7 questions found
What is AWS WAF and how does it protect web applications from common attacks?
Beginner
AWS WAF, or Web Application Firewall, lets you create rules that inspect incoming web requests to your CloudFront distribution, Application Load Balancer, or API Gateway, and block or allow traffic based on conditions you define, such as blocking requests containing SQL injection patterns or cross site scripting attempts, protecting your application at the network edge before malicious requests ever reach your actual backend servers.
aws wafv2 create-web-acl --name my-web-acl --scope REGIONAL --default-action Allow={} --rules file://waf-rules.json
Real-world example
An e commerce website attaches AWS WAF rules to its Application Load Balancer that automatically block requests containing common SQL injection patterns, preventing attackers from exploiting vulnerabilities in the application's database queries.
Common follow-ups: What is the difference between AWS WAF's managed rule groups and custom rules?;Which AWS services can AWS WAF be attached to?
Amazon CloudFront & Content Delivery;Amazon API Gateway
What is AWS Shield, and what is the difference between Shield Standard and Shield Advanced?
Beginner
AWS Shield is a managed service that protects against distributed denial of service, or DDoS, attacks, with Shield Standard providing automatic, always on protection against common, most frequently occurring network and transport layer DDoS attacks at no additional cost to every AWS customer, while Shield Advanced provides more comprehensive protection against larger and more sophisticated attacks, along with additional features like detailed attack diagnostics, cost protection for scaling charges incurred during an attack, and access to the AWS DDoS Response Team.
aws shield describe-subscription
Real-world example
A financial services company subscribes to Shield Advanced to gain access to the DDoS Response Team and financial protection against unexpected scaling costs, given the potentially severe consequences of even a brief service disruption to their business.
Common follow-ups: What types of attacks does Shield Standard automatically protect against without any configuration?;What is the cost of Shield Advanced compared to Shield Standard?
Amazon CloudFront & Content Delivery;Elastic Load Balancing (ALB
NLB & CLB)
How do AWS WAF managed rule groups simplify protecting applications against common, well known attack patterns?
Intermediate
AWS Managed Rules for WAF are pre configured rule groups maintained and continuously updated by AWS or trusted third party security vendors, covering common threats such as the OWASP Top Ten web application vulnerabilities, known bad bot signatures, or specific application platform vulnerabilities, letting you add strong baseline protection to your application in minutes without needing to research and write every individual rule yourself.
aws wafv2 create-web-acl --name my-web-acl --scope REGIONAL --rules '[{"Name":"AWSManagedRulesCommonRuleSet","Priority":1,"Statement":{"ManagedRuleGroupStatement":{"VendorName":"AWS","Name":"AWSManagedRulesCommonRuleSet"}}}]'
Real-world example
A company launching a new web application quickly attaches the AWS Managed Rules Common Rule Set to their WAF configuration, immediately gaining protection against a broad range of well known web application vulnerabilities without writing a single custom rule.
Common follow-ups: How often are AWS managed rule groups updated to address new threats?;Can managed rules be combined with custom rules in the same web ACL?
AWS Security Hub & GuardDuty;Amazon CloudFront & Content Delivery
How does rate based rules in AWS WAF help mitigate application layer DDoS attacks and abusive traffic patterns?
Intermediate
A rate based rule in WAF automatically tracks the number of requests coming from a specific source IP address over a rolling five minute window, and if that count exceeds a threshold you define, WAF automatically blocks further requests from that source until the rate drops back below the threshold, providing an effective defense against application layer attacks like credential stuffing or content scraping that traditional network layer DDoS protections might not fully address.
aws wafv2 create-rule-group --name rate-limit-rule --scope REGIONAL --capacity 10 --rules '[{"Name":"RateLimit","Statement":{"RateBasedStatement":{"Limit":2000,"AggregateKeyType":"IP"}}}]'
Real-world example
A login page under a credential stuffing attack, where an attacker rapidly attempts many username and password combinations, uses a WAF rate based rule to automatically block any single IP address making more than a reasonable number of login attempts within five minutes.
