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질문 # 92
A healthcare company stores more than 1 million patient records in an Amazon S3 bucket. The patient records include personally identifiable information (PII). The S3 bucket contains hundreds of terabytes of data.
A security engineer receives an alert that was triggered by an Amazon GuardDuty Exfiltration:S3/AnomalousBehavior finding. The security engineer confirms that an attacker is using temporary credentials that were obtained from a compromised Amazon EC2 instance that has s3:GetObject permissions for the S3 bucket. The attacker has begun downloading the contents of the bucket. The security engineer contacts a development team. The development team will require 4 hours to implement and deploy a fix.
The security engineer must take immediate action to prevent the attacker from downloading more data from the S3 bucket.
Which solution will meet this requirement?
정답：A
설명：
Amazon GuardDuty Exfiltration:S3/AnomalousBehavior findings indicate that S3 data access patterns are consistent with data exfiltration. In this scenario, the attacker is using temporary credentials obtained from an EC2 instance profile, which are issued by AWS Security Token Service (STS).
According to AWS Certified Security - Specialty documentation, the fastest and most targeted remediation is to revoke the temporary session credentials associated with the compromised instance profile. This can be accomplished by removing or modifying the IAM role permissions, detaching the instance profile, or stopping the instance, which immediately invalidates the temporary credentials and prevents further S3 access.
질문 # 93
A security engineer uses Amazon Macie to scan a company's Amazon S3 buckets for sensitive data. The company has many S3 buckets and many objects stored in the S3 buckets. The security engineer must identify S3 buckets that contain sensitive data and must perform additional scanning on those S3 buckets.
Which solution will meet these requirements with the LEAST administrative overhead?
정답：B
설명：
Amazon Macie'sautomated sensitive data discoveryis designed for exactly this: at scale, Macie continuously evaluates andsamplesobjects across S3 buckets to identify where sensitive data (PII, financial data, credentials, etc.) is likely present. This gives the security engineer a low-touch way toidentify which buckets contain sensitive datawithout having to orchestrate per-bucket scanning workflows. Once Macie flags buckets with sensitive data findings, the engineer can then prioritize and runadditional, more targeted scanning(for example, deeper classification jobs on those specific buckets) rather than scanning everything exhaustively all the time.
질문 # 94
A company stores sensitive data in an Amazon S3 bucket. The company encrypts the data at rest by using server-side encryption with Amazon S3 managed keys (SSE-S3). A security engineer must prevent any modifications to the data in the S3 bucket.
Which solution will meet this requirement?
정답：B
설명：
Amazon S3 Object Lock in compliance mode provides write-once-read-many (WORM) protection, which prevents objects from being modified or deleted for a specified retention period. According to the AWS Certified Security - Specialty Study Guide, compliance mode enforces immutability even for the root user and cannot be overridden.
Enabling S3 Object Lock requires S3 bucket versioning and ensures that once an object is written, it cannot be changed or removed until the retention period expires. This is the strongest protection against data modification and is commonly used for regulatory and legal retention requirements.
Option A can be bypassed by administrators. Option D only protects against deletions, not overwrites. Option C changes encryption but does not prevent modification.
AWS documentation explicitly identifies S3 Object Lock in compliance mode as the correct solution for immutable data storage.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
Amazon S3 Object Lock
Amazon S3 Data Protection and Compliance
질문 # 95
A company wants to establish separate AWS Key Management Service (AWS KMS) keys to use for different AWS services. The company's security engineer created a key policy to allow the infrastructure deployment team to create encrypted Amazon Elastic Block Store (Amazon EBS) volumes by assuming the InfrastructureDeployment IAM role. The security engineer recently discovered that IAM roles other than the InfrastructureDeployment role used this key for other services.
Which change to the policy should the security engineer make to resolve these issues?
정답：D
설명：
AWS KMS key policies can restrict how and where a key is used by leveraging condition keys such as kms:
ViaService. According to the AWS Certified Security - Specialty documentation, kms:ViaService limits key usage to requests that originate from a specific AWS service in a specific Region. If this condition is overly broad or incorrect, other IAM roles and services may unintentionally use the key.
By explicitly setting the kms:ViaService condition value to ec2.us-east-1.amazonaws.com, the key policy ensures that the KMS key can only be used when requests are made through the Amazon EC2 service in that Region, such as for EBS volume encryption. This prevents other services or unintended IAM roles from using the key.
Option A weakens the condition logic and can broaden access. Option B removes essential permissions that allow IAM policies to function with KMS keys and is not recommended. Option D relates to administrative control of the key, not service-level usage restrictions.
AWS best practices recommend using kms:ViaService and precise condition values to enforce service- specific key usage and strong separation of duties.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS KMS Key Policy Condition Keys
AWS KMS Best Practices
질문 # 96
A development team is creating an open source toolset to manage a company's software as a service (SaaS) application. The company stores the code in a public repository so that anyone can view and download the toolset's code. The company discovers that the code contains an IAM access key and secret key that provide access to internal resources in the company ' s AWS environment. A security engineer must implement a solution to identify whether unauthorized usage of the exposed credentials has occurred. The solution also must prevent any additional usage of the exposed credentials.
Which combination of steps will meet these requirements? (Select TWO.)
정답：B,C
설명：
The immediate containment step for exposed access keys is todisable (deactivate) the compromised IAM access key(Option B). This prevents any further use of the leaked credentials, which is essential once secrets are publicly exposed. Creating a new key (Option D) may be part of recovery later, but it does not stop abuse of the already exposed key unless the exposed key is first deactivated.
To determine whether the credentials were used, you need evidence of access activity. Among the provided options, the best fit is generating and reviewing theIAM credential report(Option E). The report includes metadata such as access key status and "last used" style details that help triage whether the user's credentials have been exercised recently. While deeper investigation would typically rely on CloudTrail "AccessKeyId" searches, the credential report is a quick AWS-native step aligned to the answer choices.
Option A is not correct: IAM Access Analyzer helps identify external access paths to resources and validate policies; it does not provide a definitive history of what a specific access key did. Option C is not a GuardDuty capability-GuardDuty generates findings; it does not "block" a specific access key. Therefore, deactivating the key and using credential reporting to assess recent usage best matches the requirements.
질문 # 97
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