-template-..-2f..-2f..-2f..-2froot-2f.aws-2fcredentials -

The operating system resolves the relative path, steps completely out of /var/www/html/templates/ , and prints the contents of the AWS credentials file directly to the attacker’s web browser. Remediation and Mitigation Strategies

Another case involved a misconfigured Node.js application that used express.static() with a base directory that didn’t sanitize .. sequences. Attackers used GET /static/..%2F..%2F..%2Froot%2F.aws%2Fcredentials to retrieve the keys. The encoded %2F was enough to bypass a simple blacklist of ../ . -template-..-2F..-2F..-2F..-2Froot-2F.aws-2Fcredentials

: This is the standard location for AWS CLI credentials for the root user on Linux systems . How the Attack Works The operating system resolves the relative path, steps

To understand how this attack works, we have to break down the encoded components: steps completely out of /var/www/html/templates/

A highly sensitive private key used to sign programmatic requests.