: The attacker is trying to force the application to execute a request to file:///root/.aws/config .
The config file isn't just for regions. You can tune performance. For example, if you are uploading massive files to S3, you can increase the transfer concurrency specifically for S3 operations: fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig
To understand the target of the request, we must first decode the URL-encoded string: : The attacker is trying to force the
In php.ini , set:
The string fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig is a URL-encoded representation of a local file path. URL encoding (percent-encoding) replaces special characters with a % followed by two hexadecimal digits. However, here we see -3A-2F-2F-2F instead of %3A%2F%2F%2F . This is a variant where hyphens are used as delimiters – sometimes seen in logs or encoded payloads after double encoding or custom transformations. For example, if you are uploading massive files
Below is a draft for a technical blog post exploring how this payload works, what it targets, and how to defend against it.
Protecting your environment from this specific "fetch" exploit requires a multi-layered defense:
