: The application uses these temporary security credentials to make requests to AWS services.
For enterprise environments, enforce this organization-wide using or AWS Config rules to deny the launch of any EC2 instance that allows IMDSv1. Implement Strict Input Validation
: Sending a request to this endpoint returns the name of the IAM (Identity and Access Management) role attached to the EC2 instance (e.g., web-application-production-role ). : The application uses these temporary security credentials
: If an instance is compromised, the temporary credentials could potentially be misused. However, the limited duration of these credentials mitigates this risk.
The URL http://169.254.169 is a sensitive AWS endpoint for retrieving temporary IAM security credentials for an EC2 instance, often targeted in Server-Side Request Forgery (SSRF) attacks. Attackers exploit this to gain credentials, which can be mitigated by enforcing IMDSv2, validating input, and adhering to least-privilege IAM policies. Read more on the AWS website about securing EC2 instance metadata. : If an instance is compromised, the temporary
This IP is only accessible from within the virtual machine (VM) or container itself. It cannot be routed over the public internet.
[ Attacker ] │ │ 1. Sends malicious input: ?url=http://169.254.169... ▼ [ Vulnerable Web App (EC2) ] │ │ 2. Server processes request locally ▼ [ AWS IMDS Endpoint (169.254.169.254) ] │ │ 3. Returns temporary IAM Access Keys ▼ [ Vulnerable Web App (EC2) ] │ │ 4. Reflects keys back in HTTP response ▼ [ Attacker (Now has AWS Keys) ] Attackers exploit this to gain credentials, which can
When an AWS EC2 instance is assigned an IAM role, AWS automatically provisions temporary security credentials for that role. The application running on the instance retrieves these credentials by querying the following path:
In the world of cloud computing, particularly on Amazon Web Services (AWS), a specific URL has gained significant attention among developers and security professionals alike. The request URL http://169.254.169.254/latest/meta-data/iam/security-credentials/ plays a crucial role in how AWS instances interact with the cloud provider to fetch temporary security credentials. This article aims to dissect the components of this URL, understand its purpose, and explore its implications on security and cloud infrastructure management.