Request-url-http-3a-2f-2f169.254.169.254-2flatest-2fmeta Data-2fiam-2fsecurity Credentials-2f ((free)) < HIGH-QUALITY ✭ >

Implement strict validation on any user-supplied URLs.

When fully decoded, the string translates to: http://169.254.169 The Magic IP: 169.254.169.254

The endpoint /latest/meta-data/iam/security-credentials/ acts as a gateway to the machine's active identity.

The path http://169.254.169 specifically lists the IAM roles attached to the instance. If you append the role name to this URL, it returns temporary security credentials, including: AccessKeyId SecretAccessKey Token (Session Token) Implement strict validation on any user-supplied URLs

The attack vector described by this keyword explicitly targets . IMDSv1 relies on simple, unauthenticated HTTP GET requests, making it highly susceptible to SSRF.

If an EC2 instance has an associated IAM role, a GET request to this specific endpoint will return the for that role in a JSON format. The response typically contains:

The URL http://169.254.169.254/latest/meta-data/iam/security-credentials/ may appear to be a harmless, technical endpoint. However, it is one of the most powerful and dangerous URLs in the AWS ecosystem. When left exposed via IMDSv1, it acts as a "master key" that can grant an attacker full access to your cloud infrastructure with a single HTTP request. If you append the role name to this

Because standard SSRF vulnerabilities usually restrict attackers to simple GET requests and prevent them from injecting custom HTTP headers (like X-aws-ec2-metadata-token ), You should explicitly configure your EC2 launch templates and running instances to require IMDSv2 and disable IMDSv1 entirely. 2. Implement Input Validation and Whitelisting

Cure the underlying application flaw by validating all user-supplied URLs against a strict whitelist. Block any inputs containing: Literal IP addresses ( 169.254.169.254 , 127.0.0.1 ). Hexadecimal, octal, or URL-encoded variations of those IPs. DNS names that resolve to local loopback or private ranges. Apply the Principle of Least Privilege

You can no longer just "GET" the data. You must first perform a PUT request to generate a session token, then pass that token in an HTTP header to retrieve metadata. The response typically contains: The URL http://169

The string request-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fmeta data-2Fiam-2Fsecurity credentials-2F is a URL-encoded representation of a highly specific network request target: http://169.254.169 .

Remember: in cloud security, .