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Question 21.

A development team is defining security requirements for a new payment application. Which source should have the GREATEST influence on those requirements?

1. Developer preference
2. Business risk, data sensitivity, regulatory obligations, and threat exposure
3. The color scheme of the user interface
4. The number of servers available

Correct Answer: 2. Business risk, data sensitivity, regulatory obligations, and threat exposure

Explanation:

Security requirements should be derived from the risks and obligations associated with the system. Business objectives, sensitive assets, regulatory requirements, expected threat exposure, and acceptable risk determine what security capabilities are necessary. Technology choices should follow these requirements rather than define them. Developer preferences and infrastructure details may influence implementation, but they should not replace a structured requirements process tied to organizational risk.

Question 22.

Which secure software practice BEST helps prevent integer overflow vulnerabilities?

1. Validate numeric ranges and use appropriate data types before arithmetic operations
2. Increase database storage
3. Disable application logging
4. Use longer variable names

Correct Answer: 1. Validate numeric ranges and use appropriate data types before arithmetic operations

Explanation:

Integer overflow can occur when calculations exceed the supported range of a numeric type, potentially causing unexpected logic, memory allocation, or security behavior. Developers should validate input ranges, select data types appropriate to expected values, and use safe arithmetic mechanisms where available. These controls are particularly important when numeric values influence memory sizes, array indexes, financial calculations, or authorization decisions.

Question 23.

A software architect wants to identify trust boundaries before coding begins. Which artifact is MOST useful?

1. Marketing plan
2. User training schedule
3. Data-flow diagram showing components, data movement, and external entities
4. Hardware warranty documentation

Correct Answer: 3. Data-flow diagram showing components, data movement, and external entities

Explanation:

Data-flow diagrams help teams understand how information moves between users, processes, data stores, and external systems. They make trust boundaries visible and support threat modeling by showing where data crosses between different security contexts. These diagrams can reveal where authentication, validation, encryption, authorization, or monitoring controls may be required before implementation begins.

Question 24.

A software team discovers that an application fails open when its authorization service is unavailable. What is the BEST correction for sensitive operations?

1. Grant access to all authenticated users
2. Allow internal users to bypass authorization
3. Disable authentication during outages
4. Deny sensitive operations unless authorization can be verified

Correct Answer: 4. Deny sensitive operations unless authorization can be verified

Explanation:

Sensitive functions should normally fail securely when authorization cannot be established. Allowing access because a policy service is unavailable can turn an operational failure into a security bypass. Lower-risk operations may support carefully designed cached authorization, but this behavior must be explicit and bounded. The safest default for sensitive operations is to deny or defer access until authorization can be reliably confirmed.

Question 25.

Why should security acceptance criteria be defined for user stories or software requirements?

1. They make security expectations testable and verifiable
2. They eliminate the need for code review
3. They guarantee that vulnerabilities cannot occur
4. They replace functional acceptance criteria

Correct Answer: 1. They make security expectations testable and verifiable

Explanation:

Security acceptance criteria translate abstract security requirements into specific conditions that can be tested. For example, a story involving account recovery might require strong identity verification, secure token handling, expiration, and audit logging. Clear criteria help developers, testers, and product owners determine whether security requirements were implemented correctly. They complement rather than replace functional requirements and broader security testing.

Question 26.

A web application constructs operating-system commands using user input. Which control BEST reduces command-injection risk?

1. Increase server memory
2. Avoid shell invocation where possible and use safe APIs with strict input validation
3. Disable TLS
4. Give the application administrator privileges

Correct Answer: 2. Avoid shell invocation where possible and use safe APIs with strict input validation

Explanation:

Command injection occurs when untrusted input is interpreted as part of an operating-system command. The strongest approach is to avoid constructing shell commands when safer APIs can perform the required function directly. If command execution is unavoidable, strict allowlist validation, fixed arguments, least privilege, and appropriate encoding or parameter handling should be used. Broad privileges make the impact of injection significantly worse.

Question 27.

What is the MAIN benefit of performing static application security testing during development?

1. It measures production network latency
2. It replaces all code review
3. It can identify certain implementation weaknesses without executing the application
4. It guarantees that software is vulnerability-free

Correct Answer: 3. It can identify certain implementation weaknesses without executing the application

Explanation:

Static application security testing analyzes source code, bytecode, or binaries without running the application. It can identify patterns associated with insecure data handling, injection risks, dangerous APIs, and other coding weaknesses. Static analysis is most effective when integrated early into development and combined with manual review and dynamic testing. No single testing technique finds every type of vulnerability.

