file:///home/*/.aws/credentials
The string callback-url-file-3A-2F-2F-2Fhome-2F-2A-2F.aws-2Fcredentials decodes to a file path targeting sensitive AWS configuration: file:///home/*/.aws/credentials
Forensics checklist
: If successful, the attacker gains the same permissions as your server's AWS IAM role, which could lead to data breaches, resource deletion, or unauthorized infrastructure costs. 🛠️ Immediate Protection Steps
During OAuth 2.0 authentication flows , a user logs in through a third-party provider (like GitHub or Google). Once approved, the provider sends an authorization code back to a specified callback_url or redirect_uri managed by the application. callback-url-file-3A-2F-2F-2Fhome-2F-2A-2F.aws-2Fcredentials
: The URI scheme for accessing the server's local file system. /home/*/.aws/credentials
: This is the URL-encoded representation of :/// . file:///home/*/
: SSRF (Server-Side Request Forgery). The application does not properly validate or sanitize the protocol (e.g., allowing file:// instead of just http:// or https:// ). 3. Remediation Steps
By providing this string to a parameter that expects a URL (like a webhook or profile picture uploader), an attacker attempts to force the server to "fetch" its own local secret files and return the contents in the application response. : The URI scheme for accessing the server's
When fully compiled and decoded, the string reads: callback-url=file:///home/*/.aws/credentials The Exploitation Vector: From Callback to Cloud Compromise
[Attacker] ---> Sends OAuth Request with `file:///home/*/.aws/credentials` Callback ---> [Vulnerable App] | [Attacker] <--- Exfiltrates Plaintext AWS Secrets <--- App Reads Local File into Response <----+ 1. Arbitrary Callback Redirection