View Full ISC CSSLP Exam Dumps and Practice Test Dumps

 

Question 1.

During the software development lifecycle, when should security requirements ideally be identified?

1. During requirements and planning activities
2. After production deployment
3. Only during penetration testing
4. After the first security incident

Correct Answer: 1. During requirements and planning activities

Explanation:

Security requirements should be identified as early as possible because they influence architecture, design, implementation, testing, and deployment decisions. Addressing security only after development is substantially complete can make remediation more expensive and disruptive. Early requirements should reflect business objectives, data sensitivity, regulatory obligations, threat exposure, and risk tolerance. Later testing remains important, but it validates the implementation rather than replacing security requirements analysis.

Question 2.

What is the PRIMARY purpose of threat modeling during secure software development?

1. To select programming languages
2. To identify potential threats, attack paths, and required mitigations
3. To eliminate the need for testing
4. To measure application performance

Correct Answer: 2. To identify potential threats, attack paths, and required mitigations

Explanation:

Threat modeling helps development and security teams understand how attackers may misuse a system, which assets are valuable, where trust boundaries exist, and what controls are needed. Performing this analysis during design allows security weaknesses to be corrected before they become deeply embedded in the implementation. Threat modeling complements code review, security testing, and monitoring rather than replacing them.

Question 3.

Which secure coding practice BEST helps prevent SQL injection vulnerabilities?

1. Increasing database server memory
2. Disabling application logging
3. Using parameterized queries or prepared statements
4. Allowing direct database access to users

Correct Answer: 3. Using parameterized queries or prepared statements

Explanation:

Parameterized queries separate executable SQL syntax from user-supplied data. This reduces the likelihood that malicious input will be interpreted as part of a database command. Input validation and least-privilege database permissions provide additional protection, but parameterized queries are a primary coding defense against SQL injection. String concatenation of untrusted input should generally be avoided when constructing database queries.

Question 4.

A development team discovers a serious security flaw shortly before release. What should happen FIRST?

1. Ignore the flaw if the release date is fixed
2. Release the software and document the issue later
3. Hide the flaw from stakeholders
4. Assess the risk and determine whether release criteria can still be met

Correct Answer: 4. Assess the risk and determine whether release criteria can still be met

Explanation:

A security flaw should be evaluated based on severity, exploitability, affected assets, business impact, and release requirements. The organization can then determine whether the defect must be fixed before release, whether compensating controls are acceptable, or whether formal risk acceptance is appropriate. Ignoring or hiding the issue undermines secure lifecycle governance and may expose customers to unnecessary risk.

Question 5.

Which principle BEST supports giving application components only the permissions they require?

1. Least privilege
2. Open design
3. Maximum availability
4. Shared responsibility

Correct Answer: 1. Least privilege

Explanation:

Least privilege requires users, services, and application components to receive only the permissions necessary to perform their legitimate functions. This reduces the impact of compromise because an attacker cannot automatically exercise unnecessary capabilities. Permissions should also be reviewed as the application evolves so outdated access does not accumulate. Least privilege applies across operating systems, databases, APIs, cloud services, and application roles.

Question 6.

What is the MAIN objective of secure code review?

1. Increase application response speed
2. Identify security weaknesses in source code before release
3. Replace functional testing
4. Eliminate the need for developer training

Correct Answer: 2. Identify security weaknesses in source code before release

Explanation:

Secure code review examines implementation details for flaws such as improper input handling, unsafe authentication logic, authorization errors, insecure cryptographic use, and resource-management problems. Reviews may be manual, automated, or both. Their purpose is to identify vulnerabilities early enough for correction. Code review complements functional testing, dynamic analysis, and penetration testing because each technique finds different classes of defects.

Question 7.

A web application accepts untrusted input that is later displayed in a browser. Which control BEST reduces cross-site scripting risk?

1. Increasing session duration
2. Disabling TLS
3. Context-appropriate output encoding
4. Giving users administrator permissions

Correct Answer: 3. Context-appropriate output encoding

Explanation:

Cross-site scripting occurs when untrusted input is interpreted by the browser as executable content. Context-appropriate output encoding helps ensure that user-controlled data is treated as data rather than active HTML, JavaScript, or other executable content. Input validation and content security policies can provide additional protection. The required encoding depends on where the data is inserted in the page.

