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A company's engineering team is developing a new application that creates IAM Key Management Service (IAM KMS) CMK grants for users immediately after a grant IS created users must be able to use the CMK tu encrypt a 512-byte payload. During load testing, a bug appears |intermittently where AccessDeniedExceptions are occasionally triggered when a user rst attempts to encrypt using the CMK Which solution should the c0mpany's security specialist recommend'?
A company Is planning to use Amazon Elastic File System (Amazon EFS) with its on-premises servers. The company has an existing IAM Direct Connect connection established between its on-premises data center and an IAM Region Security policy states that the company's on-premises firewall should only have specific IP addresses added to the allow list and not a CIDR range. The company also wants to restrict access so that only certain data center-based servers have access to Amazon EFS How should a security engineer implement this solution''
A company is implementing new compliance requirements to meet customer needs. According to the new requirements the company must not use any Amazon RDS DB instances or DB clusters that lack encryption of the underlying storage. The company needs a solution that will generate an email alert when an unencrypted DB instance or DB cluster is created. The solution also must terminate the unencrypted DB instance or DB cluster. Which solution will meet these requirements in the MOST operationally efficient manner?
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Question 310 - SCS-C02 discussion

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A security engineer is configuring account-based access control (ABAC) to allow only specific principals to put objects into an Amazon S3 bucket. The principals already have access to Amazon S3.

The security engineer needs to configure a bucket policy that allows principals to put objects into the S3 bucket only if the value of the Team tag on the object matches the value of the Team tag that is associated with the principal. During testing, the security engineer notices that a principal can still put objects into the S3 bucket when the tag values do not match.

Which combination of factors are causing the PutObject operation to succeed when the tag values are different? (Select TWO.)

A.
The principal's identity-based policy grants access to put objects into the S3 bucket with no conditions.
Answers
A.
The principal's identity-based policy grants access to put objects into the S3 bucket with no conditions.
B.
The principal's identity-based policy overrides the condition because the identity-based policy contains an explicit allow.
Answers
B.
The principal's identity-based policy overrides the condition because the identity-based policy contains an explicit allow.
C.
The S3 bucket's resource policy does not deny access to put objects.
Answers
C.
The S3 bucket's resource policy does not deny access to put objects.
D.
The S3 bucket's resource policy cannot allow actions to the principal.
Answers
D.
The S3 bucket's resource policy cannot allow actions to the principal.
E.
The bucket policy does not apply to principals in the same zone of trust.
Answers
E.
The bucket policy does not apply to principals in the same zone of trust.
Suggested answer: A, B

Explanation:

The correct answer is A and B. The principal's identity-based policy grants access to put objects into the S3 bucket with no conditions, and the principal's identity-based policy overrides the condition because the identity-based policy contains an explicit allow.

The reason is that when evaluating access requests, AWS uses a combination of resource-based policies (such as bucket policies) and identity-based policies (such as IAM user policies) to determine whether to allow or deny the action. According to the AWS documentation1, ''If an explicit allow exists in either the resource-based policy or the identity-based policy, then AWS allows access to the resource.'' Therefore, even if the bucket policy has a condition that checks the tag values, it will not be effective if the principal's identity-based policy has an explicit allow for the PutObject action without any conditions. The explicit allow in the identity-based policy will override the condition in the bucket policy and grant access to the principal.

The other options are incorrect because:

C) The S3 bucket's resource policy does not deny access to put objects. This is not a factor that causes the PutObject operation to succeed when the tag values are different. The bucket policy can either allow or deny access based on conditions, but it cannot prevent an explicit allow in the identity-based policy from taking effect.

D) The S3 bucket's resource policy cannot allow actions to the principal. This is not true. The bucket policy can allow actions to specific principals by using the Principal element in the policy statement. According to the AWS documentation2, ''The Principal element specifies the user (IAM user, federated user, or assumed-role user), AWS account, AWS service, or other principal entity that is allowed or denied access to a resource.''

E) The bucket policy does not apply to principals in the same zone of trust. This is not true. The bucket policy applies to any principal that is specified in the Principal element, regardless of whether they are in the same zone of trust or not. A zone of trust is a logical boundary that defines who can access a resource and under what conditions. According to the AWS documentation3, ''A zone of trust can be as small as a single resource (for example, an Amazon S3 object) or as large as an entire AWS account.''

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asked 16/09/2024
Mihai Stefanescu
35 questions
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