SSRF occurs when an attacker forces a server-side application to make unauthorized requests. If an attacker leverages the file:// handler via cURL on a vulnerable server, they can map out the internal hosting environment, read internal metadata endpoints, and compromise the underlying infrastructure. How to Secure Your Applications
: A variation of percent-encoding where hyphens or specific system parsers represent the standard characters :// . The URL Encoding Translation
The output will be the name of the computer, read directly from the disk. curl-url-file-3A-2F-2F-2F
To mitigate this, developers should pass user-controlled input directly to a curl command.
Always wrap the URL in double quotes (e.g., curl "file:///path/to/file" ) to prevent the shell from interpreting characters like & or @ . SSRF occurs when an attacker forces a server-side
When combined, 3A-2F-2F-2F forms :/// , which sets up a local system path argument.
The string appears to be a URL-encoded or path-formatted representation of the command curl file:/// . The URL Encoding Translation The output will be
The format is an encoded representation of the file:/// protocol handler within cURL. It is a powerful tool for manipulating local files via command-line interface, allowing for consistent data handling across local and remote resources. However, it must be used with care to avoid security risks related to local file inclusion.