PHP’s file_get_contents() or include() with unsanitized user input is a common source. Example vulnerable code:
// VULNERABLE CODE $file = $_GET['page']; include("/var/www/html/templates/" . $file); Use code with caution.
Remember:
If your application needs to serve files, map user inputs to a strict whitelist of allowed filenames rather than accepting raw paths.
That’s why credentials is a crown jewel for attackers. -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials
This payload targets a web application that takes file paths as input without proper sanitization. By using URL-encoded directory traversal sequences ( ..%2F or ..-2F ), an attacker escapes the intended web root directory to access the broader system. : ~/.aws/credentials
The specific pattern -file-..-2F..-2F... is not random; it is an attempt to bypass naive or pattern matching rules. Many security mechanisms look for literal ../ or %2e%2e%2f . By inserting a custom dash prefix ( -file- ) and using a non-standard encoding ( -2F ), the attacker hopes that: Remember: If your application needs to serve files,
@app.route('/download') def download(): filename = request.args.get('file') # Dangerous! No validation with open('/var/www/uploads/' + filename, 'r') as f: return f.read()
—stored in a simple file on their computer. These keys were powerful; they could start massive servers, access deep databases, and, unfortunately, run up a very large bill. By using URL-encoded directory traversal sequences (
: Require Session Tokens for metadata access, which stops most SSRF and LFI-based credential theft.