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Question 281.

A development team is defining security requirements for a new application that stores sensitive customer records. Which requirement is MOST appropriate?

1. The application should use strong security
2. Access to sensitive records must be limited to authenticated and authorized users based on business need
3. Developers should try to avoid vulnerabilities
4. Users should be responsible for protecting all application data

Correct Answer: 2. Access to sensitive records must be limited to authenticated and authorized users based on business need

Explanation:

Security requirements should be specific, measurable, and tied to business risk. Requiring authentication and authorization for sensitive records defines clear expected behavior that can be implemented and tested. Vague requirements such as “use strong security” do not provide sufficient guidance to developers or testers. Requirements should also consider confidentiality, integrity, availability, privacy, regulatory obligations, and expected threats.

Question 282.

Which secure coding technique BEST reduces the risk of command injection when an application must invoke an operating-system utility?

1. Use a safe API with fixed commands and validated arguments instead of constructing shell commands from untrusted input
2. Give the application administrator privileges
3. Disable command logging
4. Accept all user-supplied command-line options

Correct Answer: 1. Use a safe API with fixed commands and validated arguments instead of constructing shell commands from untrusted input

Explanation:

Command injection occurs when untrusted data alters the meaning of an operating-system command. The safest design is to avoid shell interpretation whenever possible and use APIs that pass arguments separately. Strict allowlist validation and least privilege provide additional protection. Concatenating user input into shell commands is dangerous because metacharacters may cause unintended commands to execute.

Question 283.

A security architect wants to identify where sensitive information enters, moves through, and leaves a system. Which technique is MOST useful?

1. Source-code style review
2. Performance testing
3. Data-flow modeling
4. Capacity planning

Correct Answer: 3. Data-flow modeling

Explanation:

Data-flow models illustrate how information moves between users, processes, data stores, and external systems. They help identify trust boundaries, entry points, sensitive data paths, and places where encryption, validation, authorization, or minimization may be required. Data-flow analysis is especially useful during threat modeling and architecture review because it exposes interactions that may not be obvious from component descriptions alone.

Question 284.

An application detects that a downloaded software component fails its expected integrity check. What should happen?

1. Install the component if it came from a familiar website
2. Retry installation without verification
3. Allow users to choose whether to trust it
4. Reject the component and investigate the integrity failure

Correct Answer: 4. Reject the component and investigate the integrity failure

Explanation:

A failed integrity check may indicate corruption, tampering, or an unexpected component version. Installing the component would undermine supply-chain security and could introduce malicious code. The application should reject it, record the failure, and obtain a trusted copy from an approved source. Integrity verification should be combined with provenance and publisher-authentication controls where practical.

Question 285.

Which security principle is MOST directly applied when an application component is given only read access because it does not need to modify data?

1. Least privilege
2. Open design
3. Defense in depth
4. Economy of mechanism

Correct Answer: 1. Least privilege

Explanation:

Least privilege requires granting only the permissions necessary for the component’s legitimate function. If a service only needs to read data, write or administrative permissions should not be assigned. Limiting privileges reduces the potential impact of a compromised component or credential. Permissions should also be reviewed periodically because software responsibilities and access needs can change over time.

Question 286.

A software team is designing an account-lockout mechanism. Which approach is MOST appropriate?

1. Permanently lock every account after one failed attempt
2. Use risk-based throttling, delays, monitoring, or carefully designed lockout controls
3. Allow unlimited authentication attempts
4. Disable authentication logging

Correct Answer: 2. Use risk-based throttling, delays, monitoring, or carefully designed lockout controls

Explanation:

Account-protection mechanisms should slow automated guessing without creating an easy denial-of-service attack against legitimate users. Rate limiting, progressive delays, temporary lockouts, suspicious-activity detection, and multifactor authentication can be combined based on risk. Permanent lockout after a single failure is generally impractical, while unlimited attempts make brute-force attacks easier.

Question 287.

A software review discovers that a privileged API endpoint relies on a role value contained in a browser request. What should be done?

1. Encrypt the role value in JavaScript
2. Rename the role field
3. Determine authorization using trusted server-side identity and policy information
4. Hide the endpoint from the user interface

Correct Answer: 3. Determine authorization using trusted server-side identity and policy information

Explanation:

Values sent by the browser are under user control and can be modified. The server should determine the authenticated identity and obtain roles or privileges from trusted server-side sources before authorizing a protected operation. Client-side fields may support display logic, but they should never be the authoritative basis for access-control decisions.

