AWS WAF | General

Question 1

What is AWS WAF?

General

AWS WAF | Security, Identity & Compliance

Answer 1

AWS WAF is a web application firewall that helps protect web applications from attacks by allowing you to configure rules that allow, block, or monitor (count) web requests based on conditions that you define. These conditions include IP addresses, HTTP headers, HTTP body, URI strings, SQL injection and cross-site scripting.

Question 2

How does AWS WAF block or allow traffic?

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AWS WAF | Security, Identity & Compliance

Answer 2

As the underlying service receives requests for your web sites, it forwards those requests to AWS WAF for inspection against your rules. Once a request meets a condition defined in your rules, AWS WAF instructs the underlying service to either block or allow the request based on the action you define.

Question 3

How does AWS WAF protect my web site or application?

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AWS WAF | Security, Identity & Compliance

Answer 3

AWS WAF is tightly integrated with Amazon CloudFront and the Application Load Balancer (ALB), services that AWS customers commonly use to deliver content for their websites and applications. When you use AWS WAF on Amazon CloudFront, your rules run in all AWS Edge Locations, located around the world close to your end users. This means security doesn’t come at the expense of performance. Blocked requests are stopped before they reach your web servers. When you use AWS WAF on Application Load Balancer, your rules run in region and can be used to protect internet-facing as well as internal load balancers.

Question 4

Can I use AWS WAF to protect web sites not hosted in AWS?

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AWS WAF | Security, Identity & Compliance

Answer 4

Yes, AWS WAF is integrated with Amazon CloudFront, which supports custom origins outside of AWS.

Question 5

What types of attacks can AWS WAF help me to stop?

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AWS WAF | Security, Identity & Compliance

Answer 5

AWS WAF helps protects your website from common attack techniques like SQL injection and Cross-Site Scripting (XSS). In addition, you can create rules that can block attacks from specific user-agents, bad bots, or content scrapers. See the AWS WAF Developer Guide for examples.

Question 6

Can I get a history of all AWS WAF API calls made on my account for security, operational or compliance auditing?

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AWS WAF | Security, Identity & Compliance

Answer 6

Yes. To receive a history of all AWS WAF API calls made on your account, you simply turn on AWS CloudTrail in the CloudTrail’s AWS Management Console. For more information, visit AWS CloudTrail home page or visit the AWS WAF Developer Guide.

Question 7

Does AWS WAF support IPv6?

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AWS WAF | Security, Identity & Compliance

Answer 7

Yes, support for IPv6 allows the AWS WAF to inspect HTTP/S requests coming from both IPv6 and IPv4 addresses.

Question 8

Does IPSet match condition for an AWS WAF Rule support IPv6?

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AWS WAF | Security, Identity & Compliance

Answer 8

Yes, you can setup new IPv6 match condition(s) for new and existing WebACLs, as per the documentation.

Question 9

Can I expect to see IPv6 address appear in the AWS WAF sampled requests where applicable?

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AWS WAF | Security, Identity & Compliance

Answer 9

Yes. The sampled requests will show the IPv6 address where applicable.

Question 10

Can I use IPv6 with all AWS WAF features?

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AWS WAF | Security, Identity & Compliance

Answer 10

Yes. You will be able to use all the existing features for traffic both over IPv6 and IPv4 without any discernable changes to performance, scalability or availability of the service.

Question 11

What services does AWS WAF support?

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AWS WAF | Security, Identity & Compliance

Answer 11

AWS WAF can be deployed on Amazon CloudFront and the Application Load Balancer (ALB). As part of Amazon CloudFront it can be part of your Content Distribution Network (CDN) protecting your resources and content at the Edge locations and as part of the Application Load Balancer it can protect your origin web servers running behind the ALBs.

Question 12

In what Regions is AWS WAF on ALB available in?

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AWS WAF | Security, Identity & Compliance

Answer 12

AWS WAF on ALB is available in the following AWS Regions.

Question 13

Is AWS WAF HIPAA eligible?

