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

The string you provided is a URL-encoded representation of a specific HTTP request path. When decoded, it translates to:

The Path (/latest/meta-data/iam/security-credentials/):

This specific path returns the name of the IAM role assigned to the instance. A follow-up request to .../security-credentials/[role-name] would return the AccessKeyId , SecretAccessKey , and Token . The string you provided is a URL-encoded representation

In the world of cloud computing, metadata and security credentials play a crucial role in ensuring secure communication between services. Recently, a peculiar callback URL caught our attention: http://169.254.169.254/latest/meta-data/iam/security-credentials/ . In this feature, we'll embark on a journey to understand the significance of this URL and what it reveals about the inner workings of cloud infrastructure. Instance Startup : Upon startup, an AWS instance

Incident ID:

CB-20240424-001 Severity: Critical Vector: Server-Side Request Forgery (SSRF) / Configuration Leak Instance Startup : Upon startup

1. Instance Startup: Upon startup, an AWS instance is configured with an IAM role.
2. Metadata Request: The instance requests its IAM security credentials from the metadata service.
3. Credential Response: The metadata service responds with temporary security credentials (Access Key ID and Secret Access Key) associated with the IAM role.
4. Secure Access: The instance then uses these credentials to securely access AWS resources without needing to hard-code or store sensitive credentials locally.