PCI DSS v4.0 – a bite-size guide to automatically detecting and preventing web-based attacks on public facing web applications
To help organisations transition from PCI DSS v3.2.1 to PCI DSS v4.0 and maintain PCI compliance, Securious has developed a series of articles explaining how to implement the evolved requirements of the standard. This guide focuses on the requirements for automatically detecting and preventing web-based attacks on public-facing web applications.
Why protecting public-facing web applications is essential
Public-facing web applications are web applications that are accessible over the internet to users outside an organisation. These applications serve as the interface through which external users, such as customers, clients, or partners, interact with an organisation’s services and data.
Public-facing web applications are often targeted by attackers due to their accessibility and potential vulnerabilities. These applications, if compromised, can provide unauthorised access to cardholder data (CHD) and other sensitive information. PCI DSS v4.0 addresses these risks by emphasising the need for automated mechanisms to detect and prevent web-based attacks.
Key web-based threats
Several types of web-based attacks pose significant risks:
- SQL Injection: Attackers insert malicious SQL queries into input fields, gaining access to databases and sensitive data.
- Cross-Site Scripting (XSS): Malicious scripts are injected into web pages viewed by other users, stealing information or hijacking sessions.
- Cross-Site Request Forgery (CSRF): Attackers trick users into executing unwanted actions on web applications where they are authenticated.
- Remote File Inclusion (RFI): Attackers include remote files through web applications, leading to remote code execution or data theft.
How to automatically detect and prevent web-based attacks
1. Implement Web Application Firewalls (WAFs)
WAFs are essential tools for protecting public-facing web applications by filtering and monitoring HTTP traffic between a web application and the Internet.
WAFs can identify and block common attack patterns, such as SQL injection and XSS, based on predefined rules and real-time analysis. By blocking malicious requests before they reach the web application, WAFs prevent potential exploits and data breaches.
2. Conduct regular vulnerability scanning
Regular scanning of web applications for vulnerabilities helps in early detection and remediation of potential security flaws.
Use automated vulnerability scanners to identify known vulnerabilities in web applications and associated components, and implement continuous monitoring to detect new vulnerabilities as they arise.
3. Employ Intrusion Detection and Prevention Systems (IDPS)
IDPS can monitor network traffic for suspicious activities and take actions to block or alert on potential threats.
Network-Based IDPS can monitor traffic flowing through the network and detect malicious activities directed at web applications.
Host-Based IDPS can monitor and protect individual servers running web applications from
4. Implement Automated Threat Intelligence
Leverage automated threat intelligence to stay updated on emerging threats and adapt defences accordingly.
Use threat intelligence feeds to update WAFs and IDPS with the latest threat signatures and indicators of compromise (IOCs) and employ machine learning algorithms to identify and respond to new attack patterns based on historical data.
5. Continuous improvement
Regularly review and update your web application security measures to ensure they remain effective against evolving threats.
Conduct regular audits and assessments to verify the effectiveness of security controls and compliance with PCI DSS requirements and establish a feedback loop to incorporate findings from security incidents and vulnerability assessments into your security strategy.
To summarise
Protecting public-facing web applications from web-based attacks is crucial for maintaining PCI DSS compliance. By implementing automated detection and prevention mechanisms, organisations can significantly reduce the risk of security breaches and protect sensitive data.
For additional information on PCI DSS compliance or to discuss how Securious can help you safeguard your web applications, contact us today using the form below.