!new!: -file-..-2f..-2f..-2f..-2fhome-2f-2a-2f.aws-2fcredentials

Avoid storing permanent, plain-text AWS credentials on servers. If your application runs on AWS EC2, use . If it runs on Kubernetes, use IRSA (IAM Roles for Service Accounts) . These systems use temporary, automatically rotating tokens instead of static credentials files. 4. Deploy a Robust WAF

Use AWS Identity and Access Management (IAM) Roles instead of hardcoded access keys.

Ensure your web application validates all user input and that your server processes have the "least privilege" necessary, so they cannot read files in the directory.

The attacker identifies a file download or file display feature, such as: -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials

If successful, this attack results in a . An attacker who obtains these credentials can:

If you are worried about your AWS security, you can use the AWS Trusted Advisor to check for insecure configurations and open security groups. If you're interested, I can also:

Securing an application against directory traversal requires a defense-in-depth approach. 1. Implement Strict Input Allowlists Ensure your web application validates all user input

In a vulnerable file-reading endpoint, an attacker would supply this as the file parameter, expecting the application to retrieve and return the contents of ~/.aws/credentials for any user whose home directory matches the wildcard. In practice, the asterisk might be replaced with a known username ( ubuntu , ec2-user , root , etc.) or left as-is if the server performs globbing.

: A web application accepts user input to display files (e.g., https://example.com ).

If no validation is done, requesting: index.php?file=../../../../home/user/.aws/credentials will include the credentials file. use an indexed allowlist.

Assign an IAM Role directly to your EC2 instances or ECS/EKS tasks. The AWS SDK will automatically fetch temporary, rotating credentials from the Instance Metadata Service (IMDS), ensuring no static secrets exist on the disk to be stolen. 3. Enforce the Principle of Least Privilege

Never allow arbitrary file paths to be passed directly to file-system APIs. If users must select files, use an indexed allowlist.