Question 288.

A release pipeline uses the same privileged credential for source control, artifact storage, and production deployment. What is the BEST improvement?

1. Share the credential with more developers
2. Disable credential auditing
3. Store the credential directly in pipeline code
4. Use separate, narrowly scoped identities for each pipeline function

Correct Answer: 4. Use separate, narrowly scoped identities for each pipeline function

Explanation:

Using one highly privileged credential across multiple systems creates a large blast radius if that credential is compromised. Separate identities allow permissions to be tailored to each pipeline stage and make monitoring, revocation, and investigation easier. Short-lived credentials or workload identities should be preferred where available. This approach supports least privilege and separation of responsibilities.

Question 289.

What is the PRIMARY purpose of security acceptance criteria in software development?

1. Define testable conditions that demonstrate a security requirement has been satisfied
2. Replace all functional requirements
3. Eliminate the need for penetration testing
4. Guarantee that software has no vulnerabilities

Correct Answer: 1. Define testable conditions that demonstrate a security requirement has been satisfied

Explanation:

Security acceptance criteria translate high-level security requirements into observable conditions. For example, an authorization requirement may specify that unauthorized users receive access denial for particular operations. Clear criteria help developers, testers, and product owners determine whether security expectations have been met. They complement other forms of review and testing rather than replacing them.

Question 290.

A software application encrypts sensitive data but stores the encryption key next to the encrypted database using the same access permissions. What is the MAIN concern?

1. Encryption will slow the database
2. Compromise of the storage location may expose both the ciphertext and the key
3. Database indexes may become larger
4. Encryption automatically provides integrity

Correct Answer: 2. Compromise of the storage location may expose both the ciphertext and the key

Explanation:

Encryption is much less effective if attackers who obtain the encrypted data can also obtain the decryption key from the same location. Keys should be protected separately using dedicated key-management mechanisms, stronger access controls, or hardware-backed protection when justified. Key lifecycle management should also include generation, rotation, revocation, backup, and destruction.

Question 291.

A security test finds that an application returns sensitive information in HTTP error responses. Which remediation is BEST?

1. Include additional debugging information
2. Disable all server logging
3. Return generic user-facing errors while recording detailed information in protected logs
4. Send application secrets to users for troubleshooting

Correct Answer: 3. Return generic user-facing errors while recording detailed information in protected logs

Explanation:

User-facing error responses should provide only the information necessary to explain that the operation failed. Internal stack traces, paths, database queries, secrets, or configuration details can help attackers understand the system. Detailed diagnostics should instead be stored securely for authorized troubleshooting. Logging rules should also prevent passwords, tokens, and other unnecessary sensitive values from being recorded.

Question 292.

An organization discovers that a third-party component used in production is no longer supported by its supplier. What is the BEST action?

1. Continue using it permanently because no vulnerability is currently known
2. Remove it from the component inventory
3. Disable security monitoring for the component
4. Assess the risk and plan migration or replacement with a supported alternative

Correct Answer: 4. Assess the risk and plan migration or replacement with a supported alternative

Explanation:

Unsupported components may stop receiving security patches even when serious vulnerabilities are later discovered. The organization should assess exposure, determine whether temporary mitigations are needed, and plan migration to a supported component. Dependency inventories and support-status monitoring help teams identify these lifecycle risks before they become emergencies.

Question 293.

Which practice BEST improves the security of software configuration management?

1. Maintain approved baselines and review, authorize, and track security-relevant configuration changes
2. Allow all users to edit production configuration
3. Disable configuration history
4. Keep production settings undocumented

Correct Answer: 1. Maintain approved baselines and review, authorize, and track security-relevant configuration changes

Explanation:

Configuration can affect authentication, authorization, encryption, logging, and network exposure just as significantly as source code. Approved baselines provide a known secure state, while change control and version history make modifications traceable. Automated configuration validation can help detect drift. Production configuration should therefore receive security governance comparable to other high-risk software assets.

Question 294.

A software team needs to verify that data sent between two services has not been modified and came from an expected source. Which mechanism is MOST appropriate?

1. Data compression
2. A cryptographic message authentication mechanism
3. A larger network packet size
4. Plaintext logging

Correct Answer: 2. A cryptographic message authentication mechanism

Explanation:

A message authentication code or properly used digital signature can provide integrity and origin authentication. The appropriate mechanism depends on whether the parties share a secret or require asymmetric verification. Confidentiality may require encryption in addition to integrity protection. Key management and replay protection should also be considered when designing secure service-to-service communication.

