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CompTIA CySA+ (CS0-003) CS0-003 Practice Test 24

Question 230

A service reads arbitrary URLs supplied by clients and can fetch private cloud metadata endpoints inaccessible to ordinary users. What risk mechanism should guide the analyst’s judgment?

  1. A server can access only the public internet when a client supplies an external URL.
  2. URL encoding and redirects cannot change the effective network destination.
  3. Server-side request forgery abuses the server's network reachability rather than the attacker's own access.
  4. A service's own cloud role is irrelevant when requests reach metadata endpoints.

Explanation

Correct Answer

C:

This interpretation explains the observation without treating a clue as proof beyond its scope. The central mechanism is: Server-side request forgery abuses the server's network reachability rather than the attacker's own access. It directs the analyst toward: Restrict outbound destinations and metadata access, resolve and validate URLs safely, and enforce least-privilege service identity.

Incorrect Answers

A:

A server can access only the public internet when a client supplies an external URL. This alternative causal claim assumes facts beyond the observation, which is: A service reads arbitrary URLs supplied by clients and can fetch private cloud metadata endpoints inaccessible to ordinary users. The directly supported mechanism is: Server-side request forgery abuses the server's network reachability rather than the attacker's own access.

B:

URL encoding and redirects cannot change the effective network destination. This alternative causal claim assumes facts beyond the observation, which is: A service reads arbitrary URLs supplied by clients and can fetch private cloud metadata endpoints inaccessible to ordinary users. The directly supported mechanism is: Server-side request forgery abuses the server's network reachability rather than the attacker's own access.

D:

A service's own cloud role is irrelevant when requests reach metadata endpoints. This alternative causal claim assumes facts beyond the observation, which is: A service reads arbitrary URLs supplied by clients and can fetch private cloud metadata endpoints inaccessible to ordinary users. The directly supported mechanism is: Server-side request forgery abuses the server's network reachability rather than the attacker's own access.

Question 231

A service reads arbitrary URLs supplied by clients and can fetch private cloud metadata endpoints inaccessible to ordinary users. Which result would most directly verify that the investigation or mitigation addressed this case?

  1. The visible URL passes validation but a redirect retrieves private metadata.
  2. One metadata hostname is blocked while an alternate address still reaches it.
  3. Authorized tests cannot reach private metadata or unauthorized internal endpoints through the service.
  4. The service responds normally to public URLs but no private-endpoint rejection is tested.

Explanation

Correct Answer

C:

This check measures the particular condition that the response was intended to change, rather than unrelated activity or a generic dashboard count. Specifically: Authorized tests cannot reach private metadata or unauthorized internal endpoints through the service. It tests whether: Restrict outbound destinations and metadata access, resolve and validate URLs safely, and enforce least-privilege service identity.

Incorrect Answers

A:

The visible URL passes validation but a redirect retrieves private metadata. This test or metric does not demonstrate the complete target effect of Restrict outbound destinations and metadata access, resolve and validate URLs safely, and enforce least-privilege service identity. The decisive observable confirmation is: Authorized tests cannot reach private metadata or unauthorized internal endpoints through the service.

B:

One metadata hostname is blocked while an alternate address still reaches it. This test or metric does not demonstrate the complete target effect of Restrict outbound destinations and metadata access, resolve and validate URLs safely, and enforce least-privilege service identity. The decisive observable confirmation is: Authorized tests cannot reach private metadata or unauthorized internal endpoints through the service.

D:

The service responds normally to public URLs but no private-endpoint rejection is tested. This test or metric does not demonstrate the complete target effect of Restrict outbound destinations and metadata access, resolve and validate URLs safely, and enforce least-privilege service identity. The decisive observable confirmation is: Authorized tests cannot reach private metadata or unauthorized internal endpoints through the service.

Question 232

A service reads arbitrary URLs supplied by clients and can fetch private cloud metadata endpoints inaccessible to ordinary users. What limitation would still matter after the initial action succeeds?

  1. An application service account might retain unused internal API privileges.
  2. The service identity might retain overbroad permissions to internal metadata even with outbound filtering.
  3. A cloud network policy might still permit approved diagnostic endpoints used by unrelated services.
  4. Alternate URL encodings and redirects can bypass incomplete destination validation.

Explanation

Correct Answer

D:

The response does not eliminate all future or hidden exposures. This particular follow-on issue is connected to the case: Alternate URL encodings and redirects can bypass incomplete destination validation. The initial control is: Restrict outbound destinations and metadata access, resolve and validate URLs safely, and enforce least-privilege service identity.

Incorrect Answers

A:

An application service account might retain unused internal API privileges. This is a conceivable secondary or conditional concern, but is not the residual exposure most directly tied to the scenario and its chosen response. Alternate URL encodings and redirects can bypass incomplete destination validation.

B:

The service identity might retain overbroad permissions to internal metadata even with outbound filtering. This is a conceivable secondary or conditional concern, but is not the residual exposure most directly tied to the scenario and its chosen response. Alternate URL encodings and redirects can bypass incomplete destination validation.

C:

A cloud network policy might still permit approved diagnostic endpoints used by unrelated services. This concerns an adjacent administrative, operational or conditional risk, not the particular continuing weakness supported most directly by A service reads arbitrary URLs supplied by clients and can fetch private cloud metadata endpoints inaccessible to ordinary users. The specific case-derived residual is: Alternate URL encodings and redirects can bypass incomplete destination validation.

Question 233

A support portal trusts client-supplied file paths and returns files outside its approved document directory. What is the most defensible response to this situation?

  1. Normalize paths and enforce a server-side allowlist constrained to the approved file root.
  2. Strip one literal ../ sequence and trust all other path encodings.
  3. Verify that the user is logged in, then concatenate the user-supplied relative path into the file-system path without canonicalizing it.
  4. Validate file extensions while still allowing paths outside the permitted root.

Explanation

Correct Answer

A:

The selected step uses the available evidence proportionately and directly addresses the specific condition. The governing technical issue is: Untrusted path components can traverse directories when the application does not verify resolved locations. The relevant next action is: Normalize paths and enforce a server-side allowlist constrained to the approved file root.

Incorrect Answers

B:

Strip one literal ../ sequence and trust all other path encodings. This option does not establish the stated result with sufficient evidence. Untrusted path components can traverse directories when the application does not verify resolved locations. The case therefore requires a different action: Normalize paths and enforce a server-side allowlist constrained to the approved file root.

C:

Being logged in does not prevent traversal through ../ or encoded path variants. Canonicalization and server-side approved-root containment are required.

D:

Validate file extensions while still allowing paths outside the permitted root. This option does not establish the stated result with sufficient evidence. Untrusted path components can traverse directories when the application does not verify resolved locations. The case therefore requires a different action: Normalize paths and enforce a server-side allowlist constrained to the approved file root.

Question 234

A support portal trusts client-supplied file paths and returns files outside its approved document directory. What risk mechanism should guide the analyst’s judgment?

  1. A file path is safe if it ends in an approved extension regardless of location.
  2. Untrusted path components can traverse directories when the application does not verify resolved locations.
  3. Client-provided relative paths cannot escape a server's document root.
  4. Encoded traversal components are never interpreted by path-normalization routines.

Explanation

Correct Answer

B:

This interpretation explains the observation without treating a clue as proof beyond its scope. The central mechanism is: Untrusted path components can traverse directories when the application does not verify resolved locations. It directs the analyst toward: Normalize paths and enforce a server-side allowlist constrained to the approved file root.

Incorrect Answers

A:

A file path is safe if it ends in an approved extension regardless of location. This alternative causal claim assumes facts beyond the observation, which is: A support portal trusts client-supplied file paths and returns files outside its approved document directory. The directly supported mechanism is: Untrusted path components can traverse directories when the application does not verify resolved locations.

C:

Client-provided relative paths cannot escape a server's document root. This alternative causal claim assumes facts beyond the observation, which is: A support portal trusts client-supplied file paths and returns files outside its approved document directory. The directly supported mechanism is: Untrusted path components can traverse directories when the application does not verify resolved locations.

D:

Encoded traversal components are never interpreted by path-normalization routines. This alternative causal claim assumes facts beyond the observation, which is: A support portal trusts client-supplied file paths and returns files outside its approved document directory. The directly supported mechanism is: Untrusted path components can traverse directories when the application does not verify resolved locations.

Question 235

A support portal trusts client-supplied file paths and returns files outside its approved document directory. Which result would most directly verify that the investigation or mitigation addressed this case?

