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CompTIA CS0-003 Practice Test 55

Question 540

An image recognition workflow trusts metadata fields submitted by untrusted users to make safety decisions. What is the MOST appropriate analyst action based on the evidence?

  1. Add authorization-aware quotas and abuse limits during architectural redesign.
  2. Validate dataset provenance and apply review gates for high-impact training updates.
  3. Enforce separation of duties and distinct approval authority.
  4. Independently validate critical attributes against trusted signals.

Explanation

Correct Answer

D:

Self-declared metadata can be manipulated to bypass model or business controls. Prevent attacker-supplied metadata poisoning.

Incorrect Answers

A:

Insecure design creates systemic resource exhaustion beyond one coding bug. That is relevant to insecure design and data poisoning, not to prevent attacker-supplied metadata poisoning.

B:

Untrusted labels can poison model behavior even when code is bug-free. It would mitigate training-data poisoning, but it would not prevent attacker-supplied metadata poisoning.

C:

Transaction integrity requires governance controls, not just secure software code. It could help fix missing dual control in payment design, but it would not prevent attacker-supplied metadata poisoning.

Question 541

A compromised employee login grants broad internal file access because all users share one role. Which next step is MOST defensible for the security team?

  1. Implement least-privilege RBAC and review sensitive resource authorization.
  2. Require phishing-resistant MFA and restricted privileged access channels.
  3. Replace hard-coded credentials with short-lived scoped identities and vaulted secrets.
  4. Enable password blocklists and strong account compromise monitoring.

Explanation

Correct Answer

A:

Reducing default reach limits the impact of stolen credentials. Mitigate flat authorization exposure.

Incorrect Answers

B:

Strong second factors reduce impact of stolen primary credentials. It could help harden admin login against phishing, but it would not mitigate flat authorization exposure.

C:

Ephemeral credentials reduce exposure and limit replay windows. That is relevant to protection against credential misuse, not to mitigate flat authorization exposure.

D:

Known-compromised credentials increase password-stuffing success risk. It would block known breached passwords, but it would not mitigate flat authorization exposure.

Question 542

A download endpoint allows `../../` input to read files outside its authorized directory. Which action BEST aligns with sound security operations?

  1. Allowlist template identifiers and avoid direct filesystem path construction.
  2. Canonicalize paths and enforce access against a fixed approved file root.
  3. Replace remote includes with strict server-owned module mappings.
  4. Decode and normalize fully before applying root-path authorization.

Explanation

Correct Answer

B:

Directory bounds must be checked after resolving traversal sequences. Prevent local directory traversal.

Incorrect Answers

A:

Trusted identifiers prevent traversal to sensitive local files. It could help prevent local file inclusion through template name, but it would not prevent local directory traversal.

C:

User-controlled inclusion can fetch attacker-controlled executable content. It would mitigate remote file inclusion, but it would not prevent local directory traversal.

D:

Validation order can permit encoded traversal bypasses. It could help close encoded traversal validation gap, but it would not prevent local directory traversal.

Question 543

A login endpoint lacks rate limits and allows rapid credential attempts against one account. Which response BEST addresses the security problem described?

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

Explanation

Correct Answer

C:

Controlled rate limits reduce automated guessing while retaining service availability. Mitigate authentication brute force responsibly.

Incorrect Answers

A:

Reusable reset links create persistent credential takeover opportunities. That is relevant to authentication and session vulnerabilities, not to mitigate authentication brute force responsibly.

B:

Tokens function as credentials and require confidentiality at rest. It would protect mobile bearer tokens, but it would not mitigate authentication brute force responsibly.

D:

Removing browser UI does not necessarily revoke an existing session. That is relevant to authentication and session vulnerabilities, not to mitigate authentication brute force responsibly.

Question 544

A vendor appliance is out of support and no future patches are available. Which investigative or response action BEST fits the evidence?

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

Explanation

Correct Answer

D:

Unsupported components accumulate unresolved security risk. Manage end-of-life vulnerable appliance.

Incorrect Answers

A:

Discovery and retrieval of backup files can disclose credentials and source code. It would block web backup disclosure, but it would not manage end-of-life vulnerable appliance.

B:

Image reuse spreads credentials to new systems and potential unauthorized readers. It could help remediate secrets embedded in machine image, but it would not manage end-of-life vulnerable appliance.

C:

Default credentials are widely known and enable simple takeover. That is relevant to security misconfiguration and legacy components, not to manage end-of-life vulnerable appliance.

Question 545

A privileged automation service uses long-lived static passwords stored in scripts. What is the MOST appropriate analyst action based on the evidence?

  1. Replace hard-coded credentials with short-lived scoped identities and vaulted secrets.
  2. Require phishing-resistant MFA and restricted privileged access channels.
  3. Enable password blocklists and strong account compromise monitoring.
  4. Implement least-privilege RBAC and review sensitive resource authorization.

Explanation

Correct Answer

A:

Ephemeral credentials reduce exposure and limit replay windows. Replace long-lived automation credentials.

Incorrect Answers

B:

Strong second factors reduce impact of stolen primary credentials. That is relevant to protection against credential misuse, not to replace long-lived automation credentials.

