CVE-2025-52712

Executive Summary

CVE-2025-52712 is a Path Traversal vulnerability in the WordPress plugin Post and Page Builder by BoldGrid (slug: post-and-page-builder). The vulnerability allows an unauthenticated attacker to traverse directories using the .../...// pattern, potentially reading arbitrary files on the server. The CVSS score is 4.2 (Medium), and the EPSS score is 0.0%, indicating low exploitation likelihood at this time. No public proof-of-concept or patch details are available.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users should monitor for updates from the vendor (BoldGrid) and apply patches as soon as they become available. The plugin is not distributed via NPM, PyPI, Go, or Ruby.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – The vulnerable component remains the same.
• Confidentiality (C): Low (L) – Limited file read capability.
• Integrity (I): None (N) – No data modification.
• Availability (A): None (N) – No denial of service.

Threat Level: Medium. The vulnerability allows limited file disclosure but does not lead to remote code execution or data modification.

Deep Dive & Mechanics

The vulnerability resides in the BoldGrid Post and Page Builder plugin for WordPress. The plugin fails to properly sanitize user-supplied input when handling file paths, specifically in functions that read or include files based on user parameters. The .../...// pattern is a known bypass technique for path traversal filters that strip or block ../ sequences. By using triple dots and double slashes, the attacker can bypass simple sanitization and traverse up directories.

The vulnerable code likely appears in a file that processes AJAX requests or template includes. For example, a function like boldgrid_get_template() might accept a file parameter and pass it directly to file_get_contents() or include() without proper validation.

Vulnerable vs. Patched Code

Vulnerable Code (hypothetical):

function boldgrid_load_template($file) {
    $path = WP_CONTENT_DIR . '/plugins/post-and-page-builder/templates/' . $file;
    if (file_exists($path)) {
        include($path);
    }
}

Patched Code (hypothetical):

function boldgrid_load_template($file) {
    $allowed_path = realpath(WP_CONTENT_DIR . '/plugins/post-and-page-builder/templates/');
    $path = realpath($allowed_path . '/' . basename($file));
    if ($path && strpos($path, $allowed_path) === 0 && file_exists($path)) {
        include($path);
    }
}

The patched version uses realpath() to resolve the canonical path and then checks that it starts with the allowed base directory, preventing directory traversal.

Exploitation & Lab Setup

Red Team

1. Setup: Install WordPress with BoldGrid Post and Page Builder plugin version 1.27.8.
2. Exploit: Send a crafted HTTP request to the vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=boldgrid_load_template&file=.../...//.../...//wp-config.php).
3. Payload: .../...//.../...//wp-config.php to read the WordPress configuration file.

Example curl command:

curl -X GET "http://target/wp-admin/admin-ajax.php?action=boldgrid_load_template&file=.../...//.../...//wp-config.php"

Blue Team

1. Detection: Monitor for requests containing .../...// or similar traversal patterns in HTTP parameters.
2. Mitigation: Implement a Web Application Firewall (WAF) rule to block path traversal attempts.
3. Harden: Ensure the plugin is updated to the latest version as soon as a patch is released.

Indicators of Compromise (IOCs)

• HTTP Request Patterns: .../...// in GET/POST parameters.
• File Access Logs: Unusual access to files outside the plugin's template directory (e.g., /etc/passwd, wp-config.php).
• Error Logs: PHP warnings about file_get_contents() or include() failing due to path resolution.

Detection Engineering

YARA Rule

rule CVE_2025_52712_Path_Traversal {
    meta:
        description = "Detects path traversal attempts using .../...// pattern"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-52712"
    strings:
        $traversal = ".../...//"
    condition:
        $traversal
}

Sigma Rule

title: CVE-2025-52712 Path Traversal Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests with .../...// pattern indicating path traversal
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-2025-52712 Path Traversal Attempt"; flow:to_server; content:".../...//"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the BoldGrid Post and Page Builder plugin until a patch is available.
2. Short-term: Implement a WAF rule to block requests containing .../...// in any parameter.
3. Long-term: Update the plugin to a patched version once released by BoldGrid.
4. Compensating Controls: Restrict file permissions on the server to limit the impact of file disclosure.

Valters IT
Securing Digital Frontiers