Callback-url-file-3a-2f-2f-2fhome-2f-2a-2f.aws-2fcredentials Access

If your software actually interprets callback-url-file:///home/*/.aws/credentials as a valid location to read files from, your system is critically vulnerable.

An attacker who can force your server to read ~/.aws/credentials can steal your Amazon Web Services (AWS) Access Keys. With those keys, the attacker can:

The * wildcard makes it worse – an attacker could potentially read credentials for any system user without knowing the exact username. callback-url-file-3A-2F-2F-2Fhome-2F-2A-2F.aws-2Fcredentials

Imagine you run a concierge service. You tell the concierge, "Anyone who brings a valid ticket can ask you to read any document."

An attacker hands you a ticket that says: "Read the file at /home/*/.aws/credentials." The * wildcard makes it worse – an

If your concierge does it, they just handed over the keys to your castle.

The file:// callback is that malicious ticket. Imagine you run a concierge service

Feature name:
Local File URI Callback for Credential Delivery

Callback URL format:
callback-url-file:///home/*/.aws/credentials

Purpose:
Securely deliver temporary AWS credentials (or other tokens) from a web auth flow directly into a local credentials file on disk, using a file-based callback instead of an HTTP local server.