The operating system resolves those "dots" by moving up four levels, bypassing the documents , assets , html , and www folders until it hits the system root. From there, the attacker can try to read any file on the machine. Why Is This Relevant Today?
As a web developer or a curious internet user, you may have stumbled upon a peculiar URL pattern that looks like "-template-..-2F..-2F..-2F..-2Froot-2F". At first glance, this string appears to be a jumbled collection of characters, but it actually represents a specific type of URL encoding. In this article, we'll dive into the world of URL encoding, explore the structure of this mysterious pattern, and discuss its implications for web development and security. -template-..-2F..-2F..-2F..-2Froot-2F
// Safer Implementation Example $base_dir = '/var/www/html/templates/'; $real_path = realpath($base_dir . $_GET['template']); if ($real_path === false || strpos($real_path, $base_dir) !== 0) die("Access Denied: Invalid Path"); include($real_path); Use code with caution. 3. Implement Strict Input Validation The operating system resolves those "dots" by moving
When security scanners or malicious actors inject this string into a vulnerable application's template engine or file-handling parameter, they attempt to break out of the designated web directory and access sensitive server configuration files. Anatomy of the Payload As a web developer or a curious internet
A good WAF will automatically detect and block patterns like ..-2F or ../ in URL parameters. Conclusion
An attacker discovers that the application does not filter .. or URL encoding. They craft the following request:
The string you've provided is: -template-..-2F..-2F..-2F..-2Froot-2F