-template-..-2f..-2f..-2f..-2froot-2f

The string you've provided is: -template-..-2F..-2F..-2F..-2Froot-2F

When an application improperly handles user input within file paths, it concatenates this input directly into a file-system call. This allows an attacker to read sensitive data, such as configuration files, source code, or system credentials. Technical Mechanics of Path Traversal

To understand how a server interprets this, we must break down its individual components:

The presence of -2F in a log signature indicates that an attacker is mapping the application's unique decoding behavior to slip past signature-based detection systems. Business and Technical Impact

Accessing root-level SSH keys allows attackers to bypass web application boundaries entirely and log directly into the server infrastructure. Remediation and Prevention Strategies -template-..-2F..-2F..-2F..-2Froot-2F

The attacker changes the URL to: https://example.com

Block requests containing sequences like:

Because the operating system does not interpret -2F as a slash, the attack would unless the application explicitly decodes that custom encoding. However, suppose the CMS has a legacy normalization routine that replaces every -2F with / before including the file. Then the effective path becomes: /var/cms/templates/-template-../../../../root/.bashrc

The string ..-2F..-2F..-2F..-2Froot-2F is URL-encoded, but with a slight variation often seen in bypass attempts. The string you've provided is: -template-

If users need to select files, do not let them pass the filenames or paths directly. Use an alphanumeric ID or a lookup table. Instead of ?file=../../etc/passwd , use ?file_id=5 .

In URL encoding, %2F represents the forward slash ( / ). The given string replaces % with a hyphen ( - ), yielding -2F . This is a known obfuscation technique to bypass naïve filters that look for %2F or ../ but not hyphens.

If the application simply deletes ../ from the input string, an attacker can nest the sequence: : ....// or ..././

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). Business and Technical Impact Accessing root-level SSH keys

// Safer example function safeResolvePath(root, relativePath) return path.resolve(root, relativePath);

Even if the traversal is successful, the payload targets /root/ .

The .. is the traversal sequence.

Directory traversal is often a gateway to more severe attacks. If an attacker can read arbitrary files, they might retrieve source code, discover database passwords, or read SSH private keys. Even more critical, if the application allows file inclusion (e.g., include() in PHP), an attacker may achieve remote code execution by including server logs, session files, or uploaded malicious files. For example, after using -template-../../../../root/var/log/apache2/access.log , an attacker could poison the log with PHP code and then include that log file.

An application has a download feature: