CVE-2017-20256: Unauthenticated SQL Injection in Joomla Survey Force Deluxe 3.2.4

Technical summary

The vulnerability exists in Joomla Survey Force Deluxe 3.2.4 as a CWE-89 SQL injection in the invite parameter. The component fails to properly sanitize or parameterize user input before constructing SQL queries, permitting unauthenticated attackers to submit arbitrary SQL via GET requests. The attack surface is network-accessible and carries no special access requirements. The CVSS 3.1 score of 8.2 (HIGH) reflects high confidentiality impact with partial integrity risk but no availability damage.

Business impact

A successful attack exposes sensitive data resident in the Joomla database—potentially including user credentials, email addresses, survey responses, and other configuration details. While the vulnerability does not allow deletion or modification of data at scale, partial integrity impact suggests certain write operations may be possible. Organizations running this component face exposure of customer or staff information, regulatory compliance violations, and reputational harm. The lack of authentication requirement dramatically lowers the barrier to exploitation.

Affected systems

Joomla Survey Force Deluxe version 3.2.4 is confirmed vulnerable. Administrators should verify whether this component is installed in their Joomla environment. Earlier and later versions should be evaluated against vendor guidance to confirm the exact vulnerable range. The vulnerability affects any Joomla installation with this component enabled and publicly accessible.

Exploitability

Exploitability is high. The attack requires only network access and can be mounted without authentication, credentials, or user interaction. A simple HTTP GET request with a crafted SQL payload is sufficient. The straightforward nature of SQL injection and the unauthenticated nature of this instance make it practical for opportunistic attackers. No exploit code is required—standard SQL injection techniques apply.

Remediation

Update Joomla Survey Force Deluxe to a patched version released after 3.2.4. Verify the exact version number in the vendor advisory before deploying. If an immediate patch is unavailable, disable or remove the Survey Force Deluxe component until a fix is confirmed. For defense-in-depth, implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the invite parameter, and restrict database user permissions to the minimum necessary.

Patch guidance

Check the Joomla Survey Force Deluxe vendor advisory or project repository for the first patched version after 3.2.4. Verify the version number before upgrading. Apply patches promptly, as the unauthenticated, network-accessible nature of this vulnerability means automated scanners and worms may target it. Test patches in a non-production environment first. If the component is not essential to operations, removal is a valid remediation.

Detection guidance

Monitor web application logs for GET requests to the Survey Force Deluxe component with suspicious SQL syntax in the invite parameter (e.g., single quotes, UNION, SELECT, OR clauses). Implement WAF rules to alert on SQL injection payloads. Query database access logs for unusual query patterns or queries issued by the web application user account that deviate from normal behavior. Monitor for unexpected data exfiltration or scanning activity. Intrusion detection systems should be tuned to flag SQL injection attempts against publicly facing Joomla installations.

Why prioritize this

This vulnerability merits rapid remediation due to unauthenticated, network-accessible exploitation, high confidentiality impact, and ease of attack. SQL injection in public-facing web applications is a mature attack vector with abundant tooling. The absence of authentication or user interaction removes friction. Even though data destruction is not possible, exposure of sensitive information poses regulatory and business risk. Organizations should treat this as a near-critical item if the component is exposed to untrusted networks.

Risk score, explained

The CVSS 3.1 score of 8.2 (HIGH) reflects: (1) high confidentiality impact from unrestricted database query access, (2) low complexity attack requiring only network connectivity, (3) no authentication required, (4) partial integrity risk from limited write capability, and (5) no availability impact. The absence of CISA KEV listing does not reduce risk; it reflects publication status rather than threat severity. Unauthenticated SQL injection against public-facing components justifies a score in the HIGH range.

Frequently asked questions