Question 28.

A development organization wants to ensure that emergency production fixes do not bypass security governance. Which approach is BEST?

1. Allow developers to make undocumented production changes
2. Disable logging during emergencies
3. Use shared administrator credentials for faster access
4. Define an expedited but authorized, logged, and retrospectively reviewed emergency-change process

Correct Answer: 4. Define an expedited but authorized, logged, and retrospectively reviewed emergency-change process

Explanation:

Emergencies may require faster changes, but they should not eliminate accountability. A secure emergency-change process can streamline approval while retaining authorization, individual identity, logging, testing where practical, and post-implementation review. This balances operational urgency with change control. Untracked emergency changes can introduce vulnerabilities, configuration drift, and uncertainty about what actually changed.

Question 29.

Which coding practice BEST reduces the risk of exposing sensitive information through application logs?

1. Define logging rules that exclude or mask credentials, tokens, and unnecessary sensitive data
2. Log every request body and password
3. Disable all security logging
4. Store logs in publicly accessible locations

Correct Answer: 1. Define logging rules that exclude or mask credentials, tokens, and unnecessary sensitive data

Explanation:

Logs are valuable for monitoring and incident response, but they can create additional exposure if they contain passwords, access tokens, payment data, or other sensitive information. Developers should define what may be logged, mask or exclude sensitive values, and protect log storage with appropriate access controls and retention. Completely disabling logs would reduce detection and forensic capabilities.

Question 30.

A software team wants to manage cryptographic keys used by its application securely. Which approach is MOST appropriate?

1. Store keys in source-code repositories
2. Use an approved key-management service with access control, rotation, and audit capabilities
3. Embed keys in container images
4. Send keys through email to developers

Correct Answer: 2. Use an approved key-management service with access control, rotation, and audit capabilities

Explanation:

Cryptographic keys require lifecycle protection including secure generation, storage, access control, rotation, revocation, backup where necessary, and destruction. An approved key-management service can centralize these controls and provide auditing. Keys embedded in code or images are difficult to protect and rotate and may leak through repositories or build artifacts. Applications should retrieve key services through controlled identities and permissions.

Question 31.

A security review finds that a user can change a URL parameter and access another user’s record. What type of weakness is MOST likely present?

1. Buffer overflow
2. Cryptographic downgrade
3. Broken object-level authorization
4. Denial of service

Correct Answer: 3. Broken object-level authorization

Explanation:

Changing an identifier to retrieve another user’s data indicates that the application may authenticate the requester but fail to verify authorization for the requested object. Server-side authorization should confirm that the current user is permitted to access each specific record or resource. Predictable identifiers are not themselves the core issue; the failure is insufficient authorization enforcement.

Question 32.

Which practice BEST protects the integrity of software releases distributed to customers?

1. Rename release files before publication
2. Compress releases using a common archive format
3. Publish releases from a developer workstation
4. Digitally sign releases and protect the signing process and private keys

Correct Answer: 4. Digitally sign releases and protect the signing process and private keys

Explanation:

Digital signatures allow customers or deployment systems to verify that software originated from an authorized publisher and has not been modified after signing. The signing environment and private keys are therefore highly sensitive assets. They should be protected through strong access controls, dedicated signing mechanisms, audit logging, and revocation procedures. A compromised signing key can make malicious software appear legitimate.

Question 33.

What is the MAIN purpose of a software security architecture review?

1. Identify security weaknesses and risky design decisions before they become expensive to change
2. Replace all penetration testing
3. Measure developer productivity
4. Approve user-interface designs

Correct Answer: 1. Identify security weaknesses and risky design decisions before they become expensive to change

Explanation:

Architecture reviews assess trust boundaries, data flows, authentication, authorization, cryptography, error handling, external dependencies, and other design-level security concerns. Finding weaknesses before implementation reduces remediation cost and prevents insecure patterns from spreading through the codebase. Architecture review complements secure coding, testing, and operational monitoring rather than replacing them.

Question 34.

A development team needs to process uploaded files from untrusted users. Which approach is BEST?

1. Execute uploaded files immediately
2. Validate file type and content, limit size, store safely, and process in a restricted environment
3. Trust the file extension supplied by the user
4. Give the upload-processing service administrator privileges

Correct Answer: 2. Validate file type and content, limit size, store safely, and process in a restricted environment

Explanation:

File uploads can contain malicious content, oversized payloads, unexpected file formats, or executable code. Secure handling should validate actual content rather than relying only on file extensions, enforce size limits, use safe storage locations and generated filenames, and process files with minimal privileges in an isolated environment when appropriate. Additional malware scanning may also be justified depending on risk.

