ECCouncil 312-50v13 (Certified Ethical Hacker v13) Practice Test 55

Question 540

The approved engagement produces this evidence: A user receives dozens of unexpected authentication approval notifications until one is approved just to stop the alerts. What is the correct technical interpretation?

  1. Spear phishing
  2. MFA push fatigue
  3. Smishing
  4. Synthetic-voice impersonation

Explanation

Correct Answer

B:

Push bombing relies on repeated authentication prompts and user fatigue, sometimes combined with attacker contact, to gain an accidental approval. This is why teams should use number matching and phishing-resistant authentication with prompt anomaly alerts; challenge context and stronger factors reduce blind approvals, while alerting and throttling expose the repetitive abuse pattern.

Incorrect Answers

A:

Spear phishing targets a specific person or group using tailored context rather than sending the same generic bait to a broad population; the events given do not establish this behavior but do support MFA push fatigue.

C:

Smishing delivers phishing content through text messaging; the medium often creates pressure to follow a short link on a mobile device; those prerequisites differ from the MFA push fatigue behavior in the record.

D:

AI-generated voice impersonation can mimic recognizable speech, so an apparent familiar voice is not sufficient identity proof; this would classify another type of evidence, whereas the actual finding shows MFA push fatigue.

Question 541

A control review considers a verified technical issue: A company wants to ensure that disclosure of a web server's certificate private key next year cannot decrypt recordings of last month's authenticated TLS sessions. Which mitigation most directly addresses its cause?

  1. Deploy correct certificate chains and validate trusted roots and hostnames
  2. Guarantee unique nonces per encryption key and rotate affected keys
  3. Prefer TLS cipher suites using ephemeral ECDHE key exchange
  4. Manage recipient certificates and private keys for encrypted S-MIME messages

Explanation

Correct Answer

C:

Fresh per-session key material limits retrospective exposure, provided ephemeral secrets were not separately compromised or logged. The underlying condition is that forward secrecy uses ephemeral key exchange so recorded session traffic cannot normally be decrypted solely from a later compromise of the server's long-term authentication key.

Incorrect Answers

A:

Proper chain and identity checks prevent arbitrary signed certificates from being treated as proof that a service is the intended endpoint; the proposed improvement would make sense for PKI trust chain but not as the main fix here; the tested fault instead involves forward secrecy.

B:

Nonce-generation discipline protects the authentication construction, while key rotation limits exposure after uniqueness guarantees have failed; the specific root cause belongs to forward secrecy, beyond this control's intended scope.

D:

Verified certificates and sound key custody enable intended recipients to decrypt content while supporting sender authenticity when messages are signed; it would improve S-MIME encrypted email, not directly correct the reported forward secrecy issue.

Question 542

The owner asks for a durable safeguard against the issue demonstrated here: A port is marked secure solely because a TCP handshake completes, without examining the server certificate, protocol negotiation, or enabled legacy cryptographic versions. What is the best response?

  1. Validate ambiguous UDP results with protocol-aware requests
  2. Use layered scan detection and verify FIN findings with ordinary service probes
  3. Patch identified software and minimize optional version disclosure
  4. Review supported TLS versions and certificate validation on the real service

Explanation

Correct Answer

D:

Hardening protocol negotiation and certificate chains prevents downgrade and impersonation weaknesses that a simple open-port scan cannot detect. This matters for the observed attack path because a TLS handshake probe identifies negotiated protocols, cipher suites, and certificate identity; bare TCP availability does not prove encryption.

Incorrect Answers

A:

Application-specific probes and correlated firewall logs help distinguish a silent UDP listener from network filtering without guessing from silence; the required correction concerns TLS endpoint inspection, so this is not the targeted control.

B:

Anomaly telemetry can flag unusual TCP flags, and corroborating normal connection behavior prevents treating silent responses as proof of openness; its security benefit applies principally to TCP FIN scan, not the defect described; the tested fault instead involves TLS endpoint inspection.

C:

Version knowledge supports accurate inventory and remediation; changing a port or suppressing a banner alone does not remove vulnerable code; the exposure here is TLS endpoint inspection, which calls for another protective mechanism.

Question 543

A follow-up review must reduce the risk revealed here: Investigators remove a malicious interactive process, but it reappears at exactly 02:00 daily under a service identity because a scheduled job was added during the intrusion. Which defensive measure fits the specific failure mode?

  1. Audit task creation and enforce authorization for scheduled execution
  2. Forward protected logs off-host and alert on log-service disruption
  3. Use salted memory-hard password hashing and strong password policy
  4. Require Kerberos preauthentication and strengthen affected account passwords
  5. Review authorized keys and centrally manage approved SSH principals
  6. Use safe library loading and protect application directories

Explanation

Correct Answer

A:

Changes to task definitions and launch paths provide persistence evidence; limiting task registration and alerting on anomalies constrain abuse. The specific weakness being corrected is that scheduled tasks can execute code on triggers or schedules without keeping the original user session alive, making them a possible persistence mechanism.

Incorrect Answers

B:

Central immutable retention and alerts on clearing events preserve an independent timeline and expose suspicious attempts to erase local evidence; that safeguard does not directly close the scheduled-task persistence route highlighted by the test.

