CVE-2017-20256 - Joomla Survey Force Deluxe SQL Injection Vulnerability

CVE-2017-20256 identifies a critical SQL injection vulnerability within Joomla Survey Force Deluxe component version 3.2.4. This flaw allows unauthenticated threat actors to remotely execute arbitrary SQL queries against the underlying database. The vulnerability specifically arises from insufficient sanitization of user-supplied input in the invite parameter during GET requests. Attackers can leverage this by crafting malicious SQL payloads within this parameter, leading to information disclosure. Exploitation grants adversaries the ability to extract sensitive data, including user credentials, configuration details, and other proprietary information stored in the database. This vulnerability poses a significant risk to organizations using the affected Joomla component, as successful exploitation can compromise the integrity and confidentiality of their web applications and backend data stores.

Attack Chain

1. Reconnaissance: Attacker identifies a Joomla instance running the vulnerable Survey Force Deluxe component (version 3.2.4 or earlier).
2. Vulnerability Identification: Attacker identifies that the invite parameter in the component's GET requests is susceptible to SQL injection.
3. Payload Crafting: Attacker crafts a malicious SQL payload designed to extract database information. This payload is URL-encoded for inclusion in a GET request.
4. Initial Access (SQL Injection): Attacker sends an unauthenticated HTTP GET request to the vulnerable Joomla endpoint, embedding the crafted SQL payload within the invite parameter (e.g., index.php?option=com_surveyforce&task=view&invite=[SQL_PAYLOAD]).
5. Database Query Execution: The vulnerable component processes the request without proper input sanitization, leading to the execution of the attacker's arbitrary SQL query on the backend database.
6. Data Exfiltration: The web server returns the results of the executed SQL query as part of the HTTP response, allowing the attacker to extract sensitive information from the database (e.g., table names, column data, user credentials).
7. Impact: Attacker gains unauthorized access to sensitive data, potentially leading to further compromise of the web application or associated systems.

Impact

The successful exploitation of CVE-2017-20256 can lead to severe consequences for affected organizations. Unauthenticated attackers can extract any data stored in the Joomla database, including user account details, administrative credentials, session tokens, and sensitive organizational information. This information can then be used for further attacks, such as account takeover, defacement, or lateral movement within the network. While specific victim counts are not available, any organization utilizing Joomla with the unpatched Survey Force Deluxe component 3.2.4 or earlier is at risk of significant data breaches and reputational damage.

Recommendation

• Patch CVE-2017-20256: Immediately upgrade Joomla Survey Force Deluxe to a version higher than 3.2.4 or disable the component if an upgrade is not feasible, to remediate CVE-2017-20256.
• Deploy Sigma Rules: Deploy the provided Sigma rules (Detect CVE-2017-20256 Exploitation - Generic SQLi in Query and Detect CVE-2017-20256 Exploitation - invite Parameter SQLi) to your web server/WAF logs to detect exploitation attempts.
• Web Application Firewall (WAF) Configuration: Configure your WAF to detect and block common SQL injection patterns, especially those targeting GET request parameters like invite.
• Review Web Server Logs: Regularly review web server logs for suspicious GET requests containing SQL injection syntax, especially those directed at Joomla components.