C:

Known-compromised credentials increase password-stuffing success risk. It would block known breached passwords, but it would not replace long-lived automation credentials.

D:

Reducing default reach limits the impact of stolen credentials. It could help mitigate flat authorization exposure, but it would not replace long-lived automation credentials.

Question 546

A PHP page dynamically includes a remote URL supplied by an unauthenticated visitor. Which next step is MOST defensible for the security team?

  1. Decode and normalize fully before applying root-path authorization.
  2. Replace remote includes with strict server-owned module mappings.
  3. Canonicalize paths and enforce access against a fixed approved file root.
  4. Allowlist template identifiers and avoid direct filesystem path construction.

Explanation

Correct Answer

B:

User-controlled inclusion can fetch attacker-controlled executable content. Mitigate remote file inclusion.

Incorrect Answers

A:

Validation order can permit encoded traversal bypasses. That is relevant to path traversal and file inclusion, not to mitigate remote file inclusion.

C:

Directory bounds must be checked after resolving traversal sequences. It could help prevent local directory traversal, but it would not mitigate remote file inclusion.

D:

Trusted identifiers prevent traversal to sensitive local files. That is relevant to path traversal and file inclusion, not to mitigate remote file inclusion.

Question 547

A feedback page echoes a comment into HTML without encoding, allowing scripts. Which action BEST aligns with sound security operations?

  1. Use safe text APIs or context-aware sanitization instead of unsafe DOM sinks.
  2. Sanitize allowed HTML and enforce safe rendering with a restrictive CSP as defense in depth.
  3. Encode untrusted content for the HTML output context.
  4. Implement a restrictive tested CSP while fixing underlying unsafe input handling.

Explanation

Correct Answer

C:

Context-specific output encoding prevents input becoming executable markup. Mitigate reflected XSS through encoding.

Incorrect Answers

A:

Dynamic DOM insertion can execute scripts even without server-side reflection. It would prevent DOM-based XSS sink, but it would not mitigate reflected XSS through encoding.

B:

Persistent user-supplied markup needs controlled allowed content and browser execution restrictions. It could help mitigate persistent XSS in stored profiles, but it would not mitigate reflected XSS through encoding.

D:

CSP can reduce exploit impact but does not replace safe rendering. It would add CSP as XSS defense in depth, but it would not mitigate reflected XSS through encoding.

Question 548

A session cookie is readable by JavaScript and third-party scripts run on the page. Which response BEST addresses the security problem described?

  1. Apply an appropriate SameSite policy after testing legitimate integration flows.
  2. Revoke or rotate affected sessions after security-sensitive credential changes.
  3. Mark sensitive cookies Secure and eliminate HTTP exposure for authenticated sessions.
  4. Use HttpOnly for authentication cookies and constrain third-party script execution.

Explanation

Correct Answer

D:

HttpOnly reduces credential theft through client-side script access. Prevent script-accessible auth cookie theft.

Incorrect Answers

A:

SameSite restrictions reduce ambient credential use in cross-site requests. It could help tighten unnecessary cross-site cookie use, but it would not prevent script-accessible auth cookie theft.

B:

Password changes alone may not invalidate stolen session tokens. That is relevant to session and browser protections, not to prevent script-accessible auth cookie theft.

C:

Secure cookies reduce transmission over unencrypted connections. It would protect cookies over HTTPS, but it would not prevent script-accessible auth cookie theft.

Question 549

An exploit chain requires an exposed scripting engine that the application never uses. Which investigative or response action BEST fits the evidence?

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

Explanation

Correct Answer

A:

Eliminating unused functionality reduces available exploit entry points. Reduce unused attack surface.

Incorrect Answers

B:

Self-protection controls prevent ordinary privileged sessions from silently weakening defense. It would prevent local security control tampering, but it would not reduce unused attack surface.

C:

Signed status does not guarantee a driver is safe or currently supported. It could help mitigate bring-your-own-vulnerable-driver attack, but it would not reduce unused attack surface.

D:

DEP and related mitigations raise exploit difficulty while patching removes flaws. That is relevant to endpoint exploit mitigations, not to reduce unused attack surface.

Question 550

A user changes their password but all existing sessions remain valid indefinitely. What is the MOST appropriate analyst action based on the evidence?

  1. Use HttpOnly for authentication cookies and constrain third-party script execution.
  2. Revoke or rotate affected sessions after security-sensitive credential changes.
  3. Apply an appropriate SameSite policy after testing legitimate integration flows.
  4. Mark sensitive cookies Secure and eliminate HTTP exposure for authenticated sessions.

Explanation

Correct Answer

B:

Password changes alone may not invalidate stolen session tokens. Terminate stale sessions after password reset.

Incorrect Answers

A:

HttpOnly reduces credential theft through client-side script access. It would prevent script-accessible auth cookie theft, but it would not terminate stale sessions after password reset.

C:

SameSite restrictions reduce ambient credential use in cross-site requests. That is relevant to session and browser protections, not to terminate stale sessions after password reset.

D:

Secure cookies reduce transmission over unencrypted connections. It would protect cookies over HTTPS, but it would not terminate stale sessions after password reset.


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