Question 8.

Which activity BEST verifies that implemented security controls satisfy documented security requirements?

1. Marketing review
2. Capacity planning
3. Interface design review
4. Security verification and validation testing

Correct Answer: 4. Security verification and validation testing

Explanation:

Verification and validation determine whether security controls were implemented correctly and whether the resulting software satisfies defined requirements. Testing may include static analysis, dynamic testing, penetration testing, abuse cases, and control-specific test cases. Results should be traceable back to requirements. Functional success alone does not demonstrate that security objectives have been met.

Question 9.

Why should developers avoid storing secrets such as API keys directly in source code?

1. Source repositories and build artifacts may expose the secrets to unauthorized parties
2. Hard-coded secrets always improve security
3. Secrets cannot be rotated if stored externally
4. Source code does not require access control

Correct Answer: 1. Source repositories and build artifacts may expose the secrets to unauthorized parties

Explanation:

Hard-coded secrets can leak through repositories, backups, logs, build artifacts, or developer workstations. Once embedded in source code, they can also be difficult to rotate safely. Applications should obtain secrets through approved secrets-management mechanisms or workload identities. Secret access should be restricted, auditable, and aligned with least privilege.

Question 10.

Which secure design practice MOST directly reduces the risk of unauthorized access to functions after authentication?

1. Longer application names
2. Server-side authorization checks for every protected operation
3. Disabling audit logging
4. Relying only on hidden interface elements

Correct Answer: 2. Server-side authorization checks for every protected operation

Explanation:

Authentication establishes who a user is, while authorization determines what that user may do. Sensitive operations should enforce authorization on the trusted server side rather than relying on hidden buttons, client-side logic, or navigation restrictions. Every protected request should be evaluated against current access policy. This helps prevent privilege escalation and direct access to unauthorized functions.

Question 11.

What is the PRIMARY security value of maintaining an inventory of third-party software components?

1. It improves application color consistency
2. It reduces the number of developers required
3. It helps identify applications affected by vulnerable or compromised dependencies
4. It guarantees all third-party code is secure

Correct Answer: 3. It helps identify applications affected by vulnerable or compromised dependencies

Explanation:

Modern applications frequently rely on third-party and open-source components. An accurate component inventory, often supported by a software bill of materials, helps organizations determine where a vulnerable library is used when a security issue is disclosed. This enables faster impact assessment and remediation. Inventory should be combined with dependency monitoring, update processes, and supply-chain controls.

Question 12.

During software deployment, which control BEST helps ensure that only approved code reaches production?

1. Direct developer modification of production servers
2. Shared administrator credentials
3. Disabling deployment logs
4. A controlled deployment pipeline with artifact integrity verification

Correct Answer: 4. A controlled deployment pipeline with artifact integrity verification

Explanation:

A controlled deployment pipeline can enforce testing, approvals, code-signing or integrity verification, separation of duties, and traceability. This reduces the likelihood that unauthorized or modified software reaches production. The pipeline itself should be treated as sensitive infrastructure because compromise of deployment systems can affect many applications. Direct manual modification of production should be tightly restricted.

Question 13.

Which activity BEST supports secure handling of errors in an application?

1. Provide generic user-facing errors while securely logging detailed diagnostic information
2. Display stack traces and database details to every user
3. Disable error logging
4. Include passwords in diagnostic messages

Correct Answer: 1. Provide generic user-facing errors while securely logging detailed diagnostic information

Explanation:

Detailed error messages can reveal internal paths, database structures, software versions, or other information useful to attackers. User-facing responses should therefore provide only the information needed to explain the failure. Detailed diagnostics can be recorded in protected logs for authorized administrators and developers. Logs should avoid unnecessarily recording sensitive credentials or regulated data.

Question 14.

A security requirement states that sensitive information must remain confidential while transmitted across untrusted networks. Which control is MOST appropriate?

1. Data compression
2. Authenticated encrypted transport such as properly configured TLS
3. Additional database indexes
4. Larger application servers

Correct Answer: 2. Authenticated encrypted transport such as properly configured TLS

Explanation:

Encrypted transport protects sensitive data from interception while it crosses networks that cannot be trusted. Proper endpoint authentication also reduces impersonation and man-in-the-middle risk. TLS should be configured using appropriate protocol versions, certificate validation, and cryptographic settings. Encryption in transit complements authentication, authorization, and application-layer protections rather than replacing them.