Common follow-ups: What is the minimum rate limit threshold that can be configured for a rate based rule?;How do you handle legitimate high volume traffic sources like shared corporate networks?
AWS Security Hub & GuardDuty;Amazon API Gateway
How does AWS WAF Bot Control help distinguish between legitimate automated traffic and malicious bots?
Intermediate
AWS WAF Bot Control provides visibility into bot traffic hitting your application and lets you create rules to allow known good bots, such as legitimate search engine crawlers, while blocking or challenging traffic identified as coming from potentially malicious bots, such as those used for content scraping or automated account takeover attempts, using a combination of AWS's own threat intelligence and behavioral analysis.
aws wafv2 create-web-acl --name bot-control-acl --scope REGIONAL --rules '[{"Name":"AWSManagedRulesBotControlRuleSet","Priority":1,"Statement":{"ManagedRuleGroupStatement":{"VendorName":"AWS","Name":"AWSManagedRulesBotControlRuleSet"}}}]'
Real-world example
An online ticketing platform enables WAF Bot Control to automatically challenge suspicious automated traffic attempting to buy up large quantities of tickets the moment they go on sale, while still allowing legitimate search engine crawlers to index the site normally.
Common follow-ups: What is the difference between blocking and challenging suspicious bot traffic?;How does Bot Control distinguish good bots from bad bots technically?
Amazon CloudFront & Content Delivery;Amazon API Gateway
How does AWS Shield Advanced provide cost protection and access to specialized DDoS response support during a major attack?
Advanced
Shield Advanced includes cost protection, which credits back the additional charges you might incur from services like CloudFront, Route 53, or Elastic Load Balancing scaling up in response to a DDoS attack, along with twenty four by seven access to the AWS DDoS Response Team, who can help analyze an ongoing attack and assist in crafting effective mitigation rules in real time, providing both financial and expert operational support that goes well beyond what Shield Standard's automatic protection alone offers.
aws shield associate-drt-role --role-arn arn:aws:iam::123456789012:role/DRTAccessRole
Real-world example
A company experiencing a massive, sustained DDoS attack against its e commerce platform engages the AWS DDoS Response Team through its Shield Advanced subscription, receiving expert guidance to quickly craft effective WAF rules that successfully mitigate the attack within hours.
Common follow-ups: What specific costs does Shield Advanced's financial protection actually cover?;How do you grant the DDoS Response Team the access they need to help during an active incident?
AWS CloudTrail & Auditing;Amazon CloudFront & Content Delivery
How should an organization design a layered defense in depth strategy combining WAF, Shield, security groups, and network ACLs to protect a public facing application?
Advanced
A layered defense typically places Shield Standard or Advanced at the outermost layer for automatic DDoS protection, WAF next to filter application layer threats like SQL injection and bot traffic at services like CloudFront or an Application Load Balancer, security groups to enforce which specific ports and sources can reach individual EC2 instances or containers, and network ACLs as an additional stateless layer of subnet level filtering, together creating multiple independent layers of defense so that a weakness or misconfiguration in any single layer does not immediately compromise the entire application.
aws ec2 create-network-acl-entry --network-acl-id acl-12345 --rule-number 100 --protocol tcp --port-range From=443,To=443 --cidr-block 0.0.0.0/0 --rule-action allow
Real-world example
A company protecting a critical public facing payment application layers Shield Advanced for DDoS protection, WAF managed rules for application layer threats, restrictive security groups limiting instance access, and network ACLs for additional subnet level filtering, ensuring no single point of failure in their overall security posture.
Common follow-ups: How do you test that each layer of a defense in depth strategy is actually functioning correctly?;What is the performance overhead of adding multiple layers of security filtering?
VPC & Networking;AWS Security Hub & GuardDuty