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July 15, 2024On July 1, 2024, researchers disclosed regreSSHion, tracked as CVE-2024-6387, an unauthenticated remote code execution flaw in OpenSSH on glibc-based Linux systems. OpenSSH is one of the most widely deployed services on the internet, which made this a high-priority patching event for anyone running Linux servers.
Why it drew so much attention
Remote, unauthenticated code execution against a service deliberately exposed for remote administration is close to a worst case. That said, the flaw was difficult to exploit reliably and required specific conditions, so the sky-is-falling framing was overstated. The correct response was still straightforward: patch promptly and shrink the attack surface.
A practical response checklist
- Update OpenSSH across servers, appliances, and container base images.
- Do not expose SSH to the whole internet. Put it behind a VPN, bastion host, or IP allow-list.
- Prefer key-based authentication and disable password logins.
Takeaway: The durable lesson is that administrative services should never sit open to the entire internet. Patch quickly, then ask why the service was reachable at all.