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Certified Information Systems Security Professional CISSP Practice Test 56

Question 550

A dynamic web scanner tests only the public login page but misses role-specific internal APIs. As the accountable security practitioner, which response BEST addresses the specific weakness without introducing a different untested control?

  1. Run a web scanner only on the anonymous login page and infer all authenticated API roles are covered.
  2. Run appropriately authorized DAST sessions representing user roles and negative cross-role behavior.
  3. Test only with a global administrator credential that bypasses ordinary-user checks.
  4. Rely on user interface screenshots without exercising back-end API operations under different identities.

Explanation

Correct Answer

B:

Runtime tests require representative authenticated access to detect protected endpoint flaws. A successful scanner login does not establish role/tenant authorization coverage.

Incorrect Answers

A:

Unauthenticated DAST misses authorization and input flows reachable after sign-in.

C:

A single privileged perspective can obscure horizontal and cross-role authorization faults.

D:

Visual coverage is not runtime authorization assessment.

Question 551

The organization implemented the response to this scenario: A dynamic web scanner tests only the public login page but misses role-specific internal APIs. The approved response was: Run appropriately authorized DAST sessions representing user roles and negative cross-role behavior. Which statement MOST accurately identifies a remaining risk or constraint?

  1. A successful scanner login proves every protected API endpoint and tenant role was tested.
  2. Black-box DAST of one role automatically verifies denial of access to every other role’s resources.
  3. A successful scanner login does not establish role/tenant authorization coverage.
  4. Public-site dynamic scanning provides full assurance about internal-only APIs it never invokes.

Explanation

Correct Answer

C:

Runtime tests require representative authenticated access to detect protected endpoint flaws. Admin and ordinary user sessions test both allowed and denied paths across relevant APIs.

Incorrect Answers

A:

Authentication itself does not establish test coverage across privileges and routes.

B:

Cross-role authorization needs explicit negative tests with distinct credentials.

D:

A runtime tool cannot assess unreachable code paths without appropriate access.

Question 552

Management implemented a response after this event: A dynamic web scanner tests only the public login page but misses role-specific internal APIs. The response was: Run appropriately authorized DAST sessions representing user roles and negative cross-role behavior. Which observed outcome BEST verifies that the intended security protection operates, rather than merely appearing in a plan?

  1. The scanner reports no issues on the public page while ordinary users can invoke an admin-only API directly.
  2. All endpoints are tested with an administrator token and no denied user/resource pairs are exercised.
  3. Admin and ordinary user sessions test both allowed and denied paths across relevant APIs.
  4. A DAST dashboard says Complete without any authenticated session mapping for internal APIs.

Explanation

Correct Answer

C:

Admin and ordinary user sessions test both allowed and denied paths across relevant APIs. Runtime tests require representative authenticated access to detect protected endpoint flaws.

Incorrect Answers

A:

A login-page test does not demonstrate protected role behavior.

B:

Positive privileged access is not negative authorization proof.

D:

Completion status alone cannot establish meaningful test coverage.

Question 553

An application’s cloud API key appears in a public source commit. Developers delete the literal from the latest commit, but the build still authenticates using that key. What is the BEST immediate remediation?

  1. Delete only the string from the current branch and continue using the same active secret.
  2. Revoke and rotate the exposed key, replace it with least-privilege short-lived workload identity, and examine repository/history access and downstream misuse.
  3. Rename the key variable but preserve the actual token value in CI configuration.
  4. Make the repository private after exposure and assume all downloaded copies disappear.

Explanation

Correct Answer

B:

A key remains compromised after deletion from a visible revision because copies may exist in history or external caches. Rotation stops use of known credentials; ephemeral scoped identity reduces recurrence.

Incorrect Answers

A:

The compromised credential may already be known to attackers and remains valid regardless of source-file appearance.

C:

Changing the identifier does nothing to invalidate copied secret material.

D:

Privacy setting changes cannot recall previously copied secrets or revoke active authentication tokens.

Question 554

A leaked cloud API key has been revoked and the release pipeline now uses short-lived workload identity. The team removes the exposed string from the latest commit, but cloned repository histories and build logs may contain other service credentials. What is the MOST important remaining exposure to investigate?

  1. Deleting the current repository line guarantees every previously copied credential and build log is now inaccessible.
  2. Identify secrets in history, artifact and runner logs, revoke any other exposed credentials, and restrict retained logs while keeping the new scoped identity.
  3. Restore the revoked permanent administrator key to build documentation because OIDC credentials now expire quickly.
  4. Treat repository privacy changes as proof that old cloned copies and published CI artifacts have been recalled.

Explanation

Correct Answer

B:

Revoking one leaked API key does not contain other secrets already visible in copied history or CI artifacts. Search/limit exposure and rotate each compromised credential; this is distinct from testing token issuer/audience conditions.

Incorrect Answers

A:

History and distributed clones retain copies; the current tree says nothing about other secrets disclosed in earlier jobs.

C:

Reintroducing a reusable privileged key recreates exposure and offers no security benefit to the federated pipeline.

D:

Visibility changes cannot recall prior copies or revoke any unrelated leaked tokens.

