Force the server to use SHA-1 signatures. ssh -o KexAlgorithms=diffie-hellman-group14-sha1 -o HostKeyAlgorithms=ssh-rsa user@target (Spoiler: 7.9p1 still allows some weak algorithms by default. Cry about it.)
The real exploit is staring at the auth log. 7.9p1 logs everything. Wait for an admin to mistype their password. Or for a cron job to leak an argument. The Verdict: Patch or Panic? Do not panic. But do patch. openssh 7.9p1 exploit
Liked this? Check out my next post: "Is OpenSSL 1.0.2 really that bad? (Yes. Yes it is.)" Force the server to use SHA-1 signatures
for user in root admin ubuntu; do ssh -o PreferredAuthentications=none $user@target "2>&1" | grep "Permission denied (publickey)"; done The Verdict: Patch or Panic
Or, how I learned to stop worrying and love the changelog.
OpenSSH 7.9p1 is not a house of cards waiting for a single \x90\x90\x90 to collapse. It is a rusty lock on a wooden door. It won't break from a magic skeleton key, but it will shatter under a well-aimed shoulder barge.
There is a specific thrill in typing ssh -V on a legacy server and seeing it return: OpenSSH_7.9p1 . The heart skips a beat. The fingers itch to search for openssh 7.9p1 exploit on GitHub. You imagine a single command—a sleek, one-liner—that drops a root shell faster than you can say "CVE."