CVE-2019-25495: osCommerce SQL Injection Vulnerability

CVE-2019-25495 Overview

osCommerce 2.3.4.1 contains a SQL injection vulnerability that allows unauthenticated attackers to manipulate database queries by injecting SQL code through the reviews_id parameter. Attackers can send GET requests to product_reviews_write.php with malicious reviews_id values using boolean-based SQL injection payloads to extract sensitive database information.

Critical Impact

Unauthenticated attackers can exploit this SQL injection vulnerability to extract sensitive database information, potentially including customer credentials, payment details, and administrative access data from vulnerable osCommerce installations.

Affected Products

• osCommerce 2.3.4.1
• osCommerce e-commerce platform installations using the vulnerable product_reviews_write.php endpoint
• Web servers hosting osCommerce with network-accessible product review functionality

Discovery Timeline

• 2026-02-27 - CVE CVE-2019-25495 published to NVD
• 2026-03-04 - Last updated in NVD database

Technical Details for CVE-2019-25495

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) exists in the product review functionality of osCommerce 2.3.4.1. The application fails to properly sanitize user-supplied input in the reviews_id parameter before incorporating it into SQL queries. This allows attackers to inject arbitrary SQL code that is executed by the database server with the same privileges as the application's database user.

The vulnerability can be exploited remotely over the network without requiring any authentication or user interaction, making it particularly dangerous for publicly accessible osCommerce deployments. Successful exploitation enables attackers to read sensitive data from the database, including customer information, order details, and potentially administrative credentials.

Root Cause

The root cause of this vulnerability is improper input validation and lack of parameterized queries in the product_reviews_write.php file. The reviews_id parameter is directly concatenated into SQL queries without proper sanitization or the use of prepared statements, allowing malicious SQL code to be interpreted and executed by the database engine.

Attack Vector

The attack is conducted remotely over the network by sending specially crafted GET requests to the product_reviews_write.php endpoint. Attackers inject boolean-based SQL payloads through the reviews_id parameter, allowing them to infer database contents by observing differences in application responses.

Boolean-based blind SQL injection works by appending conditional statements to the query that evaluate to either true or false. By analyzing whether the application returns different responses based on these conditions, attackers can systematically extract database information one bit at a time. The vulnerability requires no authentication, meaning any network user can potentially exploit this flaw against vulnerable osCommerce installations.

For detailed technical information and proof-of-concept examples, see the Exploit-DB #46330 entry and the VulnCheck Advisory on OsCommerce SQL Injection.

Detection Methods for CVE-2019-25495

Indicators of Compromise

• HTTP GET requests to product_reviews_write.php containing unusual characters in the reviews_id parameter such as single quotes, AND, OR, or UNION keywords
• Database error messages appearing in web server logs or application responses that indicate SQL syntax errors
• Abnormal database query patterns or increased query execution times originating from the web application
• Unexpected data exfiltration patterns in network traffic following requests to the product reviews endpoint

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in the reviews_id parameter
• Deploy intrusion detection systems (IDS) configured to identify SQL injection attack signatures in HTTP traffic
• Enable detailed database query logging to identify suspicious queries containing injection payloads
• Monitor application logs for error messages related to SQL syntax or database query failures

Monitoring Recommendations

• Configure real-time alerting for any requests to product_reviews_write.php containing SQL keywords or special characters
• Implement database activity monitoring to detect unusual data access patterns or large data retrievals
• Set up log aggregation and correlation to identify coordinated attack attempts across multiple parameters
• Regularly audit web server access logs for reconnaissance activity targeting osCommerce endpoints

How to Mitigate CVE-2019-25495

Immediate Actions Required

• Restrict network access to the osCommerce administration panel and sensitive endpoints until patching is complete
• Deploy a Web Application Firewall with SQL injection protection rules as a temporary defensive measure
• Review database user privileges to ensure the application uses least-privilege access principles
• Back up all database contents and implement monitoring for unauthorized data access

Patch Information

Organizations running osCommerce 2.3.4.1 should check the OsCommerce Official Site for security updates and patches addressing this SQL injection vulnerability. Review the VulnCheck Advisory on OsCommerce SQL Injection for detailed remediation guidance.

Workarounds

• Implement input validation at the application level to ensure reviews_id only accepts numeric values
• Deploy a reverse proxy or WAF to filter requests containing SQL injection patterns before they reach the application
• Temporarily disable the product review write functionality by restricting access to product_reviews_write.php until a proper fix is applied
• Consider migrating to a more actively maintained e-commerce platform if official patches are not available

# Configuration example - Apache .htaccess to restrict access to vulnerable endpoint
<Files "product_reviews_write.php">
    Order deny,allow
    Deny from all
    # Allow only from trusted admin IPs
    # Allow from 192.168.1.100
</Files>