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

solves this by requiring a session-oriented authentication process:

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

: 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 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.

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 When you see the string curl-url-http-3A-2F-2F169

The IP address is a link-local address used by AWS to provide the Instance Metadata Service (IMDS) . Every EC2 instance can query this address to retrieve information about itself—such as its instance ID, public IP, IAM role credentials, and security groups—without needing to call the AWS API externally. The Evolution: From IMDSv1 to IMDSv2

In the past (IMDSv1), metadata was accessible via a simple GET request. While convenient, this was vulnerable to attacks. If an attacker could trick a web application into making a request to that internal IP, they could steal sensitive IAM credentials. The Evolution: From IMDSv1 to IMDSv2 In the

Understanding the AWS IMDSv2 Token Fetch Command: curl 169.254.169