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

This string is a URL-encoded exploit payload used to test for Server-Side Request Forgery (SSRF) vulnerabilities, specifically targeting AWS Instance Metadata "good review"

If successful, an attacker can use these credentials to impersonate your server and access other AWS services, such as: S3 Buckets : Downloading sensitive customer data. EC2 Instances : Modifying or terminating infrastructure. Secrets Manager : Extracting database or API keys.

CB-20240424-001 Severity: Critical Vector: Server-Side Request Forgery (SSRF) / Configuration Leak This string is a URL-encoded exploit payload used

The URL you provided is a common payload used in Server-Side Request Forgery (SSRF)

In AWS, IAM roles are used to manage access to resources. When an instance is launched, it can be assigned an IAM role, which defines the permissions and access rights for that instance. The security credentials endpoint returns a JSON object containing the temporary security credentials for the instance's IAM role. These credentials can be used by the instance to access AWS resources. These credentials can be used by the instance

First, let’s decode the URL-encoded string:

Access AWS resources (S3 buckets, databases, etc.) permitted by that role. Potentially escalate privileges within the AWS environment. 4. Remediation and Prevention This string is a URL-encoded exploit payload used

AWS introduced IMDSv2, which requires a session-oriented PUT request to obtain a token before accessing metadata. This prevents most SSRF attacks because simple GET requests are ignored.