CVE-2017-20243: WordPress Car Park Booking Plugin SQL Injection Vulnerability

Technical summary

CVE-2017-20243 is a time-based SQL injection vulnerability in the WordPress Car Park Booking Plugin (October 17 version) residing in the booking-page endpoint. The flaw exists in insufficient input validation of the space_id parameter, which is processed directly into SQL queries without proper parameterization or escaping. Attackers can inject AND SLEEP() payloads via GET requests to establish boolean-based or time-based inference channels, enabling blind extraction of database contents. The vulnerability is classified as CWE-89 (SQL Injection) and carries a CVSS v3.1 score of 8.2 (HIGH severity) due to network accessibility, low attack complexity, and high confidentiality impact.

Business impact

Exploitation of this vulnerability exposes WordPress sites using the affected plugin to unauthorized database access. Attackers can exfiltrate customer booking information, email addresses, payment details, and administrator credentials. For car park or venue booking operations, this breach can result in customer privacy violations, regulatory compliance failures (GDPR, CCPA), reputational damage, and potential liability. The lack of authentication requirements means any Internet-facing WordPress instance running this plugin is at immediate risk.

Affected systems

The vulnerability affects WordPress Car Park Booking Plugin version from October 17. Organizations running this specific plugin version on WordPress installations are at risk. The provided CVE data does not list specific vendor patch versions, so administrators should verify their installed plugin version against the official WordPress plugin repository or contact the plugin developer for version confirmation and patch availability.

Exploitability

This vulnerability is readily exploitable by unauthenticated threat actors. The attack requires only network access to the WordPress booking page endpoint and basic SQL injection knowledge. No user interaction or authentication is required. Time-based SQL injection techniques are well-understood and can be automated using standard penetration testing tools. The straightforward exploitation path and lack of access controls make this a high-risk threat in practice, even though it is not currently listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Remediation

Immediately update the WordPress Car Park Booking Plugin to a patched version released after October 17, 2017. Verify the availability of security updates from the plugin developer or the WordPress plugin repository. If no patch is available, consider disabling or removing the plugin until an update is released. As a temporary mitigation, implement Web Application Firewall (WAF) rules to block requests containing SQL injection patterns (e.g., UNION, SLEEP, BENCHMARK keywords) in the space_id parameter and restrict direct access to the booking-page endpoint to known IP addresses if operationally feasible.

Patch guidance

Check the WordPress plugin repository or the plugin developer's official website for updates released after October 17, 2017. When a patch is available, apply it immediately via the WordPress admin dashboard or through manual file replacement. After patching, verify the plugin version in WordPress settings and test booking functionality to ensure the update did not introduce regressions. For organizations unable to patch immediately, prioritize this vulnerability for remediation within the next patch cycle. Document the patching timeline and any compensating controls implemented during the interim period.

Detection guidance

Monitor web server and WordPress logs for suspicious requests to the booking-page endpoint containing SQL keywords or unusual encoding patterns in the space_id parameter. Watch for GET requests with SLEEP, BENCHMARK, UNION, SELECT, or AND operators within the space_id value. Implement database activity monitoring to detect unusual query patterns or delays that may indicate time-based SQL injection attempts. Use security plugins or WAF solutions to alert on SQL injection attack signatures. Review web access logs for repeated requests from the same source with incrementally modified payloads, which are typical of blind SQL injection enumeration.

Why prioritize this

This vulnerability merits immediate attention due to its HIGH severity rating, unauthenticated exploitation requirements, and direct access to sensitive customer data. The lack of authentication barriers and high confidentiality impact make it an attractive target for threat actors. While not currently in CISA's KEV catalog, the straightforward exploitation and widespread WordPress adoption create material risk. Organizations should prioritize patching this vulnerability alongside critical infrastructure and payment processing systems.

Risk score, explained

The CVSS v3.1 score of 8.2 (HIGH) reflects: (1) network-based attack vector accessible to any Internet user; (2) low attack complexity requiring no special conditions; (3) no authentication required; (4) high confidentiality impact enabling database exfiltration; (5) low integrity impact possible through UPDATE/DELETE queries; and (6) no availability impact from this injection variant. The score does not account for exploitation prevalence, which would likely increase the practical risk assessment given the simplicity of the attack.

Frequently asked questions