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

Never allow arbitrary URLs in callback parameters. Implement a strict allowlist of approved domains and protocols (e.g., only

This string indicates an attempt to exploit an SSRF vulnerability . The IP address 169.254.169.254 is a link-local address used by AWS to provide instance metadata to EC2 instances. When an application is vulnerable to SSRF, an attacker can force the server to call this internal URL and return the temporary IAM credentials (AccessKeyId, SecretAccessKey, and SessionToken) assigned to that server. Never allow arbitrary URLs in callback parameters

Rather than hard-coding permanent access keys onto the server (which is a major security risk), AWS provides the IMDS. This is a service running on every EC2 instance accessible only from within the instance itself. It provides information about the instance, such as its ID, IP address, and crucially, the IAM role attached to it. When an application is vulnerable to SSRF, an

: Ensure the IAM role attached to the instance has only the minimum permissions necessary, so stolen credentials have limited impact. It provides information about the instance, such as

These credentials are that grant whatever permissions the IAM role has—potentially full administrative access to S3 buckets, Lambda functions, EC2 control, or even database snapshots.

AWS provides the Instance Metadata Service (IMDS) at the non-routable IP address 169.254.169.254 . This service allows applications running on an EC2 instance to retrieve information about the instance itself without needing an external API call.