我负责的其中一台服务器未通过 PCI 合规性 ASV 扫描。
收到的警告是：
The SSH server running on the remote host is affected by an information disclosure vulnerability.
According to its banner, the version of OpenSSH running on the remote host is prior to 7.5. It is, therefore, affected by an information disclosure vulnerability :
- An unspecified timing flaw exists in the CBC padding oracle countermeasures, within the ssh and sshd functions, that allows an unauthenticated, remote attacker to disclose potentially sensitive information.
Note that the OpenSSH client disables CBC ciphers by default. However, sshd offers them as lowest-preference options, which will be removed by default in a future release. (VulnDB 144000)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Open SSH 7.4 是稳定的 Debian 软件包中的当前版本。
我知道 Debian 经常会反向移植安全修复程序，但是为了获得“误报”的批准，我必须向扫描公司提供一些证据。
有人可以建议在哪里/如何确认这一点吗？
答案1
文中直接警告您，所做的只是检查报告的版本。
您可以从服务器配置中删除 CBC 密码，然后与他们共享该配置。网上有一些这方面的指南，请选择您认为值得信赖的指南。
为了稳定，我会继续使用 Debian 的版本。使用最新服务器和客户端的默认行为很可能是安全的，但维护人员将缓慢而谨慎地删除与旧密码的向后兼容性。