Curl-url-http-3a-2f-2f169.254.169.254-2flatest-2fapi-2ftoken -

TOKEN=$(curl -X PUT "http://169.254.169" \ -H "X-aws-ec2-metadata-token-ttl-seconds: 21600") Use code with caution.

Understanding the AWS IMDSv2 Token Fetch Command: curl 169.254.169

When you see the string curl-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fapi-2Ftoken (which is a URL-encoded version of the path), it refers to this specific two-step process. Step 1: Generate the Token curl-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fapi-2Ftoken

: Even if an attacker can execute a GET request through your app, they cannot easily perform the PUT handshake required to get a token. Conclusion

Once you have the $TOKEN , you can access the metadata safely: TOKEN=$(curl -X PUT "http://169

By requiring a session token, AWS adds a layer of defense against: : Preventing accidental exposure.

: You include that token in the header of all subsequent metadata requests. Breaking Down the Command Conclusion Once you have the $TOKEN , you

: Defines how long the token is valid (in this case, 21,600 seconds or 6 hours). Step 2: Access Metadata

: Standard WAFs are better at blocking complex PUT requests than simple GET requests.

curl -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169 Use code with caution. Why This Matters for Security