Question 15.

Why should security defects be tracked through the same disciplined lifecycle as other software defects?

1. Security defects do not affect business risk
2. Tracking removes the need for remediation
3. It provides ownership, prioritization, remediation status, and verification evidence
4. It prevents all future vulnerabilities

Correct Answer: 3. It provides ownership, prioritization, remediation status, and verification evidence

Explanation:

Security defects should be documented, assigned, prioritized, remediated, retested, and formally closed. This creates accountability and makes it possible to monitor unresolved risk. Severity and business impact can guide remediation priority. Consistent defect management also provides evidence that discovered weaknesses were addressed rather than forgotten or informally accepted.

Question 16.

A software team must select between two designs that provide the same required functionality. One is significantly simpler. Which secure design principle generally favors the simpler option?

1. Separation of privilege
2. Complete mediation
3. Defense in depth
4. Economy of mechanism

Correct Answer: 4. Economy of mechanism

Explanation:

Economy of mechanism encourages security designs to be as simple and understandable as practical. Unnecessary complexity can hide errors, create inconsistent behavior, and increase maintenance difficulty. Simpler mechanisms are generally easier to review, test, and operate correctly. This principle does not mean eliminating necessary safeguards; rather, complexity should exist only where it supports a defined security or business requirement.

Question 17.

What is the MAIN purpose of abuse or misuse cases in secure software development?

1. Describe how attackers or unauthorized users might misuse application functionality
2. Replace all normal use cases
3. Measure database performance
4. Select programming tools

Correct Answer: 1. Describe how attackers or unauthorized users might misuse application functionality

Explanation:

Abuse and misuse cases examine how legitimate functions might be manipulated to cause harm. They complement normal use cases by considering attacker objectives, unauthorized actions, fraud, privilege abuse, and unexpected workflows. This analysis can identify missing security requirements and help teams design preventive and detective controls before implementation.

Question 18.

A development team is selecting a third-party library for a security-critical application. Which factor should be considered MOST carefully?

1. The library’s logo
2. Security history, maintenance status, provenance, and vulnerability response process
3. The number of colors in its documentation
4. Whether it is the largest available package

Correct Answer: 2. Security history, maintenance status, provenance, and vulnerability response process

Explanation:

Third-party software introduces supply-chain and lifecycle risk. Teams should evaluate whether the library is actively maintained, how vulnerabilities are handled, whether releases have trustworthy provenance, and whether known weaknesses exist. The organization should also monitor future advisories and updates. Popularity alone does not establish that a component is secure or suitable for a critical application.

Question 19.

A vulnerability is discovered in production software. What should the secure software lifecycle process include?

1. Delete the vulnerability report
2. Wait until the next major version regardless of severity
3. Assess impact, remediate or mitigate, test the fix, and deploy through controlled change
4. Disable all monitoring until the issue is fixed

Correct Answer: 3. Assess impact, remediate or mitigate, test the fix, and deploy through controlled change

Explanation:

Production vulnerabilities require a structured response. The organization should assess severity and exposure, determine appropriate remediation or temporary mitigation, test the change, and deploy it using controlled release procedures. Relevant stakeholders may also need notification. The process should preserve traceability and ensure that the fix does not introduce new defects or weaken other security controls.

Question 20.

Which practice BEST reflects a mature secure software development lifecycle?

1. Perform security testing only after deployment
2. Treat security as the responsibility of one specialist at the end of development
3. Address vulnerabilities only after exploitation
4. Integrate security requirements, design, coding, testing, deployment, and maintenance throughout the lifecycle

Correct Answer: 4. Integrate security requirements, design, coding, testing, deployment, and maintenance throughout the lifecycle

Explanation:

A mature secure software development lifecycle incorporates security from planning through retirement. Requirements establish objectives, secure design reduces architectural weaknesses, coding standards reduce implementation flaws, testing validates controls, controlled deployment protects releases, and maintenance addresses newly discovered vulnerabilities. Security should be shared across development, operations, security, and business stakeholders rather than treated as a single end-of-project activity.