Understanding PCI-DSS 6.4.3
The PCI-DSS 6.4.3 requirement specifically mandates rigorous management of scripts loaded and executed in consumer browsers, particularly on payment pages. This ensures scripts are authorized, their integrity is guaranteed, and their usage justified. This requirement emerged in response to rising client-side attacks like Magecart, designed to secretly capture sensitive cardholder data through compromised scripts.
Why PCI-DSS 6.4.3 Exists
Scripts running in consumer browsers are susceptible to manipulation. Malicious actors exploit these vulnerabilities to insert unauthorized scripts capable of stealing payment data. Common attacks include:
- Magecart Attacks: Malicious JavaScript is injected to capture sensitive payment details.
- Cross-Site Scripting (XSS): Attackers inject harmful scripts exploiting user sessions.
- Unauthorized Script Injections: Compromised or unauthorized scripts silently added to payment pages.
S4E.io Free Tools: PCI-DSS 6.4.3 Scanner
Our free tool scans your payment pages and identifies:
- Unauthorized scripts: Any scripts not explicitly authorized or documented.
- Script integrity issues: Scripts with modified or mismatched integrity values.
- Inline scripts: Potentially vulnerable inline JavaScript that should be moved to secure, externally-hosted files.
How S4E.io Protects Your Payment Pages
Authorized Scripts Only
Automatically detects and alerts on unauthorized scripts present on payment pages.
Integrity Verification
Calculates and validates integrity hashes (SRI) to ensure scripts have not been tampered with.
Comprehensive Script Inventory
Provides a detailed inventory of all scripts with alerts for undocumented or unjustified scripts.
Real-Time Alerts and Monitoring
Proactive notifications for immediate threat detection and remediation.
Benefits of Using S4E.io's PCI-DSS Scanner
- Quickly identify and remove unauthorized scripts.
- Maintain continuous compliance effortlessly.
- Protect your organization from client-side attacks.
- Gain peace of mind through proactive security monitoring.
Start Securing Your Payment Pages Today
Login to your S4E.io account to run a free PCI-DSS compliance check and ensure your client-side scripts are protected against emerging threats. For ongoing protection, continuous monitoring, and advanced insights, upgrade to a paid account or contact us.
To achieve and maintain compliance with PCI-DSS 6.4.3, follow the recommendations below:
- Maintain a complete and up-to-date inventory of all client-side scripts executing on payment pages.
- Authorize each script explicitly through documented approval processes.
- Implement Subresource Integrity (SRI) checks for all externally loaded scripts to ensure integrity.
- Use Content Security Policy (CSP) headers to restrict the sources from which scripts can be loaded.
- Avoid using inline scripts; move them to external files that can be integrity-verified.
- Establish continuous monitoring to detect unauthorized script changes in real-time.
- Regularly review and remove unused or undocumented scripts from production systems.
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