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

: If an application allows a user to provide a URL (like a callback or webhook) and then fetches that URL from the server side without validation, an attacker can input the internal 169.254.169.254 address.

When an AWS instance makes a request to this URL, it is essentially asking for temporary security credentials that can be used to access AWS resources. These credentials are generated based on the IAM role associated with the instance. The process works as follows: : If an application allows a user to

If an attacker can cause a vulnerable application (e.g., a PHP, Node.js, or Java app that follows external URLs) to make a request to this decoded endpoint, the server will return the active IAM role's . : If an application allows a user to