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Question 251 - SCS-C02 discussion

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A company is using AWS to run a long-running analysis process on data that is stored in Amazon S3 buckets. The process runs on a fleet of Amazon EC2 instances that are in an Auto Scaling group. The EC2 instances are deployed in a private subnet Of a VPC that does not have internet access. The EC2 instances and the S3 buckets are in the same AWS account

The EC2 instances access the S3 buckets through an S3 gateway endpoint that has the default access policy. Each EC2 instance is associated With an instance profile role that has a policy that explicitly allows the s3:GetObject action and the s3:PutObject action for only the required S3 buckets.

The company learns that one or more of the EC2 instances are compromised and are exfiltrating data to an S3 bucket that is outside the companys organization in AWS Organizations. A security engtneer must implement a solution to stop this exfiltration of data and to keep the EC2 processing job functional.

Which solution will meet these requirements?

A.
Update the policy on the S3 gateway endpoint to allow the S3 actions CY11y if the values of the aws:ResourceOrglD and aws:PrincipalOrglD condition keys match the companys values.
Answers
A.
Update the policy on the S3 gateway endpoint to allow the S3 actions CY11y if the values of the aws:ResourceOrglD and aws:PrincipalOrglD condition keys match the companys values.
B.
Update the policy on the instance profile role to allow the S3 actions only if the value of the aws:ResourceOrglD condition key matches the company's value.
Answers
B.
Update the policy on the instance profile role to allow the S3 actions only if the value of the aws:ResourceOrglD condition key matches the company's value.
C.
Add a network ACL rule to the subnet of the EC2 instances to block outgoing connections on port 443.
Answers
C.
Add a network ACL rule to the subnet of the EC2 instances to block outgoing connections on port 443.
D.
Apply an SCP on the AWS account to allow the $3 actions only if the values of the aws:ResourceOrglD and aws:PrincipalOrglD condition keys match the company's values.
Answers
D.
Apply an SCP on the AWS account to allow the $3 actions only if the values of the aws:ResourceOrglD and aws:PrincipalOrglD condition keys match the company's values.
Suggested answer: D

Explanation:

The correct answer is D.

To stop the data exfiltration from the compromised EC2 instances, the security engineer needs to implement a solution that can deny access to any S3 bucket that is outside the company's organization. The solution should also allow the EC2 instances to access the required S3 buckets within the company's organization for the analysis process.

Option A is incorrect because updating the policy on the S3 gateway endpoint will not affect the access to S3 buckets that are outside the company's organization. The S3 gateway endpoint only applies to S3 buckets that are in the same AWS Region as the VPC. The compromised EC2 instances can still access S3 buckets in other Regions or other AWS accounts through the internet gateway or NAT device.

Option B is incorrect because updating the policy on the instance profile role will not prevent the compromised EC2 instances from using other credentials or methods to access S3 buckets outside the company's organization. The instance profile role only applies to requests that are made using the credentials of that role. The compromised EC2 instances can still use other IAM users, roles, or access keys to access S3 buckets outside the company's organization.

Option C is incorrect because adding a network ACL rule to block outgoing connections on port 443 will also block legitimate connections to S3 buckets within the company's organization. The network ACL rule will prevent the EC2 instances from accessing any S3 bucket through HTTPS, regardless of whether it is inside or outside the company's organization.

Option D is correct because applying an SCP on the AWS account will effectively deny access to any S3 bucket that is outside the company's organization. The SCP will apply to all IAM users, roles, and resources in the AWS account, regardless of how they access S3. The SCP will use the aws:ResourceOrgID and aws:PrincipalOrgID condition keys to check whether the S3 bucket and the principal belong to the same organization as the AWS account. If they do not match, the SCP will deny the S3 actions.

Using service control policies

AWS Organizations service control policy examples

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asked 16/09/2024
Sukhpreet Sidhu
40 questions
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