: The target application parameter responsible for handling post-authentication redirect URIs .

/home/ : The typical directory for user profiles in Linux/Unix systems.

The string callback-url-file-3A-2F-2F-2Fhome-2F-2A-2F.aws-2Fcredentials is a signature of a security probe trying to read AWS credentials. Its presence indicates a need to review application input validation and ensure that sensitive credentials are not stored in easily accessible local files.

In OAuth 2.0 and OpenID Connect, the redirect_uri (or callback URL) is a critical security parameter. Many implementations strictly validate that the redirect URI uses HTTPS. However, some custom or legacy implementations may mistakenly allow the file:// scheme. If an attacker can set the redirect URI to file:///home/*/.aws/credentials , the authorization server might attempt to “redirect” by reading a local file and sending its content as the callback payload.

: The URI scheme designed to locate files locally on the hosting machine, rather than via http:// or https:// .

The /home/*/.aws/credentials file contains sensitive information, making it a high-value target for attackers. If an unauthorized party gains access to this file, they can use the credentials to access AWS services, potentially leading to security breaches.