Callback-url-http-3a-2f-2f169.254.169.254-2flatest-2fmeta Data-2fiam-2fsecurity Credentials-2f __link__

Block direct access to 169.254.169.254 from non-essential application code using internal firewalls or security groups. 3. Implement Least Privilege

: Applications running on EC2 instances should handle these temporary credentials securely, avoiding any form of insecure storage or transmission.

: The IAM role determines what AWS resources the instance can access. By fetching credentials for the role attached to the instance, applications running on the instance can make secure, authorized requests to AWS services.

The IP address 169.254.169.254 is a used specifically by AWS to provide instance metadata to the machine itself. It is not accessible from the public internet. The Attack Vector: SSRF Block direct access to 169

The application then uses the URL http://169.254.169.254/latest/meta-data/iam/security-credentials/ to retrieve temporary security credentials (AccessKey, SecretKey, and Token) associated with that role. How to Access Security Credentials

If you are writing a post to help others secure their infrastructure against this, consider these key sections: 1. The "Red Flag" Parameters

Ensure that the IAM roles attached to your instances have the absolute minimum permissions required to function. : The IAM role determines what AWS resources

In the ecosystem of Amazon Web Services (AWS), automation and security are paramount. One of the most critical mechanisms that binds these two concepts together is the Instance Metadata Service (IMDS). The URL http://169.254.169.254/latest/meta-data/iam/security-credentials/ is the specific pathway through which applications running on an EC2 instance retrieve the temporary security credentials required to interact with other AWS services.

If you want, I can:

SSRF is a vulnerability that allows an attacker to force a server to make requests to locations it did not intend to. If a web application running on an EC2 instance is vulnerable to SSRF, an attacker can trick the server into sending a request to its own metadata service. It is not accessible from the public internet

The 169.254.169.254/latest/meta-data/iam/security-credentials/ endpoint is a powerful convenience that, if managed properly, enables secure, keyless architecture. By understanding how to access this data and actively defending against SSRF through IMDSv2, you ensure your AWS infrastructure remains secure.

: The attacker uses the discovered role name to execute a subsequent request, stealing the active AWS session keys. They can then use these keys locally on their machine via the AWS CLI to interact directly with your cloud environment. The Crucial Difference: IMDSv1 vs. IMDSv2