  1. A normal support document opens but a crafted encoded traversal still reads outside files.
  2. One literal ../ payload is denied while an alternate representation succeeds.
  3. Controlled traversal tests are denied while permitted support documents load normally.
  4. The interface hides parent folders but direct requests still fetch protected paths.

Explanation

Correct Answer

C:

This check measures the particular condition that the response was intended to change, rather than unrelated activity or a generic dashboard count. Specifically: Controlled traversal tests are denied while permitted support documents load normally. It tests whether: Normalize paths and enforce a server-side allowlist constrained to the approved file root.

Incorrect Answers

A:

A normal support document opens but a crafted encoded traversal still reads outside files. This test or metric does not demonstrate the complete target effect of Normalize paths and enforce a server-side allowlist constrained to the approved file root. The decisive observable confirmation is: Controlled traversal tests are denied while permitted support documents load normally.

B:

One literal ../ payload is denied while an alternate representation succeeds. This test or metric does not demonstrate the complete target effect of Normalize paths and enforce a server-side allowlist constrained to the approved file root. The decisive observable confirmation is: Controlled traversal tests are denied while permitted support documents load normally.

D:

The interface hides parent folders but direct requests still fetch protected paths. This test or metric does not demonstrate the complete target effect of Normalize paths and enforce a server-side allowlist constrained to the approved file root. The decisive observable confirmation is: Controlled traversal tests are denied while permitted support documents load normally.

Question 236

A support portal trusts client-supplied file paths and returns files outside its approved document directory. What limitation would still matter after the initial action succeeds?

  1. Filesystem permissions on the approved document root might be overly permissive for ordinary service accounts.
  2. Symlink handling could differ between approved filesystem roots.
  3. An authorized archive export could retain sensitive temporary files longer than needed.
  4. Other upload or archive-extraction routes may have separate path traversal weaknesses.

Explanation

Correct Answer

D:

The response does not eliminate all future or hidden exposures. This particular follow-on issue is connected to the case: Other upload or archive-extraction routes may have separate path traversal weaknesses. The initial control is: Normalize paths and enforce a server-side allowlist constrained to the approved file root.

Incorrect Answers

A:

Filesystem permissions on the approved document root might be overly permissive for ordinary service accounts. This is a conceivable secondary or conditional concern, but is not the residual exposure most directly tied to the scenario and its chosen response. Other upload or archive-extraction routes may have separate path traversal weaknesses.

B:

Symlink handling could differ between approved filesystem roots. This is a conceivable secondary or conditional concern, but is not the residual exposure most directly tied to the scenario and its chosen response. Other upload or archive-extraction routes may have separate path traversal weaknesses.

C:

An authorized archive export could retain sensitive temporary files longer than needed. This is a conceivable secondary or conditional concern, but is not the residual exposure most directly tied to the scenario and its chosen response. Other upload or archive-extraction routes may have separate path traversal weaknesses.

Question 237

A mobile app stores long-lived authentication tokens in publicly readable device files. What is the most defensible response to this situation?

  1. Obfuscate tokens in app preferences while keeping them publicly readable.
  2. Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials.
  3. Extend token expiration to reduce login prompts on compromised devices.
  4. Restrict server login attempts without changing insecure local token storage.

Explanation

Correct Answer

B:

The selected step uses the available evidence proportionately and directly addresses the specific condition. The governing technical issue is: Client-side file exposure can allow token theft even if back-end credential checks are robust. The relevant next action is: Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials.

Incorrect Answers

A:

Obfuscate tokens in app preferences while keeping them publicly readable. This option does not establish the stated result with sufficient evidence. Client-side file exposure can allow token theft even if back-end credential checks are robust. The case therefore requires a different action: Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials.

C:

Extend token expiration to reduce login prompts on compromised devices. This option does not establish the stated result with sufficient evidence. Client-side file exposure can allow token theft even if back-end credential checks are robust. The case therefore requires a different action: Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials.

D:

Restrict server login attempts without changing insecure local token storage. This option does not establish the stated result with sufficient evidence. Client-side file exposure can allow token theft even if back-end credential checks are robust. The case therefore requires a different action: Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials.

Question 238

A mobile app stores long-lived authentication tokens in publicly readable device files. What risk mechanism should guide the analyst’s judgment?

