Request-url-http-3a-2f-2f169.254.169.254-2flatest-2fmeta Data-2fiam-2fsecurity Credentials-2f [upd] Guide

* 169.254. 169.254 is an IP address used by cloud service providers, such as AWS, Azure, and Google Cloud, to provide metadata abo... Security Compass Understanding AWS Instance Metadata Service: A Closer Look 21 Jan 2024 —

The exact keyword query string represents an encoded or raw attempt to access AWS IMDSv1 to retrieve temporary security credentials. Let's break down exactly what each component of that path means:

The encoded form of the URL appears in many attack payloads, log entries, and exploit scanners. Security researchers often look for this string in web application logs to detect attempted SSRF (Server-Side Request Forgery) attacks. Let's break down exactly what each component of

Configure your WAF to actively scan incoming query strings, headers, and POST bodies for regex patterns matching 169.254.169.254 or its encoded representations ( 3A-2F-2F ). Flagging and dropping these requests at the edge prevents the malicious payload from ever reaching your web application code.

http://169.254.169.254/latest/meta-data/iam/security-credentials/ Flagging and dropping these requests at the edge

The primary risk associated with this URL is .

Ensure that the IAM roles attached to your EC2 instances have the absolute minimum permissions required to perform their tasks. Even if an attacker steals the credentials, their impact is limited if the role cannot access sensitive data or modify infrastructure. Use Network Firewalls and Security Groups such as AWS

When an attacker successfully crafts a request to this URL through a vulnerable web application, they are attempting to trick the server into fetching its own internal metadata and displaying it to the user. Why This is Critical

If using Docker, prevent containerized applications from accessing the host's metadata endpoint. Summary Table: IMDSv1 vs. IMDSv2 IMDSv2 (Recommended) Request Method PUT (Session) + GET Authentication Token-based SSRF Resistant Header Protection Vulnerable Protects against X-Forwarded-For

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