Dec 17, 2025
Master Kali SSH hardening in 30 minutes: keys-first, root/password off, firewall allowlists, fail2ban, and sshd -T proof. What most miss—use this checklist.
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Master Kali SSH hardening in 30 minutes: keys-first, root/password off, firewall allowlists, fail2ban, and sshd -T proof. What most miss—use this checklist.
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LNK Exploit & OpenSSH-Over-Tor Backdoor Used in Covert Attack on Belarus Military
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ok btw just because i see people getting this wrong often.
If you install OpenSSH, the "scp" command NO LONGER uses the original Secure Copy Protocol. The original Secure Copy Protocol is outdated and insecure, and if you have a system that has it installed somehow, please get rid of it and/or don't use it.
According to Wikipedia, as of OpenSSH v9, the "scp" command uses SFTP, which is good and works and is secure.
The confusion is reasonable given that it's hard to tell someone that the "scp" command. doesn't use the scp protocol. And instead uses the protocol of another command instead. But yes, using "scp" or "sftp" both are okay because "scp" uses SFTP under the hood anyway.
sorry for the rant :3 I just saw something on reddit and had to correct x3
Convert PuTTY PPK SSH keys to OpenSSH format for seamless use on Ubuntu systems. This step-by-step guide ensures your existing SSH keys work perfectly across different operating systems.
If you're a linux[1] user who deploys multiple devices, I implore you: learn the command `scp`. It will change your life
It lets you copy files over an ssh pipe; if there's an ssh server on that host, you can essentially directly address a known file on that filesystem and say pwease gimme. And it's roughly the same syntax as `cp`, just with a `[user]@[host]:` before *either source or destination*[2].
And the real kicker is that neither source nor destination need be local:
I copied a file from my web server to an icecast source client host by passing it through my phone.
Unreasonably handy tool to have on your toolbelt.
Footnotes under the cut.
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SSH ProxyCommand example: Going through one host to reach another server
Explains going through one host to reach another using SSH ProxyCommand on a Linux or Unix with example about ssh to connect to other host
アメリカのセキュリティベンダーQualysは7月1日（現地時間）、「OpenSSH」サーバー（sshd）にシグナルハンドラーが競合状態に陥る脆弱性（CVE-2024-6387）が存在することを明らかにした。「glibc」ベースのLinuxシステムでリモートから悪用可能で、最悪の場合、ルート権限で認証なしに任意のコードが実行されてしまうおそれがある。
Regresshion
The vulnerability, which is a signal handler race condition in OpenSSH’s server (sshd), allows unauthenticated remote code execution (RCE) as root on glibc-based Linux systems; that presents a significant security risk. This race condition affects sshd in its default configuration.