CVE-2024-3552: Web Directory Free SQLi Vulnerability

CVE-2024-3552 Overview

CVE-2024-3552 is a critical SQL Injection vulnerability affecting the Web Directory Free WordPress plugin before version 1.7.0. The plugin fails to properly sanitize and escape a parameter before incorporating it into a SQL statement. This vulnerability is exposed through an AJAX action that is accessible to unauthenticated users, making it particularly dangerous as no authentication is required to exploit it. Attackers can leverage multiple SQL injection techniques including UNION-based, Time-Based, and Error-Based injection methods.

Critical Impact

Unauthenticated attackers can exploit this SQL injection vulnerability to extract sensitive data from the WordPress database, including user credentials, plugin configurations, and potentially gain complete control over the affected website.

Affected Products

• Salephpscripts Web Directory Free versions prior to 1.7.0
• WordPress installations running vulnerable Web Directory Free plugin
• Any website utilizing the affected AJAX functionality

Discovery Timeline

• 2024-06-13 - CVE-2024-3552 published to NVD
• 2025-03-25 - Last updated in NVD database

Technical Details for CVE-2024-3552

Vulnerability Analysis

This SQL injection vulnerability exists in the Web Directory Free WordPress plugin due to improper input handling in an AJAX action handler. The plugin accepts user-supplied input and directly incorporates it into SQL queries without adequate sanitization or parameterized queries. This classic input validation failure allows attackers to manipulate the SQL query structure, potentially leading to unauthorized data access, data modification, or database compromise.

The vulnerability is particularly severe because it is accessible via WordPress AJAX endpoints without requiring any form of authentication. This means any external attacker can craft malicious requests targeting the vulnerable endpoint. The vulnerability supports multiple injection techniques, indicating the absence of any effective input filtering or output encoding mechanisms.

Root Cause

The root cause is an input validation failure (CWE-89: Improper Neutralization of Special Elements used in an SQL Command). The vulnerable code path accepts user input through an AJAX request parameter and passes it directly to a SQL query without proper sanitization, escaping, or the use of prepared statements. This architectural deficiency allows attackers to inject arbitrary SQL commands that are then executed by the database.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by:

1. Identifying the vulnerable AJAX endpoint exposed by the Web Directory Free plugin
2. Crafting a malicious HTTP request containing SQL injection payloads
3. Sending the request to the target WordPress installation
4. Extracting data using UNION-based techniques for direct data retrieval
5. Using Time-Based blind injection when direct output is not visible
6. Leveraging Error-Based injection to extract data through error messages

The vulnerability enables attackers to read sensitive database contents, potentially modify or delete data, and in some configurations, execute operating system commands or write files to the server.

Detection Methods for CVE-2024-3552

Indicators of Compromise

• Unusual SQL error messages in WordPress error logs or web server logs
• Unexpected AJAX requests to Web Directory Free plugin endpoints with SQL syntax in parameters
• Database query logs showing UNION SELECT statements or timing-based queries (SLEEP, BENCHMARK)
• Evidence of data exfiltration or unauthorized database access attempts

Detection Strategies

• Monitor web server access logs for suspicious requests containing SQL keywords (UNION, SELECT, SLEEP, BENCHMARK) targeting plugin AJAX endpoints
• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns
• Enable WordPress debug logging to capture unusual database query errors
• Deploy intrusion detection systems (IDS) with SQL injection signature detection capabilities

Monitoring Recommendations

• Configure real-time alerting for SQL injection patterns in web traffic
• Establish baseline metrics for AJAX request volumes and monitor for anomalies
• Review database query logs for unauthorized or unusual query patterns
• Implement application-level logging to track requests to the vulnerable plugin endpoints

How to Mitigate CVE-2024-3552

Immediate Actions Required

• Update the Web Directory Free plugin to version 1.7.0 or later immediately
• If immediate update is not possible, temporarily disable the Web Directory Free plugin
• Review WordPress database for signs of compromise or unauthorized access
• Audit web server and WordPress logs for evidence of exploitation attempts
• Change all database credentials and WordPress user passwords as a precautionary measure

Patch Information

The vulnerability has been addressed in Web Directory Free version 1.7.0. Administrators should update to this version or later through the WordPress plugin management interface or by manually downloading from the official plugin repository. After updating, verify the plugin version is correctly installed by checking the Plugins page in WordPress admin. Additional technical details about this vulnerability are available through the WPScan Vulnerability Report.

Workarounds

• Disable the Web Directory Free plugin entirely until the patch can be applied
• Implement WAF rules to block requests containing SQL injection payloads targeting the affected AJAX endpoints
• Use WordPress security plugins to add additional input validation layers
• Restrict access to WordPress AJAX endpoints at the web server level for non-essential functionality
• Consider using database user accounts with minimal privileges to limit potential damage from SQL injection