CVE-2025-0308: Ultimate Member Plugin SQLi Vulnerability

CVE-2025-0308 Overview

The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin for WordPress is vulnerable to time-based SQL Injection via the search parameter in all versions up to, and including, 2.9.1. This vulnerability exists due to insufficient escaping on the user-supplied parameter and lack of sufficient preparation on the existing SQL query. Unauthenticated attackers can append additional SQL queries into already existing queries, enabling extraction of sensitive information from the database.

Critical Impact

Unauthenticated attackers can exploit this SQL Injection vulnerability to extract sensitive information from WordPress databases, potentially including user credentials, personal information, and other confidential data stored in affected sites.

Affected Products

• Ultimate Member WordPress Plugin versions up to and including 2.9.1
• WordPress sites utilizing the Ultimate Member plugin for user management
• Member Directory functionality within the Ultimate Member plugin

Discovery Timeline

• 2025-01-18 - CVE CVE-2025-0308 published to NVD
• 2025-02-25 - Last updated in NVD database

Technical Details for CVE-2025-0308

Vulnerability Analysis

This vulnerability is classified as CWE-89 (SQL Injection), specifically manifesting as a time-based blind SQL Injection. The vulnerability resides in the Member Directory functionality of the Ultimate Member plugin, where the search parameter is processed without proper sanitization or parameterized query preparation.

Time-based SQL Injection allows attackers to infer database contents by observing response time variations. When an attacker injects SQL commands that cause conditional time delays (such as SLEEP() functions in MySQL), they can determine whether specific conditions are true or false based on how long the server takes to respond. This technique enables complete database enumeration without visible error messages or direct data output.

The vulnerability is particularly severe because it requires no authentication, meaning any external attacker can target vulnerable WordPress installations hosting the Ultimate Member plugin.

Root Cause

The root cause of this vulnerability lies in the class-member-directory.php file, specifically around line 1877 in version 2.9.1. The search parameter received from user input is incorporated directly into SQL queries without sufficient escaping or use of prepared statements. WordPress provides the $wpdb->prepare() method for parameterized queries, but this protection was not adequately implemented for the affected search functionality.

Attack Vector

The attack vector is network-based and requires no user interaction or prior authentication. An attacker can craft malicious HTTP requests containing SQL injection payloads in the search parameter when accessing the Member Directory feature. The time-based nature of the injection means the attack can be automated using tools that measure response times to systematically extract database contents character by character.

A typical attack scenario involves the attacker sending search queries with embedded SQL commands that cause measurable delays when specific conditions are met. By iterating through possible values and timing the responses, the attacker can reconstruct sensitive data including usernames, email addresses, password hashes, and any other information stored in the WordPress database.

Detection Methods for CVE-2025-0308

Indicators of Compromise

• Unusual patterns in web server access logs showing repeated requests to Member Directory endpoints with encoded or suspicious search parameters
• Database query logs revealing abnormally long-running queries or queries containing SQL functions like SLEEP(), BENCHMARK(), or WAITFOR
• Increased response times on Member Directory pages that correlate with sequential requests from the same source IP
• Web Application Firewall (WAF) alerts for SQL injection patterns in request parameters

Detection Strategies

• Deploy Web Application Firewall rules specifically targeting SQL injection patterns in search parameters
• Enable detailed query logging on the WordPress database server and monitor for time-based SQL injection signatures
• Implement anomaly detection for response time variations on the Member Directory functionality
• Utilize SentinelOne's Singularity Platform to detect and block malicious request patterns at the endpoint level

Monitoring Recommendations

• Configure real-time alerting for SQL injection signatures detected in HTTP request logs
• Monitor database server CPU and query execution times for anomalies indicative of time-based attacks
• Implement rate limiting on Member Directory search functionality to slow down automated extraction attempts
• Review access logs regularly for patterns of sequential requests with incrementally modified search parameters

How to Mitigate CVE-2025-0308

Immediate Actions Required

• Update the Ultimate Member plugin to the latest patched version immediately
• Temporarily disable the Member Directory feature if an immediate update is not possible
• Implement Web Application Firewall rules to filter SQL injection attempts targeting the search parameter
• Audit database access logs for any evidence of prior exploitation
• Consider rotating database credentials and sensitive user data if compromise is suspected

Patch Information

Organizations using the Ultimate Member plugin should update beyond version 2.9.1 to receive the security fix for this vulnerability. The patch addresses the SQL injection by implementing proper input sanitization and prepared statements for the search parameter in the Member Directory functionality. Refer to the WordPress Ultimate Member Code for technical details on the affected code, and the Wordfence Vulnerability Report for additional advisory information.

Workarounds

• Disable or restrict access to the Member Directory search functionality until patching is complete
• Implement server-level input validation using ModSecurity or similar WAF solutions with rules to block SQL injection patterns
• Restrict database user privileges to limit the potential impact of SQL injection exploitation
• Enable WordPress maintenance mode to prevent public access during the patching process

# Example: Block suspicious search parameter patterns in .htaccess
# Add to WordPress root .htaccess file as temporary mitigation
RewriteEngine On
RewriteCond %{QUERY_STRING} (union|select|insert|update|delete|benchmark|sleep|waitfor) [NC]
RewriteRule ^.*$ - [F,L]