-template-..-2f..-2f..-2f..-2froot-2f - [top]

$template = $_GET['template']; include("/var/www/templates/" . $template . ".php"); If the developer decodes -2F to / but doesn’t sanitize .. , the request: ?template=-template-..-2F..-2F..-2F..-2Froot-2Fsecret.txt → becomes: /var/www/templates/-template-../../../../root/secret.txt

Below is a detailed technical article analyzing this pattern, its decoding, potential exploitation, and mitigation strategies. Introduction: When a URL Tells a Story Web application security is often an exercise in pattern recognition. Buried within server logs, intrusion detection alerts, or custom API calls, strings like -template-..-2F..-2F..-2F..-2Froot-2F may appear at first glance to be random encoding debris. However, decoding such patterns reveals a deliberate attempt at directory traversal, targeting a system’s root directory ( /root/ on Unix-like systems). -template-..-2F..-2F..-2F..-2Froot-2F

| Context | Example Scenario | |---------|------------------| | | https://example.com/view?file=-template-..-2F..-2F..-2F..-2Froot-2Fpasswd | | HTTP POST/GET parameters | Template engine parameter accepting a relative include path | | Server access logs | As a requested resource with path traversal | | File upload filenames | Malicious filename attempting to break out of upload directory | | Cookie values | Encoded payload in a session variable used to load templates | $template = $_GET['template']; include("/var/www/templates/"

This string contains URL-encoded path traversal patterns ( ..%2F decoded is ../ ), suggesting a security or server misconfiguration context (e.g., Local File Inclusion, Directory Traversal attacks, or web template engine quirks). , the request:

grep -E '\.\.\/\.\.\/\.\.\/\.\.\/root\/' access.log

grep -E '\-template\-\.\.\-2F\.\.\-2F\.\.\-2F\.\.\-2Froot\-2F' access.log