C:

Per-account salts defeat precomputed hash tables, while expensive password hashing slows each offline guess after a database leak; the proposed improvement would make sense for offline password hash attack but not as the main fix here; the tested fault instead involves scheduled-task persistence.

D:

Enabling preauthentication removes the unauthenticated response path; strong secrets provide additional resistance if password material is exposed; the specific root cause belongs to scheduled-task persistence, beyond this control's intended scope.

E:

Removing unauthorized trust entries and limiting key enrollment close the bypass that persists when only local passwords are changed; that change targets SSH authorized-key persistence, while the confirmed weakness involves scheduled-task persistence.

F:

Explicit paths, signed code checks where available, and restricted write permissions reduce control over dependencies loaded by privileged applications; it would improve DLL search-order hijacking, not directly correct the reported scheduled-task persistence issue.

Question 544

An incident analyst is asked to classify this observed activity: The authorized scope excludes industrial controllers, but the automated target expansion includes their management network. Which concept is the closest match?

  1. CVSS base score
  2. Scanner credential exposure
  3. Assessment exclusions
  4. Vulnerability validation

Explanation

Correct Answer

C:

A scanner's discovery capability does not change the rules of engagement; unapproved hosts can suffer performance or stability impact from probing. On affected systems, it is useful to apply explicit target allowlists and test exclusions before execution; enforced scope controls keep sensitive or prohibited assets outside the scan regardless of how network ranges are discovered.

Incorrect Answers

A:

CVSS base metrics characterize intrinsic exploitability and impact; local exposure and business consequences are captured separately through context or environmental assessment; the relevant mechanism in the observed workflow is assessment exclusions instead.

B:

Scanning credentials are high-value secrets; tool compromise can turn routine assessment infrastructure into a privileged access path; those effects are not the assessment exclusions pattern evidenced by the assessment.

D:

Vulnerability validation separates heuristic indicators from evidence of the claimed security impact; a response anomaly alone can be caused by ordinary application errors; the observed evidence concerns assessment exclusions instead.

Question 545

In a permitted test environment, the analyst records: A lab switch sees many DHCP discovery messages with different client identifiers, exhausting the server's small lease pool. What is the most precise classification?

  1. Rogue DHCP server
  2. DHCP snooping bindings
  3. MAC address table flooding
  4. DHCP starvation

Explanation

Correct Answer

D:

DHCP starvation consumes address leases by presenting many apparent clients so legitimate machines cannot obtain a normal lease. A practical defensive response is to enable DHCP snooping and rate limits on untrusted access ports; per-port request limits and trusted DHCP server ports reduce lease exhaustion and constrain DHCP-origin abuse at the access layer.

Incorrect Answers

A:

Rogue DHCP replies can provide malicious network settings that redirect subsequent name resolution and traffic even without changing host applications; those effects are not the DHCP starvation pattern evidenced by the assessment.

B:

DHCP snooping establishes trusted DHCP-server direction and binding data used by other access-layer protections such as dynamic ARP inspection; the case demonstrates DHCP starvation rather than the alternate mechanism.

C:

CAM table flooding attempts to exhaust switch learning resources; some switches may flood unknown unicast frames more broadly when entries are unavailable; the observed evidence concerns DHCP starvation instead.

Question 546

The assessment evidence reads as follows: A compromised driver conceals processes from normal operating-system tools while privileged kernel telemetry reveals discrepancies. Which technical concept explains the result?

  1. Compromised software dependency
  2. Kernel rootkit
  3. File-infecting virus
  4. Living-off-the-land misuse
  5. Bootkit compromise

Explanation

Correct Answer

B:

Kernel rootkits modify low-level execution or visibility to hide malicious artifacts, making tools that depend on the compromised OS potentially unreliable. A practical defensive response is to enforce signed drivers and use trusted offline or external inspection; kernel integrity protections reduce unauthorized code loading; independent inspection avoids trusting potentially subverted in-host enumeration.

Incorrect Answers

A:

Software supply-chain compromise abuses trusted dependencies or update paths so the victim runs malicious code as part of an expected installation workflow; the case demonstrates kernel rootkit rather than the alternate mechanism.

C:

A virus attaches itself to another file or executable and commonly depends on host execution to spread, unlike a self-propagating worm; the test record points specifically to kernel rootkit, not this separate mechanism.

D:

Living-off-the-land behavior abuses legitimate operating-system tools to perform malicious work, so executable reputation alone may be insufficient; that behavior is distinct from the kernel rootkit finding being classified.

E:

Bootkits target boot components or the boot chain to persist below ordinary user-space defenses, potentially running before endpoint agents initialize; the scenario identifies kernel rootkit, which has a different triggering condition.

Question 547

The assessor confirmed this exposure: A web directory without an index page displays a generated list of archived database exports to anonymous visitors despite administrators never creating a listing page. Which change most directly closes the underlying security gap?

