CSDN博客
key are too open_百度知道
磐维数据库openSSH 8.0到openSSH 9.3 - 墨天轮
docker启动sshd报错Could not load host key: /etc/ssh/ssh_host_rsa_key和Permissions 0640 for ‘/etc/ssh/ssh__docker could not load host key-CSDN博客
Linux系统下SSH服务启动失败故障处理_unit sshd.service entered failed state-CSDN博客