Question 295.

A development team wants to discover security defects caused by unusual boundary values and malformed data. Which testing technique is MOST appropriate?

1. User-interface usability testing
2. Capacity planning
3. Fuzz testing
4. License review

Correct Answer: 3. Fuzz testing

Explanation:

Fuzz testing supplies unexpected, malformed, random, or boundary-case inputs to software to identify crashes, parsing errors, validation weaknesses, memory problems, and other defects. It is particularly effective for file parsers, protocol handlers, APIs, and complex input-processing code. Fuzzing should complement static analysis, code review, unit testing, and penetration testing.

Question 296.

A production system allows rollback to an older release that contains a known authentication vulnerability. Which control is MOST appropriate?

1. Permit unlimited downgrades because the old release was once valid
2. Disable version tracking
3. Remove digital signatures
4. Enforce secure rollback policy that blocks unauthorized installation of vulnerable versions

Correct Answer: 4. Enforce secure rollback policy that blocks unauthorized installation of vulnerable versions

Explanation:

A validly signed older release can still contain known vulnerabilities. Secure update mechanisms should therefore consider both authenticity and version policy. Rollback may sometimes be necessary for recovery, but it should be explicitly authorized and controlled. Attackers should not be able to downgrade software to a weaker release as a way to bypass current security protections.

Question 297.

Which activity BEST helps an organization identify whether secure coding training is reducing recurring vulnerabilities?

1. Compare vulnerability trends and defect categories over time
2. Count only the number of developers attending training
3. Stop collecting defect information
4. Measure application color consistency

Correct Answer: 1. Compare vulnerability trends and defect categories over time

Explanation:

Training effectiveness is better measured through outcomes than attendance alone. If recurring vulnerability categories decrease after targeted training, coding standards, and tooling improvements, that provides evidence of progress. Metrics should be interpreted carefully because changes in testing depth or reporting can affect defect counts. The goal is continuous improvement rather than simply producing a favorable number.

Question 298.

A software team wants to secure privileged administrative operations performed through an API. Which approach is BEST?

1. Rely on a secret URL
2. Require strong authentication, server-side authorization, and detailed protected audit logging
3. Allow access from any internal IP address without identity verification
4. Disable logging to protect administrator privacy

Correct Answer: 2. Require strong authentication, server-side authorization, and detailed protected audit logging

Explanation:

Administrative APIs can alter users, permissions, data, or system configuration and therefore require stronger controls. Administrators should have unique identities, appropriate authentication, least-privileged authorization, and actions should be logged for accountability. Network location or obscure URLs do not replace identity and access controls. High-risk operations may also require step-up authentication or independent approval.

Question 299.

A development organization discovers that security defects are repeatedly introduced in the same software module. What is the BEST response?

1. Accept the defects because the module is complex
2. Stop testing the module
3. Perform root-cause analysis and improve the design, standards, training, or controls responsible for the pattern
4. Hide the defect history from developers

Correct Answer: 3. Perform root-cause analysis and improve the design, standards, training, or controls responsible for the pattern

Explanation:

Repeated defects often indicate a systemic issue rather than isolated mistakes. Root-cause analysis may reveal overly complex architecture, unsafe APIs, inadequate standards, missing automated tests, or gaps in developer knowledge. Correcting the underlying cause can prevent future vulnerabilities more effectively than repeatedly fixing individual symptoms. The lessons should feed back into secure lifecycle improvement.

Question 300.

Which practice BEST represents mature software security assurance throughout the product lifecycle?

1. Perform a security test only immediately before release
2. Depend entirely on developer experience
3. Treat production monitoring as unrelated to software security
4. Combine requirements, threat modeling, secure design, implementation controls, verification, secure release, monitoring, maintenance, and retirement

Correct Answer: 4. Combine requirements, threat modeling, secure design, implementation controls, verification, secure release, monitoring, maintenance, and retirement

Explanation:

Mature software assurance uses multiple complementary security activities throughout the lifecycle. Requirements establish objectives, threat modeling identifies risks, secure architecture and coding reduce weaknesses, verification provides evidence, and controlled release protects production integrity. After deployment, monitoring, vulnerability management, incident learning, dependency management, and secure retirement maintain assurance as conditions change. No single activity can provide complete security.