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ticho writes:

Earlier this summer, the team at Inversoft published a comprehensive and sophisticated guide to user data security. The guide spans from hardening servers from provisioning, up through the IP and SSH layers, and all the way to application-level techniques for password hashing, SQL injection protection, and intrusion detection. As proof that they stood behind their advice, the Inversoft team provisioned a pair of Linode hosts, a web server and database server, and gave them the hardening treatment. Inversoft offered up a fully-loaded MacBook to anyone who could break in, taunting all comers by naming the hardened web server hackthis.inversoft.com.

Game on.

Needless to say, they found a way in.

[...] After discovering an unpatched, unfirewalled Elasticsearch instance using nmap, we gained shell access on a utility server used for various functions at Inversoft. On there, we found API keys for Linode left behind by a human operator. Those keys allowed us to detach disks from running servers and attach them to servers we controlled, stealing sensitive user data (all to win a prize).

Original Submission