  1. Client-side file exposure can allow token theft even if back-end credential checks are robust.
  2. Back-end credential validation prevents theft of an already stored bearer token.
  3. A long-lived token becomes safe merely because it is base64 encoded.
  4. Token secrecy depends only on HTTPS, regardless of local file permissions.

Explanation

Correct Answer

A:

This interpretation explains the observation without treating a clue as proof beyond its scope. The central mechanism is: Client-side file exposure can allow token theft even if back-end credential checks are robust. It directs the analyst toward: Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials.

Incorrect Answers

B:

Back-end credential validation prevents theft of an already stored bearer token. This alternative causal claim assumes facts beyond the observation, which is: A mobile app stores long-lived authentication tokens in publicly readable device files. The directly supported mechanism is: Client-side file exposure can allow token theft even if back-end credential checks are robust.

C:

A long-lived token becomes safe merely because it is base64 encoded. This alternative causal claim assumes facts beyond the observation, which is: A mobile app stores long-lived authentication tokens in publicly readable device files. The directly supported mechanism is: Client-side file exposure can allow token theft even if back-end credential checks are robust.

D:

Token secrecy depends only on HTTPS, regardless of local file permissions. This alternative causal claim assumes facts beyond the observation, which is: A mobile app stores long-lived authentication tokens in publicly readable device files. The directly supported mechanism is: Client-side file exposure can allow token theft even if back-end credential checks are robust.

Question 239

A mobile app stores long-lived authentication tokens in publicly readable device files. Which result would most directly verify that the investigation or mitigation addressed this case?

  1. A login request succeeds while another mobile app can still read token files.
  2. The app uses a new token format but no local access-control test is performed.
  3. The server logs fewer password attempts but stolen sessions remain valid.
  4. Filesystem permission tests and token rotation show the secret is no longer readable by unrelated apps.

Explanation

Correct Answer

D:

This check measures the particular condition that the response was intended to change, rather than unrelated activity or a generic dashboard count. Specifically: Filesystem permission tests and token rotation show the secret is no longer readable by unrelated apps. It tests whether: Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials.

Incorrect Answers

A:

A login request succeeds while another mobile app can still read token files. This test or metric does not demonstrate the complete target effect of Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials. The decisive observable confirmation is: Filesystem permission tests and token rotation show the secret is no longer readable by unrelated apps.

B:

The app uses a new token format but no local access-control test is performed. This test or metric does not demonstrate the complete target effect of Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials. The decisive observable confirmation is: Filesystem permission tests and token rotation show the secret is no longer readable by unrelated apps.

C:

The server logs fewer password attempts but stolen sessions remain valid. This test or metric does not demonstrate the complete target effect of Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials. The decisive observable confirmation is: Filesystem permission tests and token rotation show the secret is no longer readable by unrelated apps.

Question 240

A mobile app stores long-lived authentication tokens in publicly readable device files. What limitation would still matter after the initial action succeeds?

  1. A mobile device backup might expose old tokens retained under a separate encryption key.
  2. Compromised or rooted devices may still defeat local storage assumptions.
  3. Token rotation may not immediately invalidate older server sessions.
  4. A customer migration might leave unused local cache entries after a mobile application reinstall.

Explanation

Correct Answer

B:

The response does not eliminate all future or hidden exposures. This particular follow-on issue is connected to the case: Compromised or rooted devices may still defeat local storage assumptions. The initial control is: Move tokens into platform-protected storage, shorten lifetime and rotate exposed credentials.

Incorrect Answers

A:

A mobile device backup might expose old tokens retained under a separate encryption key. This is a conceivable secondary or conditional concern, but is not the residual exposure most directly tied to the scenario and its chosen response. Compromised or rooted devices may still defeat local storage assumptions.

C:

Token rotation may not immediately invalidate older server sessions. This is a conceivable secondary or conditional concern, but is not the residual exposure most directly tied to the scenario and its chosen response. Compromised or rooted devices may still defeat local storage assumptions.

D:

A customer migration might leave unused local cache entries after a mobile application reinstall. This concerns an adjacent administrative, operational or conditional risk, not the particular continuing weakness supported most directly by A mobile app stores long-lived authentication tokens in publicly readable device files. The specific case-derived residual is: Compromised or rooted devices may still defeat local storage assumptions.

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