CVE-2019-25433: XOOPS CMS SQLi — Patch Guide

Overview

A significant SQL injection vulnerability exists in XOOPS CMS version 2.5.9. This flaw allows attackers without any login credentials to execute malicious commands on the database by manipulating a specific parameter in a web request. Successful exploitation could lead to the theft of sensitive information stored within the CMS database.

Vulnerability Details

The vulnerability is located in the gerar_pdf.php file. This script improperly handles user-supplied input passed through the cid parameter in a GET request. Because the input is not sanitized or validated, an attacker can craft a request containing malicious SQL code within the cid value. When processed, this code becomes part of the database query, allowing the attacker to read, modify, or delete data.

Attack Vector: An attacker can exploit this by simply navigating to a specially crafted URL in a web browser or using common web attack tools.

Potential Impact

The primary risk is unauthorized access to the entire underlying database. This could result in:

• Data Breach: Extraction of sensitive information, including user credentials (often hashed), personal user data, site content, and configuration details.
• Data Manipulation: Alteration or deletion of website content, user accounts, or system settings.
• System Compromise: In some database configurations, this could be used as a foothold for further attacks on the server.

Given that no authentication is required, the vulnerability is particularly dangerous and easy to exploit.

Remediation and Mitigation

The most effective action is immediate patching. The XOOPS development team has addressed this issue in later releases.

1. Immediate Patching (Recommended): Upgrade XOOPS to the latest stable version immediately. This is the only way to fully resolve the vulnerability. Always test upgrades in a staging environment first.

2. Temporary Mitigation (If Immediate Upgrade is Not Possible):

   • Access Restriction: Use a web application firewall (WAF) or server-level rules (e.g., .htaccess for Apache) to block direct public access to the gerar_pdf.php file.
   • Input Validation: If you have development resources, modify the gerar_pdf.php script to strictly validate the cid parameter. It should only accept expected data types (e.g., integers) and reject any input containing SQL special characters. Note: This is a temporary fix; upgrading is still required.

3. General Security Posture:

   • Principle of Least Privilege: Ensure the database user account for XOOPS has only the minimum permissions necessary.
   • Regular Updates: Maintain a schedule to promptly apply security updates for all CMS components and extensions.

All administrators of XOOPS 2.5.9 should treat this as a high-priority issue and apply the update without delay.