Question 35.

Why should secure software teams monitor third-party dependencies continuously after release?

1. Dependencies cannot become vulnerable after deployment
2. Monitoring eliminates the need for updates
3. New vulnerabilities may be discovered in components that were considered acceptable at release time
4. Third-party libraries never change

Correct Answer: 3. New vulnerabilities may be discovered in components that were considered acceptable at release time

Explanation:

A software component may have no known vulnerabilities when an application is released but later be found to contain serious flaws. Continuous dependency monitoring helps identify newly disclosed vulnerabilities and determine which applications are affected. This supports timely patching, mitigation, or component replacement. Secure software lifecycle responsibilities continue after deployment and throughout maintenance.

Question 36.

A software product is being retired. Which activity is MOST important from a security perspective?

1. Keep all service accounts active indefinitely
2. Preserve every production endpoint permanently
3. Disable monitoring before shutdown
4. Revoke credentials, remove access paths, handle retained data, and communicate end-of-support

Correct Answer: 4. Revoke credentials, remove access paths, handle retained data, and communicate end-of-support

Explanation:

Secure retirement includes more than turning off an application. Credentials, certificates, API keys, integrations, network rules, data stores, backups, and dependencies should be reviewed and removed or retained according to policy. Customers and operational teams may also need clear end-of-support information. Leaving unused identities or interfaces active can create forgotten attack paths after the software is supposedly retired.

Question 37.

Which technique BEST helps ensure that an application performs authorization consistently across all protected functions?

1. Centralize reusable authorization logic or policy enforcement rather than duplicating ad hoc checks
2. Hide unauthorized menu options only
3. Trust all authenticated users equally
4. Perform authorization only in client-side code

Correct Answer: 1. Centralize reusable authorization logic or policy enforcement rather than duplicating ad hoc checks

Explanation:

Scattered authorization logic can become inconsistent as software evolves. Reusable server-side policy enforcement helps ensure that protected operations apply the same rules and reduces the risk that developers forget checks in individual endpoints. Centralization must still be designed for resilience and appropriate context, but it improves maintainability and consistency. Client-side controls should never be the sole authorization mechanism.

Question 38.

A software team is considering whether to build a custom cryptographic algorithm. What is the BEST guidance?

1. Custom cryptography is preferable because attackers do not know it
2. Use well-vetted standard cryptographic algorithms and libraries unless there is an exceptional justified need
3. Avoid all encryption to reduce complexity
4. Store encryption keys with ciphertext for convenience

Correct Answer: 2. Use well-vetted standard cryptographic algorithms and libraries unless there is an exceptional justified need

Explanation:

Designing secure cryptographic algorithms and implementations is extremely difficult. Established standards and mature libraries have received substantially more analysis and testing than most custom designs. Developers should use approved algorithms, modes, key sizes, and libraries appropriate to the organization’s requirements. Security should not depend on keeping an algorithm secret, and custom cryptography should be avoided without compelling expertise and justification.

Question 39.

A security test reveals that session identifiers remain valid after a user logs out. What should be corrected?

1. Increase session duration
2. Store session identifiers in URLs
3. Invalidate the server-side session or token when logout occurs
4. Disable authentication logging

Correct Answer: 3. Invalidate the server-side session or token when logout occurs

Explanation:

Logout should terminate the authenticated session so a captured or previously issued session identifier cannot continue to authorize requests. Depending on the architecture, this may involve deleting server-side session state, revoking tokens, rotating identifiers, or using appropriately short token lifetimes. Merely removing a client-side cookie without invalidating the underlying session may leave the credential usable.

Question 40.

Which practice BEST represents a mature CSSLP-oriented software security program?

1. Address security only during final testing
2. Depend solely on penetration testing
3. Make developers responsible for security without governance or support
4. Integrate security governance, requirements, design, implementation, testing, deployment, maintenance, and retirement

Correct Answer: 4. Integrate security governance, requirements, design, implementation, testing, deployment, maintenance, and retirement

Explanation:

Mature software security spans the complete lifecycle. Governance establishes expectations, requirements define objectives, secure design reduces architectural weaknesses, coding practices address implementation risk, testing verifies controls, deployment protects release integrity, maintenance handles newly discovered issues, and retirement removes obsolete exposure. Security is therefore a continuous shared responsibility supported by defined processes, tools, training, and accountability.