QUESTION: 81

A developer at a company uses an SSH key to access multiple Amazon EC2 instances. The company discovers that the SSH key has been posted on a public GitHub repository. A security engineer verifies that the key has not been used recently.

How should the security engineer prevent unauthorized access to the EC2 instances?

Delete the key pair from the EC2 console. Create a new key pair.
Use the ModifylnstanceAttribute API operation to change the key on any EC2 instance that is using the key.
Restrict SSH access in the security group to only known corporate IP addresses.
Update the key pair in any AMI that is used to launch the EC2 instances. Restart the EC2 instances.

Answer(s): C

Explanation:

To prevent unauthorized access to the EC2 instances, the security engineer should do the following:

Restrict SSH access in the security group to only known corporate IP addresses. This allows the security engineer to use a virtual firewall that controls inbound and outbound traffic for their EC2 instances, and limit SSH access to only trusted sources.

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QUESTION: 82

A company uses an external identity provider to allow federation into different IAM accounts. A security engineer for the company needs to identify the federated user that terminated a production Amazon EC2 instance a week ago.

What is the FASTEST way for the security engineer to identify the federated user?

Review the IAM CloudTrail event history logs in an Amazon S3 bucket and look for the Terminatelnstances event to identify the federated user from the role session name.
Filter the IAM CloudTrail event history for the Terminatelnstances event and identify the assumed IAM role. Review the AssumeRoleWithSAML event call in CloudTrail to identify the corresponding username.
Search the IAM CloudTrail logs for the Terminatelnstances event and note the event time. Review the IAM Access Advisor tab for all federated roles. The last accessed time should match the time when the instance was terminated.
Use Amazon Athena to run a SQL query on the IAM CloudTrail logs stored in an Amazon S3 bucket and filter on the Terminatelnstances event. Identify the corresponding role and run another query to filter the AssumeRoleWithWebldentity event for the user name.

Answer(s): B

Explanation:

The fastest way to identify the federated user who terminated a production Amazon EC2 instance is to filter the IAM CloudTrail event history for the TerminateInstances event and identify the assumed IAM role. Then, review the AssumeRoleWithSAML event call in CloudTrail to identify the corresponding username. This method does not require any additional tools or queries, and it directly links the IAM role with the federated user.

Option A is incorrect because the role session name may not be the same as the federated user name, and it may not be unique or descriptive enough to identify the user.

Option C is incorrect because the IAM Access Advisor tab only shows when a role was last accessed, not by whom or for what purpose. It also does not show the specific time of access, only the date.

Option D is incorrect because using Amazon Athena to run SQL queries on the IAM CloudTrail logs is not the fastest way to identify the federated user, as it requires creating a table schema and running multiple queries. It also assumes that the federation is done using web identity providers, not SAML providers, as indicated by the AssumeRoleWithWebIdentity event.

Reference:

AWS Identity and Access Management.

Logging AWS STS API Calls with AWS CloudTrail.

[Using Amazon Athena to Query S3 Data for CloudTrail Analysis]

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QUESTION: 83

An audit determined that a company's Amazon EC2 instance security group violated company policy by allowing unrestricted incoming SSH traffic. A security engineer must implement a near-real-time monitoring and alerting solution that will notify administrators of such violations.

Which solution meets these requirements with the MOST operational efficiency?

Create a recurring Amazon Inspector assessment run that runs every day and uses the Network Reachability package. Create an Amazon CloudWatch rule that invokes an IAM Lambda function when an assessment run starts. Configure the Lambda function to retrieve and evaluate the assessment run report when it completes. Configure the Lambda function also to publish an Amazon Simple Notification Service (Amazon SNS) notification if there are any violations for unrestricted incoming SSH traffic.
Use the restricted-ssh IAM Config managed rule that is invoked by security group configuration changes that are not compliant. Use the IAM Config remediation feature to publish a message to an Amazon Simple Notification Service (Amazon SNS) topic.
Configure VPC Flow Logs for the VP and specify an Amazon CloudWatch Logs group. Subscribe the CloudWatch Logs group to an IAM Lambda function that parses new log entries, detects successful connections on port 22, and publishes a notification through Amazon Simple Notification Service (Amazon SNS).
Create a recurring Amazon Inspector assessment run that runs every day and uses the Security Best Practices package. Create an Amazon CloudWatch rule that invokes an IAM Lambda function when an assessment run starts. Configure the Lambda function to retrieve and evaluate the assessment run report when it completes. Configure the Lambda function also to publish an Amazon Simple Notification Service (Amazon SNS) notification if there are any violations for unrestricted incoming SSH traffic.

Answer(s): B

Explanation:

The most operationally efficient solution to implement a near-real-time monitoring and alerting solution that will notify administrators of security group violations is to use the restricted-ssh AWS Config managed rule that is invoked by security group configuration changes that are not compliant. This rule checks whether security groups that are in use have inbound rules that allow unrestricted SSH traffic. If a violation is detected, AWS Config can use the remediation feature to publish a message to an Amazon Simple Notification Service (Amazon SNS) topic.

Option A is incorrect because creating a recurring Amazon Inspector assessment run that uses the Network Reachability package is not operationally efficient, as it requires setting up an assessment target and template, running the assessment every day, and invoking a Lambda function to retrieve and evaluate the assessment report. It also does not provide near-real-time monitoring and alerting, as it depends on the frequency and duration of the assessment run.

Option C is incorrect because configuring VPC Flow Logs for the VPC and specifying an Amazon CloudWatch Logs group is not operationally efficient, as it requires creating a log group and stream, enabling VPC Flow Logs for each subnet or network interface, and subscribing a Lambda function to parse and analyze the log entries. It also does not provide proactive monitoring and alerting, as it only detects successful connections on port 22 after they have occurred.

Option D is incorrect because creating a recurring Amazon Inspector assessment run that uses the Security Best Practices package is not operationally efficient, for the same reasons as option A. It also does not provide specific monitoring and alerting for security group violations, as it covers a broader range of security issues.

Reference:

[AWS Config Rules]

[AWS Config Remediation]

[Amazon Inspector]

[VPC Flow Logs]

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QUESTION: 84

A company manages multiple IAM accounts using IAM Organizations. The company's security team notices that some member accounts are not sending IAM CloudTrail logs to a centralized Amazon S3 logging bucket. The security team wants to ensure there is at least one trail configured (or all existing accounts and for any account that is created in the future.

Which set of actions should the security team implement to accomplish this?

Create a new trail and configure it to send CloudTrail logs to Amazon S3. Use Amazon EventBridge (Amazon CloudWatch Events) to send notification if a trail is deleted or stopped.
Deploy an IAM Lambda function in every account to check if there is an existing trail and create a new trail, if needed.
Edit the existing trail in the Organizations master account and apply it to the organization.
Create an SCP to deny the cloudtrail:Delete" and cloudtrail:Stop' actions. Apply the SCP to all accounts.

Answer(s): C

Explanation:

Users in member accounts will not have sufficient permissions to delete the organization trail, turn logging on or off, change what types of events are logged, or otherwise alter the organization trail in any way. https://docs.aws.amazon.com/awscloudtrail/latest/userguide/creating-trail- organization.html.

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QUESTION: 81

Explanation:

QUESTION: 82

Explanation:

Reference:

QUESTION: 83

Explanation:

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QUESTION: 84

Explanation: