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CompTIA CS0-003 Practice Test 53

Question 520

A vulnerable HR portal contains employee tax records and is reachable by third-party payroll vendors. What is the MOST appropriate analyst action based on the evidence?

  1. Elevate integrity impact even if confidentiality impact appears low.
  2. Keep remediation scheduled but distinguish lower business impact from mission-critical assets.
  3. Coordinate urgent mitigations with OT safety owners before intrusive patch attempts.
  4. Prioritize confidentiality impact and third-party reach in the remediation queue.

Explanation

Correct Answer

D:

Sensitive PII and vendor access increase breach consequences. Prioritize HR portal with sensitive PII.

Incorrect Answers

A:

Unauthorized financial modification can be as damaging as data theft. It would prioritize transaction integrity risk, but it would not prioritize HR portal with sensitive PII.

B:

Business significance and recoverability influence remediation urgency. It could help contextualize low-impact kiosk exposure, but it would not prioritize HR portal with sensitive PII.

C:

Service integrity and availability risks are severe, but unsafe changes can harm operations. That is relevant to business criticality and data types, not to prioritize HR portal with sensitive PII.

Question 521

A vendor releases a patch while incident handlers are still collecting evidence from the affected host. Which next step is MOST defensible for the security team?

  1. Coordinate forensic capture and response priorities before modifying the compromised system.
  2. Reopen the risk assessment and revise compensating controls immediately.
  3. Validate isolation and plan controlled permanent remediation after service stability.
  4. Track the vendor identifier and affected build rather than waiting for CVE assignment.

Explanation

Correct Answer

A:

Unplanned patching can destroy incident evidence or disrupt containment. Align urgent patch with evidence collection.

Incorrect Answers

B:

New exploit capability changes residual risk even without a new CVE. That is relevant to exploit lifecycle and zero-day, not to align urgent patch with evidence collection.

C:

Temporary isolation can buy time without ignoring the vulnerability. It would manage zero-day during critical outage, but it would not align urgent patch with evidence collection.

D:

CVE numbering is not a prerequisite for risk treatment. It could help remediate advisory before CVE publication, but it would not align urgent patch with evidence collection.

Question 522

A service availability defect affects emergency dispatch and a general blog site equally by base score. Which action BEST aligns with sound security operations?

  1. Treat privilege boundary crossing and potential confidentiality, integrity and availability effects as significant.
  2. Assign substantially higher environmental availability impact to emergency dispatch.
  3. Validate confidentiality impact against the actual exposed data.
  4. Evaluate integrity consequences and downstream logistics reliance in risk scoring.

Explanation

Correct Answer

B:

Service criticality changes the real consequence of identical technical defects. Contextualize critical availability dependency.

Incorrect Answers

A:

Elevated execution can affect more than the initially compromised application. That is relevant to cvss impact dimensions, not to contextualize critical availability dependency.

C:

Reachable data that contains nothing sensitive may have limited business consequence. It could help evaluate low confidentiality exposure accurately, but it would not contextualize critical availability dependency.

D:

Corruption of trusted business data can disrupt operations even without disclosure. That is relevant to cvss impact dimensions, not to contextualize critical availability dependency.

Question 523

A known exploit abuses a signed driver with excessive kernel privileges. Which response BEST addresses the security problem described?

  1. Enable supported memory execution protections and keep the browser patched.
  2. Remove or disable the unnecessary component after dependency validation.
  3. Block vulnerable driver versions and maintain trusted driver allowlisting.
  4. Enforce tamper protection and restrict who can change security settings.

Explanation

Correct Answer

C:

Signed status does not guarantee a driver is safe or currently supported. Mitigate bring-your-own-vulnerable-driver attack.

Incorrect Answers

A:

DEP and related mitigations raise exploit difficulty while patching removes flaws. It would reduce browser memory-code execution risk, but it would not mitigate bring-your-own-vulnerable-driver attack.

B:

Eliminating unused functionality reduces available exploit entry points. It could help reduce unused attack surface, but it would not mitigate bring-your-own-vulnerable-driver attack.

D:

Self-protection controls prevent ordinary privileged sessions from silently weakening defense. It would prevent local security control tampering, but it would not mitigate bring-your-own-vulnerable-driver attack.

Question 524

An API accepts only bearer tokens in an Authorization header inaccessible to cross-site scripts. Which investigative or response action BEST fits the evidence?

  1. Add unpredictable anti-CSRF tokens or equivalent trusted-origin validation for sensitive actions.
  2. Validate cryptographic state binding and redirect URI constraints for the flow.
  3. Move state changes to protected methods with CSRF defenses and confirmation.
  4. Evaluate actual cross-origin credential behavior before asserting cookie-based CSRF risk.

Explanation

Correct Answer

D:

CSRF depends on whether a browser automatically supplies an exploitable credential. Assess CSRF applicability to bearer API.

Incorrect Answers

A:

Request authenticity must not rely only on automatically attached cookies. It could help protect transfer action from CSRF, but it would not assess CSRF applicability to bearer API.

B:

OAuth state guards against cross-site authorization response confusion. That is relevant to cross-site request forgery, not to assess CSRF applicability to bearer API.

C:

Read-style URLs should not cause sensitive side effects when embedded elsewhere. It would avoid state-changing GET CSRF exposure, but it would not assess CSRF applicability to bearer API.

Question 525

An attacker-controlled process packages confidential documents into encrypted archives before cloud upload. What is the MOST appropriate analyst action based on the evidence?

  1. Apply endpoint DLP and egress controls based on classification and user authorization.
  2. Require masked approved test datasets and restrict production export rights.
  3. Restrict sharing to approved audiences and require appropriate expiration.
  4. Extend classification-based controls to USB and local file transfer paths.