  1. Canonicalize paths and enforce a fixed document root before file access
  2. Disable directory indexes and protect sensitive files with authorization
  3. Deploy a tested HSTS policy and HTTPS redirects
  4. Mark sensitive responses private or no-store and review cache keys

Explanation

Correct Answer

B:

Blocking auto-generated listings reduces discovery, while actual access restrictions are still needed to keep guessed file URLs private. The technical basis for the recommendation is that directory listing occurs when the web server enumerates entries because an index document is missing and indexing is enabled.

Incorrect Answers

A:

Resolving canonical paths and checking containment prevents encoding tricks from reaching files outside the approved static content tree; its security benefit applies principally to static-file path traversal, not the defect described; the tested fault instead involves directory listing.

C:

HSTS reduces client downgrade risk; its coverage and includeSubDomains settings must reflect actual subdomain TLS readiness; the action is aimed at missing HSTS policy; it leaves the central directory listing condition unresolved.

D:

Correct cache behavior prevents personal content from being reused for unrelated clients even when the backend authorization check was sound; this is relevant to a separate sensitive response caching scenario, rather than the identified exposure; the tested fault instead involves directory listing.

Question 548

A defender analyzing an approved exercise sees this pattern: A malformed input triggers database error text that reveals query structure and schema details in the application's HTTP response. Which mechanism is most consistent with it?

  1. Out-of-band SQL injection
  2. NoSQL operator injection
  3. Error-based SQL injection
  4. Time-based blind SQL injection

Explanation

Correct Answer

C:

Error-based SQL injection extracts information through database-generated errors when untrusted input alters SQL syntax and diagnostics reach the client. On affected systems, it is useful to bind query parameters and suppress detailed database errors in responses; parameterized statements prevent input from changing query structure, while generic external errors avoid exposing schema diagnostics.

Incorrect Answers

A:

Out-of-band SQL injection extracts evidence through a separate network channel, often DNS or HTTP, when direct response content cannot carry query results; the test record points specifically to error-based SQL injection, not this separate mechanism.

B:

NoSQL injection abuses interpretation of structured query operators rather than SQL text syntax; unvalidated input types can alter database predicates; that behavior is distinct from the error-based SQL injection finding being classified.

D:

Time-based blind injection infers a condition through deliberate execution-time differences when application output conceals query results and errors; the defining symptom in the prompt is associated with error-based SQL injection instead.

Question 549

The asset owner wants to stop the verified condition recurring: A device enrolled for high-value financial approvals has been rooted, meaning a third-party process can bypass normal Android privilege restrictions and inspect application data. What is the most targeted improvement?

  1. Enforce managed app sources and mobile threat defense
  2. Restrict risky overlay and accessibility grants and monitor suspicious apps
  3. Use platform keystores and avoid embedding reusable high-value secrets
  4. Use device attestation and restrict access from unsupported rooted endpoints

Explanation

Correct Answer

D:

Integrity checks and conditional access prevent high-trust applications from assuming ordinary platform protections remain intact on modified devices. It directly addresses this mechanism: rooting grants exceptional control over the device and can weaken integrity controls or app isolation relied on by organizational security policies.

Incorrect Answers

A:

Trusted distribution, signature checks, and endpoint policy reduce installation of repackaged applications from uncontrolled sites; the measure addresses a different trust boundary from the rooted Android exposure finding.

B:

Platform safeguards and application controls reduce the ability of one app to draw deceptive credential forms over another; the required correction concerns rooted Android exposure, so this is not the targeted control.

C:

Hardware-backed or OS-protected keys reduce straightforward extraction while server-managed short-lived tokens limit exposure if a client is lost; its security benefit applies principally to insecure mobile key storage, not the defect described; the tested fault instead involves rooted Android exposure.

Question 550

A remediation meeting focuses on the following finding: A company-owned Android handset mixes employee messaging and managed business apps, and the security team needs separable profiles with controlled data sharing between them. Which proposed action best addresses its root cause?

  1. Deploy enterprise work profiles with controlled data-sharing rules
  2. Enforce managed app sources and mobile threat defense
  3. Review requested permissions and block unnecessary sensitive grants
  4. Minimize exported components and enforce permissions for sensitive entry points
  5. Check platform integrity and limit high-risk access from modified devices

Explanation

Correct Answer

A:

Managed-profile restrictions limit casual copying of corporate records into personal apps while retaining separate personal device use. The underlying condition is that an Android work profile partitions managed applications and data from the personal profile, supporting differentiated security policy on BYOD devices.

Incorrect Answers

B:

Trusted distribution, signature checks, and endpoint policy reduce installation of repackaged applications from uncontrolled sites; the tested weakness is Android work profile isolation, not the sideloaded APK risk configuration addressed here.

C:

Feature-based permission review limits unintended data collection and reduces blast radius when an app misbehaves; that safeguard does not directly close the Android work profile isolation route highlighted by the test.

D:

Explicit component exposure and caller checks prevent another application from invoking privileged behavior meant only for internal flows; the proposed improvement would make sense for Android exported component but not as the main fix here; the tested fault instead involves Android work profile isolation.

E:

Device posture controls keep sensitive services from relying on security guarantees a jailbroken host may no longer provide; the specific root cause belongs to Android work profile isolation, beyond this control's intended scope.

Certified Ethical Hacker v13 (312-50v13) Practice Tests