Question 555

An enterprise claims a public CI secret leak has been contained and its replacement workflow has least privilege. What test is strongest?

  1. The latest source file contains no key string, but the original API key still works.
  2. Calls using the old key are denied, the approved pipeline deploys with a scoped short-lived identity, and untrusted forks/branches cannot obtain production permissions.
  3. The build succeeds using a permanent administrator token shared across all repositories.
  4. A scan finds no credentials in the newest commit, but repository history and production identity grants are never checked.

Explanation

Correct Answer

B:

The test addresses actual revocation, authorized functionality and negative federation trust boundaries.

Incorrect Answers

A:

A clean diff is not credential revocation; attackers may hold the old value.

C:

Functional success with long-lived broad privileges repeats the unsafe secret model.

D:

Limited scanning does not establish containment or improved runtime authorization.

Question 556

Two production regions rebuild the same Git tag and ship different dependency versions. Which release design BEST ensures they run identical approved bytes?

  1. Rebuild independently in each region and trust the tag name to guarantee the same result.
  2. Compare only the application version displayed in the UI.
  3. Disable dependency checks so builds become faster and supposedly identical.
  4. Build once in a trusted pipeline, identify the tested artifact by cryptographic digest, attest its provenance and promote that artifact.

Explanation

Correct Answer

D:

Rebuilding mutable inputs can produce different binaries despite identical source tags.

Incorrect Answers

A:

A tag does not freeze external dependencies or all build-tool inputs.

B:

Human-readable versions are not cryptographic proof of artifact identity.

C:

Skipping supply-chain validation can worsen risk and does not ensure deterministic output.

Question 557

An immutable artifact is signed and promoted by digest. What residual risk STILL exists?

  1. A signature guarantees every bundled library has no exploitable weakness.
  2. A compromised trusted build identity could sign malicious artifacts; provenance trust roots and material inputs need protection.
  3. An artifact digest remains unchanged even if its bytes are modified.
  4. Verified promotion makes deployment authorization policies unnecessary.

Explanation

Correct Answer

B:

A valid signature proves the signer, not automatically that produced code is safe.

Incorrect Answers

A:

Authenticity is not comprehensive vulnerability assurance.

C:

A cryptographic digest is intended to expose content changes.

D:

Who may promote artifacts remains a separate access-control decision.

Question 558

Which test BEST demonstrates artifact promotion integrity across two regions?

  1. Confirm the two regions display the same version label.
  2. Compare production content digests and signed build provenance to the single security-approved tested artifact in both regions.
  3. Ask two operators whether they used the latest tag.
  4. Count the number of deployment jobs that finished successfully.

Explanation

Correct Answer

B:

Byte identity and trusted provenance bind both deployments to the reviewed supply-chain outcome.

Incorrect Answers

A:

Labels can match while dependency bytes and compiled artifacts differ.

C:

Memory cannot prove cryptographic identity or dependency provenance.

D:

Job completion does not prove deployed packages match the approved artifact.

Question 559

Pull requests from untrusted contributors run on self-hosted privileged runners with live production credentials. As the accountable security practitioner, which response BEST addresses the specific weakness without introducing a different untested control?

  1. Execute untrusted external pull-request code on a privileged self-hosted runner with live production tokens.
  2. Isolate untrusted builds and withhold sensitive credentials and deployment authority until trusted approval.
  3. Allow protected deployment credentials to be printed in fork builds for faster troubleshooting.
  4. Use branch protection alone while workflow triggers still expose powerful secrets before code is reviewed.

Explanation

Correct Answer

B:

Untrusted code can execute inside CI and steal secrets or alter host state. Repository branch protection is insufficient if workflow triggers expose secrets to unreviewed jobs.

Incorrect Answers

A:

Attacker-controlled test steps may steal secrets or alter the host and production resources.

C:

Untrusted contributors must not have a path to production secrets.

D:

Repository settings cannot replace isolated execution and credential release boundaries.

Question 560

The organization implemented the response to this scenario: Pull requests from untrusted contributors run on self-hosted privileged runners with live production credentials. The approved response was: Isolate untrusted builds and withhold sensitive credentials and deployment authority until trusted approval. Which statement MOST accurately identifies a remaining risk or constraint?

  1. Branch protection guarantees no unreviewed pull-request job can access tokens on privileged runners.
  2. Repository branch protection is insufficient if workflow triggers expose secrets to unreviewed jobs.
  3. A signed build output proves the executing CI worker was trustworthy even if it ran attacker-controlled code.
  4. An ephemeral runner is safe by definition when it still has production administrator credentials during the untrusted test.

Explanation

Correct Answer

B:

Untrusted code can execute inside CI and steal secrets or alter host state. A malicious test PR cannot access protected tokens or modify production resources.

Incorrect Answers

A:

Workflow event semantics and runner permissions can expose secrets despite branch rules.

C:

Artifact signatures need trusted build identity and source/process provenance.

D:

Short lifetime does not remove immediate exfiltration opportunities.

Certified Information Systems Security Professional (CISSP) Practice Tests

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