The URL string request-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fmeta data-2Fiam-2Fsecurity credentials-2F is a URL-encoded log entry signature indicating a . Decoded, it represents a request to http://169.254.169 , a well-known endpoint used by attackers to compromise cloud environments.
When decoded, the raw path becomes: request-url-http://169.254.169 2. The Link-Local IP: 169.254.169.254
An application features a functional component that fetches external data—such as a profile picture upload via URL, a PDF generator, or a webhook tester. The URL string request-url-http-3A-2F-2F169
The requested URL is a critical endpoint within the used by EC2 instances to retrieve temporary security credentials. The presence of this specific string—often seen in logs or security alerts—frequently indicates an attempt to exploit a Server-Side Request Forgery (SSRF) vulnerability. What is this Endpoint?
If you append an IAM role name (e.g., MyAppRole ), the complete request becomes: The Link-Local IP: 169
These are . An attacker can use these credentials to authenticate as the server's IAM role from their own machine, potentially gaining full control over the AWS environment depending on the permissions assigned to that role. Technical Breakdown
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 What is this Endpoint
When you attach an IAM role to an EC2 instance, AWS automatically injects a set of temporary security credentials (access key, secret key, and session token) into the instance’s metadata. Any process or user on that instance can then retrieve those credentials by making a simple HTTP GET request to: