Pass the Amazon Web Services AWS Certified Specialty SCS-C03 Questions and answers with Dumpstech

AWS Config requires permissions at two levels to deliver configuration data: the AWS Config service role and the S3 bucket policy. The AWS Certified Security – Specialty Study Guide states that the S3 bucket policy must explicitly allow the config.amazonaws.com service principal to write objects. Additionally, the IAM role used by AWS Config must allow s3:GetBucketAcl and s3:PutObject.

If either permission is missing, AWS Config cannot deliver snapshots and will log delivery errors in CloudTrail. This dual-permission model ensures least privilege while maintaining secure delivery of compliance data.

Other options reference incorrect principals or irrelevant permissions.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS Config Prerequisites

AWS best practices require CloudFormation to assume a dedicated service role. This ensures consistent permissions regardless of the user. Users must have iam:PassRole permission to pass the role. Updating stacks to use the service role enforces uniform deployment behavior.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS CloudFormation Service Roles

Amazon GuardDuty provides fully managed threat detection across accounts when configured with delegated administration. EKS and RDS protections enable workload-aware detection with minimal setup.

Other solutions require custom pipelines and higher operational overhead.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

Amazon GuardDuty Multi-Account Architecture

AWS CloudTrail provides a record of all API calls made in an AWS account, including calls initiated by AWS CloudFormation. According to the AWS Certified Security – Specialty Study Guide, CloudTrail is the primary source for troubleshooting authorization failures because it records denied actions and the policy type that caused the denial, including service control policies.

Reviewing CloudTrail logs allows a security engineer to identify which specific API calls failed during the CloudFormation deployment and whether the denial was caused by an SCP, an IAM policy, or a permission boundary. This evidence-based approach is the recommended first step before making any configuration changes.

Option B is unsafe and violates governance best practices by removing SCPs in production. Option C may be necessary later, but it does not identify whether SCPs are the root cause. Option D introduces unnecessary risk and bypasses the purpose of differentiated controls across OUs.

AWS documentation emphasizes observing and validating before modifying security controls, making CloudTrail log analysis the correct initial troubleshooting step.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS Organizations Service Control Policies

AWS CloudTrail Authorization Failure Analysis

AWS best practices strongly discourage the use of long-term credentials and recommend cross-account IAM roles with temporary credentials for third-party access. According to the AWS Certified Security – Specialty Study Guide, creating an IAM role in the resource-owning account and allowing a trusted external AWS account to assume that role is the recommended pattern for external access.

By creating the IAM role in the company’s production account and specifying the consultant agency’s AWS account as the trusted principal, the company retains full control over permissions. The trust policy can enforce MFA by using the aws:MultiFactorAuthPresent condition key, ensuring that all access requires MFA. Access is granted through AWS Security Token Service (STS), which issues short-lived credentials.

Option A violates the requirement to avoid long-term credentials. Option B is designed for application user authentication, not AWS account access. Option C incorrectly places the role in the consultant’s account, reducing the company’s control over access.

This solution satisfies MFA enforcement, eliminates long-term credentials, and aligns with AWS third-party access best practices.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS IAM Cross-Account Access

AWS STS and MFA Enforcement

AWS Systems Manager Run Command enables secure, remote execution of commands on EC2 instances without requiring network access or inbound ports. According to the AWS Certified Security – Specialty Study Guide, Run Command is a recommended mechanism for incident response actions such as installing forensic tools, collecting evidence, or applying quarantine controls.

By granting the SSM Agent permission to execute a predefined Run Command document, the security engineer can immediately run the quarantine script across affected instances. This approach supports automation, scalability, and auditability, all of which are critical during security incidents.

Options A, B, and C do not directly enforce quarantine or execute response actions. Tracking versions and storing scripts alone do not trigger incident response.

AWS documentation highlights Systems Manager Run Command as a core capability for automated containment and investigation.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS Systems Manager Run Command

AWS Incident Response Automation

AWS IAM Identity Center centrally manages user access across an AWS Organization. Disabling the user in Identity Center immediately revokes access to all AWS accounts. According to AWS Certified Security – Specialty documentation, organizational CloudTrail event data stores provide centralized, queryable access to all events across accounts.

Using CloudTrail Lake enables direct querying of activity without exporting logs. Disabling the user at the Identity Center level ensures full containment.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS IAM Identity Center Incident Response

AWS CloudTrail Lake

Amazon Macie is the AWS service designed to discover and classify sensitive data in S3. Delegated administration enables centralized visibility across an organization. Security Hub aggregates Macie findings for a single-pane-of-glass view.

Inspector does not scan S3 data. Trusted Advisor is not a sensitive data discovery tool.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

Amazon Macie Multi-Account Architecture

AWS Organizations service control policies (SCPs) are designed to enforce preventive guardrails across accounts without requiring application-level changes. According to the AWS Certified Security – Specialty documentation, SCPs can restrict specific API actions or require certain condition keys to enforce security standards centrally. AWS Lambda function URLs support two authentication modes: AWS_IAM and NONE. When the authentication type is set to NONE, the function URL becomes publicly accessible, which introduces a significant security risk in production environments.

By using an SCP that explicitly denies the lambda:CreateFunctionUrlConfig and lambda:UpdateFunctionUrlConfig actions when the lambda:FunctionUrlAuthType condition key equals NONE, the organization ensures that unauthenticated function URLs cannot be created or modified in production accounts. This enforcement occurs at the AWS Organizations level and applies automatically to all accounts within the specified organizational units (OUs). Developers are not required to change their workflows or add additional controls, satisfying the requirement of no additional developer effort.

Option A relates to browser-based access controls and does not provide authentication or authorization enforcement. Option B is not valid because AWS WAF cannot be attached directly to AWS Lambda function URLs. Option C is incorrect because SCPs do not grant permissions; they only limit permissions. AWS documentation clearly states that SCPs define maximum available permissions and are evaluated before IAM policies.

This approach aligns with AWS best practices for centralized governance, least privilege, and preventive security controls.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS Organizations Service Control Policies Documentation

AWS Lambda Security and Function URL Authentication Overview

Amazon S3 Block Public Access provides centralized controls to prevent public access through bucket policies and ACLs. AWS Certified Security – Specialty guidance recommends enabling Block Public Access to reduce accidental exposure and to enforce guardrails that override public grants. Enabling Block Public Access on the bucket removes current public exposure when combined with correcting policies/ACLs and prevents future misconfiguration. To ensure the bucket cannot be made public again, the security engineer must prevent principals from disabling Block Public Access. An SCP that denies s3:PutPublicAccessBlock prevents changes that would remove or weaken the PublicAccessBlock configuration, enforcing the guardrail across the OU or account. Options A and D do not directly address public exposure control. Option B denies object reads but does not ensure public access cannot be re-enabled; it also does not address the root misconfiguration pathways and could disrupt legitimate access patterns. Option C specifically combines the correct preventive control (PublicAccessBlock) with organizational enforcement to stop future reversal.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

Amazon S3 Block Public Access

AWS Organizations SCP Guardrails for S3 Controls