Explanation

Correct Answer

A:

File encryption does not make unauthorized outbound transfer acceptable. Mitigate encrypted archive exfiltration.

Incorrect Answers

B:

Lower-trust development environments should not hold unnecessary sensitive records. It would stop production data leak to test, but it would not mitigate encrypted archive exfiltration.

C:

Least-privilege link access reduces uncontrolled confidential distribution. It could help harden SaaS guest sharing, but it would not mitigate encrypted archive exfiltration.

D:

Protecting one egress channel leaves alternate data movement routes. That is relevant to defending against data exfiltration, not to mitigate encrypted archive exfiltration.

Question 526

An administration console ships with a default username and password accessible externally. Which next step is MOST defensible for the security team?

  1. Plan replacement and isolate the device with monitored compensating controls in the interim.
  2. Disable default accounts and enforce unique strong authentication with network restrictions.
  3. Remove embedded secrets from images, rotate credentials and provision via secure secret service.
  4. Disable directory listing and remove sensitive backups from the public web root.

Explanation

Correct Answer

B:

Default credentials are widely known and enable simple takeover. Remediate exposed default credentials.

Incorrect Answers

A:

Unsupported components accumulate unresolved security risk. It would manage end-of-life vulnerable appliance, but it would not remediate exposed default credentials.

C:

Image reuse spreads credentials to new systems and potential unauthorized readers. That is relevant to security misconfiguration and legacy components, not to remediate exposed default credentials.

D:

Discovery and retrieval of backup files can disclose credentials and source code. It would block web backup disclosure, but it would not remediate exposed default credentials.

Question 527

A password reset endpoint sends reusable links without expiration. Which action BEST aligns with sound security operations?

  1. Store tokens in platform-protected credential storage and rotate exposed secrets.
  2. Invalidate server-side sessions and tokens upon logout as supported by architecture.
  3. Issue single-use short-lived reset tokens bound to the intended account.
  4. Add adaptive throttling and account-risk monitoring without enabling denial of service by arbitrary lockouts.

Explanation

Correct Answer

C:

Reusable reset links create persistent credential takeover opportunities. Secure password reset token lifecycle.

Incorrect Answers

A:

Tokens function as credentials and require confidentiality at rest. It could help protect mobile bearer tokens, but it would not secure password reset token lifecycle.

B:

Removing browser UI does not necessarily revoke an existing session. That is relevant to authentication and session vulnerabilities, not to secure password reset token lifecycle.

D:

Controlled rate limits reduce automated guessing while retaining service availability. It could help mitigate authentication brute force responsibly, but it would not secure password reset token lifecycle.

Question 528

A vulnerable web API is directly exposed despite WAF restrictions on the main hostname. Which response BEST addresses the security problem described?

  1. Move administration behind restricted network access and stronger identity authentication.
  2. Scope the execution identity to the intended bucket and required API actions.
  3. Segregate management access and use dedicated authenticated operator channels.
  4. Restrict origin access to approved reverse-proxy paths.

Explanation

Correct Answer

D:

Direct origin routing can bypass protective application filtering. Prevent direct-origin WAF bypass.

Incorrect Answers

A:

Network and identity controls together reduce compromise risk. That is relevant to cloud app threat mitigation, not to prevent direct-origin WAF bypass.

B:

Broad cloud permissions increase compromise blast radius. It would tighten serverless function IAM, but it would not prevent direct-origin WAF bypass.

C:

Separating control plane from public data plane reduces privilege attack paths. It could help isolate public messaging management interface, but it would not prevent direct-origin WAF bypass.

Question 529

An object storage API grants anonymous list and read permissions for private reports. Which investigative or response action BEST fits the evidence?

  1. Apply explicit private bucket policy and verify effective anonymous access is denied.
  2. Enforce tenant-aware authorization at the backend service boundary.
  3. Enforce approved role allowlists and strict trust relationships.
  4. Isolate untrusted build execution and prevent secrets injection into unapproved jobs.

Explanation

Correct Answer

A:

Storage confidentiality requires resource-level access enforcement. Close anonymous cloud object access.

Incorrect Answers

B:

Gateway authentication alone cannot stop cross-tenant object access. It could help remediate tenant scope bypass, but it would not close anonymous cloud object access.

C:

Role selection by untrusted input can cross authorization boundaries. That is relevant to cloud authorization and application secrets, not to close anonymous cloud object access.

D:

Build events from outsiders must not access privileged release credentials. It would prevent CI pull-request secret leakage, but it would not close anonymous cloud object access.

Question 530

An API gateway authenticates users but ignores per-tenant scope on downstream requests. What is the MOST appropriate analyst action based on the evidence?

  1. Apply explicit private bucket policy and verify effective anonymous access is denied.
  2. Enforce tenant-aware authorization at the backend service boundary.
  3. Isolate untrusted build execution and prevent secrets injection into unapproved jobs.
  4. Enforce approved role allowlists and strict trust relationships.

Explanation

Correct Answer

B:

Gateway authentication alone cannot stop cross-tenant object access. Remediate tenant scope bypass.

Incorrect Answers

A:

Storage confidentiality requires resource-level access enforcement. It could help close anonymous cloud object access, but it would not remediate tenant scope bypass.

C:

Build events from outsiders must not access privileged release credentials. It would prevent CI pull-request secret leakage, but it would not remediate tenant scope bypass.

D:

Role selection by untrusted input can cross authorization boundaries. It could help prevent confused-deputy cloud role assumption, but it would not remediate tenant scope bypass.


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