Fetch-url-http-3a-2f-2f169.254.169.254-2flatest-2fmeta Data-2fiam-2fsecurity Credentials-2f !!install!! Guide

The address 169.254.0.0/16 is a link‑local range. It is , but it is accessible from within the same virtual network or host. EC2 instances are automatically configured to route this IP to the metadata service. For an attacker on the outside, the only way to reach it is by tricking the victim’s own server into making the request.

The danger arises when an application has a vulnerability called . The address 169

: Regularly monitor and audit the use of these credentials within your AWS environment. For an attacker on the outside, the only

This prevents unprivileged web application processes (e.g., www-data ) from reaching the metadata service, even if SSRF exists. This prevents unprivileged web application processes (e

The URL string is the internal API endpoint for the AWS Instance Metadata Service (IMDSv1), which allows applications on an EC2 instance to dynamically retrieve temporary IAM security credentials. While essential for seamless cloud authentication, this specific endpoint represents one of the most critical attack vectors in cloud security. If an application suffers from a Server-Side Request Forgery (SSRF) vulnerability, an external attacker can manipulate the server to fetch this URL, steal the temporary AWS keys, and potentially compromise the entire cloud infrastructure. What is the 169.254.169.254 Endpoint?

Countless security incidents have involved exposed IMDS endpoints, including the where a misconfigured WAF allowed SSRF to the metadata service, leaking hundreds of thousands of customer records.

# Step 1: Get a token (valid for up to 6 hours) TOKEN=$(curl -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600")