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AWS WAF | Security, Identity & Compliance

Answer 13

Yes, AWS has expanded its HIPAA compliance program to include AWS WAF as a HIPAA eligible service. If you have an executed Business Associate Agreement (BAA) with AWS, you can use AWS WAF to protect your web applications from common web exploits. For more information, see HIPAA Compliance.

Question 14

How does AWS WAF pricing work? Are there any upfront costs?

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AWS WAF | Security, Identity & Compliance

Answer 14

AWS WAF charges based on the number of web access control lists (web ACLs) that you create, the number of rules that you add per web ACL, and the number of web requests that you receive. There are no upfront commitments. AWS WAF charges are in addition to Amazon CloudFront Pricing and/or the Application Load Balancer (ALB) pricing.

Question 15

What is Rate-based Rule in AWS WAF?

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AWS WAF | Security, Identity & Compliance

Answer 15

Rate-based Rules are a new type of Rule that can be configured in AWS WAF. This feature allows you to specify the number of web requests that are allowed by a client IP in a trailing, continuously updated, 5 minute period. If an IP address breaches the configured limit, new requests will be blocked until the request rate falls below the configured threshold.

Question 16

How does a Rate-based rule compare to a regular AWS WAF Rule?

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AWS WAF | Security, Identity & Compliance

Answer 16

Rate-based Rules are similar to regular Rules, with one addition: the ability to configure a rate-based threshold. If, for example, the threshold for the Rate-based Rule is set to (say) 2,000, the rule will block all IPs that have more than 2,000 requests in the last 5 minute interval. Rate-based Rule can also contain any other AWS WAF Condition that a regular rule would?

Question 17

What does the Rate-based Rule cost?

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AWS WAF | Security, Identity & Compliance

Answer 17

A Rate-based Rule costs the same as a regular AWS WAF Rule which is $1 per rule per WebACL per month

Question 18

What are the use cases for the Rate-based Rule?

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AWS WAF | Security, Identity & Compliance

Answer 18

Here are some popular use cases customers can address with Rate-based rules:

I want to blacklist or count an IP address when that IP address exceeds the configured threshold rate (configurable in web requests per trailing 5 minute period)

I want to know which IP address are currently being blacklisted because they exceeded the configured threshold rate

I want IP addresses that have been added to the blacklist to be automatically removed when they are no longer violating the configured threshold rate

I want to exempt certain high-traffic source IP ranges from being blacklisted by my Rate-based rules

Question 19

Are the existing matching conditions compatible with the Rate-base Rule?

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AWS WAF | Security, Identity & Compliance

Answer 19

Yes. Rate-based rules are compatible with existing AWS WAF match conditions. This allows you to further refine your match criteria and limit rate-based mitigations to specific URLs of your website or traffic coming from specific referrers (or user agents) or add other custom match criteria.

Question 20

Can I use Rate-based rule to mitigate Web layer DDoS attacks?

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AWS WAF | Security, Identity & Compliance

Answer 20

Yes. This new rules type is designed to protect you from use cases such web-layer DDoS attacks, brute force login attempts and bad bots.

Question 21

What visibility features does Rate-based Rules offer?

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AWS WAF | Security, Identity & Compliance

Answer 21

Rate-based Rules support all the visibility features currently available on the regular AWS WAF Rules. Additionally, they will get visibility into the IP addresses blocked as a result of the Rate-based Rule.

Question 22

Can I use Rate-based rule to limit access to a certain parts of my Webpage?

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AWS WAF | Security, Identity & Compliance

Answer 22

Yes. Here is an example. Suppose that you want to limit requests to the login page on your website. To do this, you could add the following string match condition to a rate-based rule:

The Part of the request to filter on is “URI”.

The Match Type is “Starts with”.

A Value to match is “/login” (this need to be whatever identifies the login page in the URI portion of the web request)

Additionally, you would specify a Rate Limit of, say, 15,000 requests per 5 minutes. Adding this rate-based rule to a web ACL will limit requests to your login page per IP address without affecting the rest of your site.

Question 23

Can I exempt certain high-traffic source IP ranges from being blacklisted by my Rate-based Rule(s)?

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AWS WAF | Security, Identity & Compliance

Answer 23

Yes. You can do this by having an IP Whitelist condition within the Rate-base Rule.