The tool reads the updated credentials file and uses it for AWS API calls.
This is a targeting the default location of AWS credentials on Linux/macOS systems. The wildcard ( * ) suggests the attacker is hoping to access any user’s home directory.
After user approves login, the authorization server would normally redirect to http://localhost:PORT/callback . Instead, it redirects to: file:///home/<user>/.aws/credentials callback-url-file-3A-2F-2F-2Fhome-2F-2A-2F.aws-2Fcredentials
If the underlying application backend uses a naive HTTP fetching library (like certain outdated configurations of cURL , Python’s requests , or Node.js backend utilities) that natively evaluates the file:// scheme, it will open the file locally. If the server then processes the contents of that file and reflects them in the response body or an error log visible to the user, the credentials are instantly exposed. The Ultimate Prize: The .aws/credentials File
Here’s a detailed feature breakdown of what such a callback URL implies and how it would work. The tool reads the updated credentials file and
: This decodes to home/*/ , utilizing a wildcard character ( * ) to systematically scan or guess the active username directory on a Linux operating system.
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The final part of the URL, credentials , points to a specific file within the .aws directory. The credentials file is a text file that stores AWS access keys and other authentication details. This file is used by AWS CLI and SDKs to authenticate requests.
This path suggests a file located in a user's home directory, under a hidden directory named .aws , and specifically refers to a file named credentials . After user approves login, the authorization server would