Web Application Firewalls (WAF) Questions and Answers for Viva

Answer-1: A WAF is a security solution that protects web applications by filtering and monitoring HTTP traffic between a web application and the Internet.

Answer-2: To prevent attacks that target application layer vulnerabilities such as SQL injection, XSS, and CSRF.

Answer-3: AWS WAF, Cloudflare, Imperva, Akamai Kona, F5 BIG-IP ASM, and Azure WAF.

Answer-4: Traditional firewalls protect networks at the transport layer, while WAFs protect applications at the HTTP/HTTPS layer.

Answer-5: SQL injection, cross-site scripting (XSS), cross-site request forgery (CSRF), file inclusion, and more.

Answer-6: Some WAFs offer basic DDoS protection, but dedicated DDoS mitigation solutions are more effective.

Answer-7: A WAF that uses predefined patterns or signatures to detect known threats.

Answer-8: It detects threats by analyzing typical user behavior and spotting anomalies.

Answer-9: A model where only known good behavior is allowed; anything else is blocked.

Answer-10: A model where known bad behavior is blocked, while everything else is allowed.

Answer-11: It combines both positive and negative models for improved detection.

Answer-12: A list of the 10 most critical web application security risks, which WAFs often aim to mitigate.

Answer-13: A rule applied by a WAF to block known vulnerabilities before an actual patch is available.

Answer-14: They decrypt, inspect, and re-encrypt HTTPS traffic to analyze content securely.

Answer-15: The process of decrypting SSL/TLS traffic at the WAF before sending it to the backend server.

Answer-16: Yes, if not properly configured or updated, attackers can craft requests to bypass detection.

Answer-17: When legitimate traffic is incorrectly identified as malicious and blocked.

Answer-18: When a malicious request is not detected and is allowed through the WAF.

Answer-19: Inline (reverse proxy), out-of-band (monitoring), and transparent bridge mode.

Answer-20: A WAF hosted and managed in the cloud, requiring no on-premise infrastructure.

Answer-21: Scalability, ease of deployment, automatic updates, and global coverage.

Answer-22: A collection of security rules or policies that define what traffic is allowed or blocked.

Answer-23: A feature to control the number of requests from a single IP or session to prevent abuse.

Answer-24: Rules defined by users to meet specific application needs not covered by default rules.

Answer-25: Yes, modern WAFs can inspect and secure REST and SOAP APIs.

Answer-26: The ability of a WAF to detect and block automated bots from accessing web resources.

Answer-27: Adjusting rules and configurations to reduce false positives and improve accuracy.

Answer-28: Through logging, dashboards, and integration with SIEM tools.

Answer-29: Identifying unusual traffic patterns that may indicate attacks.

Answer-30: Blocking or allowing traffic based on geographic location.

Answer-31: Blocking traffic from known malicious IP addresses based on reputation databases.

Answer-32: Via APIs and automation tools, allowing for CI/CD pipeline integration.

Answer-33: Recording events and notifying admins of suspicious activity.

Answer-34: By enabling adaptive rules based on evolving traffic behavior.

Answer-35: A mode where the WAF observes traffic to suggest or auto-create rules.

Answer-36: Some advanced WAFs support WebSocket inspection, but many have limited capability.

Answer-37: It scans files for malware and enforces size/type restrictions.

Answer-38: Not always, but virtual patching and anomaly detection can help reduce the risk.

Answer-39: The ability to serve and isolate multiple customers or applications within a single WAF instance.

Answer-40: Maintaining multiple versions of rules/policies to track changes and roll back if needed.

Answer-41: Using pattern matching, heuristics, and sometimes behavioral analysis.

Answer-42: Adding challenges like CAPTCHA to distinguish bots from humans.

Answer-43: Helps meet requirements of regulations like PCI DSS, GDPR, and HIPAA by securing data and apps.

Answer-44: The sum of all the points where an unauthorized user could try to access data or systems.

Answer-45: By restricting input vectors and filtering malicious traffic before it reaches the application.

Answer-46: Yes, many CDNs now integrate WAF functionality to provide security with content delivery.

Answer-47: The delay introduced in processing traffic, which can be minimized with optimized configurations.

Answer-48: Regularly, especially when new threats emerge or the application changes.

Answer-49: Yes, logs can be forwarded to SIEMs for centralized monitoring and analysis.

Answer-50: WAF is perimeter-based protection, while RASP (Runtime Application Self-Protection) works from within the application.