CVE-2024-0610: Piraeus Bank WooCommerce Gateway SQLi Flaw

CVE-2024-0610 Overview

The Piraeus Bank WooCommerce Payment Gateway plugin for WordPress contains a time-based blind SQL Injection vulnerability in the MerchantReference parameter. This security flaw affects all versions up to and including 1.6.5.1 and stems from insufficient escaping of user-supplied input combined with inadequate preparation of SQL queries. The vulnerability enables unauthenticated attackers to inject malicious SQL queries that can extract sensitive information from the WordPress database.

Critical Impact

Unauthenticated attackers can exploit this SQL injection flaw to extract sensitive data from the database, potentially compromising customer payment information, user credentials, and other confidential e-commerce data stored by WordPress and WooCommerce.

Affected Products

• Papaki Piraeus Bank WooCommerce Payment Gateway versions up to and including 1.6.5.1
• WordPress installations with the vulnerable plugin installed
• WooCommerce stores utilizing Piraeus Bank payment processing

Discovery Timeline

• 2024-02-17 - CVE-2024-0610 published to NVD
• 2025-02-26 - Last updated in NVD database

Technical Details for CVE-2024-0610

Vulnerability Analysis

This vulnerability represents a classic time-based blind SQL injection flaw in the WordPress plugin ecosystem. The MerchantReference parameter, which is typically used to identify payment transactions, fails to properly sanitize user input before incorporating it into SQL queries. Because the injection is "blind," attackers cannot directly observe query results in the application response. Instead, they leverage time-based techniques where deliberately slow SQL operations (using functions like SLEEP() or BENCHMARK()) allow them to infer database contents based on response timing delays.

The vulnerability is particularly concerning because it requires no authentication, meaning any remote attacker can exploit it without needing valid credentials. This significantly expands the attack surface and makes the plugin an attractive target for automated vulnerability scanners and opportunistic attackers.

Root Cause

The root cause of CVE-2024-0610 is a failure to implement proper input validation and parameterized queries in the plugin's database interaction layer. Specifically:

1. The MerchantReference parameter lacks proper escaping using WordPress's built-in sanitization functions
2. The SQL query construction uses string concatenation rather than prepared statements with placeholders
3. No input validation restricts the parameter to expected formats or character sets

WordPress provides the $wpdb->prepare() method specifically to prevent SQL injection, but the vulnerable code bypasses this protection by directly incorporating user input into query strings.

Attack Vector

The attack is executed remotely over the network against WordPress installations running the vulnerable plugin. An attacker can craft malicious HTTP requests containing SQL injection payloads in the MerchantReference parameter. The time-based blind technique involves injecting conditional statements that cause measurable delays when conditions are true, allowing attackers to systematically extract database information character by character.

For example, an attacker might inject payloads that check if specific tables exist, enumerate database schemas, or extract sensitive data like user credentials and payment details. The attack requires no special privileges and can be performed by any network-connected adversary.

Detection Methods for CVE-2024-0610

Indicators of Compromise

• Unusual HTTP requests to payment gateway endpoints containing SQL syntax characters such as single quotes, UNION statements, or time-delay functions like SLEEP()
• Abnormally long response times for payment-related requests that may indicate time-based SQL injection attempts
• Database query logs showing unexpected or malformed queries originating from the payment gateway plugin
• Web server access logs with suspicious MerchantReference parameter values containing encoded or obfuscated SQL commands

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP parameters
• Enable WordPress database query logging and monitor for anomalous query patterns or errors
• Implement application-level monitoring for requests with SQL injection signatures targeting WooCommerce endpoints
• Configure intrusion detection systems (IDS) to alert on time-based SQL injection attack patterns

Monitoring Recommendations

• Review web server access logs regularly for requests containing SQL injection indicators such as SLEEP(), BENCHMARK(), WAITFOR, or UNION SELECT
• Monitor database server performance for unusual CPU spikes or query execution delays that may indicate active exploitation
• Set up alerting for failed or anomalous payment gateway transactions that could mask attack attempts
• Audit WordPress plugin update status and ensure vulnerability scanning includes third-party payment plugins

How to Mitigate CVE-2024-0610

Immediate Actions Required

• Update the Piraeus Bank WooCommerce Payment Gateway plugin to the latest patched version immediately
• Review database access logs for evidence of exploitation attempts or successful data extraction
• If compromise is suspected, rotate all database credentials and WordPress administrator passwords
• Consider temporarily disabling the plugin until the update can be verified and applied

Patch Information

The vendor has released a security patch addressing this vulnerability. The fix is available through the WordPress Plugin Changeset which implements proper input sanitization and prepared statements for database queries. Additional technical details are available in the Wordfence Vulnerability Report.

Workarounds

• Implement WAF rules to block requests containing SQL injection patterns targeting the MerchantReference parameter
• Restrict network access to payment gateway endpoints using IP allowlisting where feasible
• Deploy a WordPress security plugin with SQL injection protection capabilities as an additional defense layer
• Consider using a database firewall that can detect and block malicious SQL queries at the database level

# Example: Block SQL injection patterns in Apache .htaccess
# Add to WordPress root .htaccess file
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} (union|select|insert|drop|delete|update|concat|sleep|benchmark) [NC]
RewriteRule .* - [F,L]
</IfModule>