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Question 297 - SCS-C02 discussion

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A company has a web-based application that runs behind an Application Load Balancer (ALB). The application is experiencing a credential stuffing attack that is producing many failed login attempts. The attack is coming from many IP addresses. The login attempts are using a user agent string of a known mobile device emulator.

A security engineer needs to implement a solution to mitigate the credential stuffing attack. The solution must still allow legitimate logins to the application.

Which solution will meet these requirements?

A.
Create an Amazon CloudWatch alarm that reacts to login attempts that contain the specified user agent string. Add an Amazon Simple Notification Service (Amazon SNS) topic to the alarm.
Answers
A.
Create an Amazon CloudWatch alarm that reacts to login attempts that contain the specified user agent string. Add an Amazon Simple Notification Service (Amazon SNS) topic to the alarm.
B.
Modify the inbound security group on the ALB to deny traffic from the IP addresses that are involved in the attack.
Answers
B.
Modify the inbound security group on the ALB to deny traffic from the IP addresses that are involved in the attack.
C.
Create an AWS WAF web ACL for the ALB. Create a custom rule that blocks requests that contain the user agent string of the device emulator.
Answers
C.
Create an AWS WAF web ACL for the ALB. Create a custom rule that blocks requests that contain the user agent string of the device emulator.
D.
Create an AWS WAF web ACL for the ALB Create a custom rule that allows requests from legitimate user agent strings
Answers
D.
Create an AWS WAF web ACL for the ALB Create a custom rule that allows requests from legitimate user agent strings
Suggested answer: C

Explanation:

To mitigate a credential stuffing attack against a web-based application behind an Application Load Balancer (ALB), creating an AWS WAF web ACL with a custom rule to block requests containing the known malicious user agent string is an effective solution. This approach allows for precise targeting of the attack vector (the user agent string of the device emulator) without impacting legitimate users. AWS WAF provides the capability to inspect HTTP(S) requests and block those that match defined criteria, such as specific strings in the user agent header, thereby preventing malicious requests from reaching the application.

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asked 16/09/2024
Pieter Louw
44 questions
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