CVE-2024-54361: Instant Appointment SQLi Vulnerability

CVE-2024-54361 Overview

CVE-2024-54361 is an SQL Injection vulnerability affecting the Instant Appointment WordPress plugin developed by tenteeglobal. The vulnerability exists due to improper neutralization of special elements used in SQL commands, allowing attackers to manipulate database queries through malicious input. This flaw enables unauthorized access to sensitive data stored in the WordPress database, potentially leading to full database compromise.

Critical Impact

Attackers can exploit this SQL Injection vulnerability to extract sensitive information from the WordPress database, modify or delete data, and potentially achieve unauthorized access to the underlying system.

Affected Products

• WordPress Instant Appointment plugin version 1.2 and earlier
• All installations of instant-appointment plugin through version 1.2

Discovery Timeline

• 2024-12-16 - CVE-2024-54361 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2024-54361

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) occurs when user-supplied input is incorporated into SQL queries without proper sanitization or parameterization. The Instant Appointment plugin fails to adequately validate and escape input data before using it in database operations, creating an entry point for malicious SQL code injection.

WordPress plugins that handle appointment scheduling typically process user input through forms and AJAX requests. When these inputs are directly concatenated into SQL statements rather than using prepared statements with parameterized queries, attackers can inject arbitrary SQL syntax to manipulate the query logic.

Root Cause

The root cause of this vulnerability is the improper neutralization of special SQL characters in user input. The plugin does not employ WordPress's built-in database abstraction layer ($wpdb->prepare()) or equivalent parameterized query mechanisms, allowing SQL metacharacters to be interpreted as part of the query structure rather than as literal data values.

Attack Vector

An attacker can exploit this vulnerability by submitting specially crafted input containing SQL injection payloads through the plugin's appointment functionality. The malicious input would typically be submitted through form fields or request parameters that the plugin processes for database operations.

The exploitation mechanism involves injecting SQL syntax that modifies the intended query behavior. For example, an attacker might use UNION-based injection to extract data from other tables, boolean-based blind injection to infer database contents, or time-based blind injection when direct output is not visible. Technical details and analysis can be found in the Patchstack Vulnerability Analysis.

Detection Methods for CVE-2024-54361

Indicators of Compromise

• Unusual database queries in WordPress logs containing SQL injection patterns such as UNION SELECT, OR 1=1, or time-delay functions
• Unexpected database errors or application behavior in appointment-related functionality
• Evidence of data exfiltration or unauthorized database access in server logs
• Anomalous requests to appointment plugin endpoints with encoded or special characters

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in requests to WordPress
• Monitor database query logs for suspicious query patterns or syntax errors indicative of injection attempts
• Deploy SentinelOne Singularity to detect post-exploitation activities and lateral movement following successful SQL injection attacks
• Review Apache/Nginx access logs for requests containing SQL metacharacters targeting the instant-appointment plugin

Monitoring Recommendations

• Enable WordPress debug logging to capture database errors that may indicate exploitation attempts
• Configure database audit logging to track all queries executed against the WordPress database
• Set up alerting for failed login attempts or privilege escalation that may follow successful data extraction
• Monitor for creation of new administrative users or modification of existing user privileges

How to Mitigate CVE-2024-54361

Immediate Actions Required

• Deactivate and remove the Instant Appointment plugin version 1.2 or earlier from all WordPress installations
• Review database logs for signs of prior exploitation or unauthorized access
• Audit WordPress user accounts for any unauthorized additions or privilege changes
• Reset database credentials if exploitation is suspected

Patch Information

Review the Patchstack Vulnerability Analysis for the latest information on available patches. Users should check for plugin updates from tenteeglobal and apply the latest version that addresses this vulnerability. If no patch is available, consider using an alternative appointment scheduling plugin.

Workarounds

• Deploy a Web Application Firewall (WAF) with SQL injection protection rules to filter malicious requests
• Implement input validation at the server level using security plugins such as Wordfence or Sucuri
• Restrict database user privileges for the WordPress installation to minimize the impact of successful injection
• Consider disabling the plugin entirely until a security patch is released by the vendor

# WordPress CLI commands to disable the vulnerable plugin
wp plugin deactivate instant-appointment --path=/var/www/html/wordpress
wp plugin delete instant-appointment --path=/var/www/html/wordpress

# Verify plugin removal
wp plugin list --path=/var/www/html/wordpress | grep instant-appointment