ECCouncil 312-50v13 (Certified Ethical Hacker v13) Practice Test 42

Question 410

The assessment evidence reads as follows: Multiple clients lose connectivity as a nearby emitter raises noise across the channel, even though authentication and encryption remain correctly configured. Which technical concept explains the result?

  1. Bluetooth pairing downgrade
  2. Evil-twin access point
  3. Wireless jamming
  4. Hidden SSID misconception

Explanation

Correct Answer

C:

RF jamming disrupts availability at the physical layer; stronger cryptographic keys do not eliminate interference in the shared radio spectrum. For a production safeguard, operators can use spectrum monitoring and resilient channel or coverage planning; RF monitoring identifies interference patterns and alternative coverage or channels restore service without misdiagnosing the outage as a password issue.

Incorrect Answers

A:

Bluetooth pairing methods have different authentication guarantees; Just Works pairing can lack MITM resistance in situations requiring verified peer identity; those prerequisites differ from the wireless jamming behavior in the record.

B:

An evil twin imitates a legitimate wireless network's identity to intercept associations or lead clients into fraudulent authentication and traffic paths; this would classify another type of evidence, whereas the actual finding shows wireless jamming.

D:

A hidden SSID is not cryptographic protection; association traffic and other wireless management exchanges can still reveal network identifiers; those effects are not the wireless jamming pattern evidenced by the assessment.

Question 411

A security engineer examines the following result: A shared web IP returns different sites according to the Host header, and an unknown hostname unexpectedly reaches an administrative virtual host. Which described weakness or technique does it demonstrate?

  1. Server version header
  2. Name-based virtual hosting
  3. Missing HSTS policy
  4. Sensitive response caching

Explanation

Correct Answer

B:

Name-based virtual hosting routes requests using HTTP host identity, which may differ from the socket's IP address or default site. On affected systems, it is useful to set a safe default virtual host and validate expected hostnames; explicit host routing prevents arbitrary names from reaching sensitive virtual hosts or generating unsafe absolute links.

Incorrect Answers

A:

Response headers can reveal software identifiers that help attackers compare a host with known vulnerabilities; disclosure is not exploitation by itself; this would classify another type of evidence, whereas the actual finding shows name-based virtual hosting.

C:

HTTP Strict Transport Security tells compliant browsers to use HTTPS for subsequent requests to covered hosts after receiving the policy securely; those effects are not the name-based virtual hosting pattern evidenced by the assessment.

D:

Incorrect HTTP caching directives or cache keys can mix authenticated responses across users when intermediaries ignore session-specific variation; the case demonstrates name-based virtual hosting rather than the alternate mechanism.

Question 412

The assessor confirmed this exposure: A UDP check produces no response from a service that silently drops malformed requests, so the assessor is about to label the port closed without protocol-specific verification. Which change most directly closes the underlying security gap?

  1. Reduce authorized probe rates and correlate results with perimeter logs
  2. Validate ambiguous UDP results with protocol-aware requests
  3. Validate port findings from the relevant network segment and check ACLs
  4. Use scoped ICMP policies rather than assuming ping silence means absence
  5. Use layered scan detection and verify FIN findings with ordinary service probes

Explanation

Correct Answer

B:

Application-specific probes and correlated firewall logs help distinguish a silent UDP listener from network filtering without guessing from silence. It targets the actual failure mode: a UDP scan often cannot distinguish open from filtered ports when no response arrives; ICMP port-unreachable usually indicates the probed port is closed.

Incorrect Answers

A:

Controlled timing improves reproducibility and avoids mistaking defensive drops or transient congestion for a change in service configuration; it would improve rate-limited scan results, not directly correct the reported UDP service discovery issue.

C:

Reachability is path-dependent; comparing internal and external probes with firewall policy distinguishes a closed service from a blocked route; the required correction concerns UDP service discovery, so this is not the targeted control.

D:

Restricting unnecessary echo response can reduce mapping, but asset discovery still needs multiple signals because hosts may silently drop ICMP; its security benefit applies principally to ICMP echo discovery, not the defect described; the tested fault instead involves UDP service discovery.

E:

Anomaly telemetry can flag unusual TCP flags, and corroborating normal connection behavior prevents treating silent responses as proof of openness; the exposure here is UDP service discovery, which calls for another protective mechanism.

Question 413

A defender analyzing an approved exercise sees this pattern: An unauthorized caller claims to be a traveling employee who lost their phone and requests removal of all authentication factors. Which mechanism is most consistent with it?

  1. Vishing
  2. Pretexting
  3. Whaling
  4. Help-desk reset impersonation

Explanation

Correct Answer

D:

Help-desk social engineering exploits recovery and support workflows, where urgency or sympathy can trigger high-impact identity changes. For a production safeguard, operators can use strong account-recovery proof and second-party review for factor resets; recovery protections keep an impersonator from taking over the account simply by persuading support to replace or disable authentication controls.

Incorrect Answers

A:

Vishing uses voice calls to deceive a person into disclosing secrets or performing unsafe actions, often relying on caller-ID spoofing and urgency; those effects are not the help-desk reset impersonation pattern evidenced by the assessment.

B:

Pretexting creates a believable false scenario or role to obtain information or a policy exception, rather than exploiting a software flaw; the case demonstrates help-desk reset impersonation rather than the alternate mechanism.

C:

Whaling focuses social engineering on senior or high-value leaders whose authority and access make a successful deception especially consequential; the observed evidence concerns help-desk reset impersonation instead.

Question 414

A security engineer examines the following result: A request to a static-file directory returns an automatically generated index showing backup archives and application files. Which described weakness or technique does it demonstrate?

  1. HTTP request smuggling
  2. Static-file path traversal
  3. Invalid certificate chain
  4. Directory listing

Explanation

Correct Answer

D:

Directory listing occurs when the web server enumerates entries because an index document is missing and indexing is enabled. A targeted mitigation is to disable directory indexes and protect sensitive files with authorization; blocking auto-generated listings reduces discovery, while actual access restrictions are still needed to keep guessed file URLs private.

Incorrect Answers

A:

Request smuggling arises from inconsistent HTTP message framing between intermediaries, notably conflicting length or transfer-encoding interpretation; the case demonstrates directory listing rather than the alternate mechanism.

B:

Path traversal results from unsafe path normalization or file resolution, letting attacker-controlled relative segments escape an intended filesystem root; the observed evidence concerns directory listing instead.

C:

TLS certificate chain validation requires a verifiable route from the presented certificate through intermediates to a trusted root; the test record points specifically to directory listing, not this separate mechanism.

Question 415

A security engineer examines the following result: A victim receives unwanted replies from many third-party systems, but each response is approximately the same size as its triggering request. Which described weakness or technique does it demonstrate?

  1. DNS amplification
  2. Memcached reflection
  3. Botnet distributed attack
  4. Reflection without amplification

Explanation

Correct Answer

D:

Reflection redirects response traffic to a spoofed victim by exploiting unauthenticated protocols; amplification additionally requires a favorable response-size ratio. A targeted mitigation is to implement anti-spoofing filtering at source networks; source-validation filters block forged victim addresses that make reflection possible, regardless of whether the protocol magnifies packet size.

Incorrect Answers

A:

DNS amplification combines forged-source requests with responders that produce much larger replies; open resolvers can be abused as reflectors; the observed evidence concerns reflection without amplification instead.

B:

Unauthenticated UDP memcached exposure has enabled high-amplification reflection when forged-source requests trigger responses far larger than the queries; the test record points specifically to reflection without amplification, not this separate mechanism.

C:

A botnet coordinates many controlled endpoints, distributing sources so simple single-IP throttles may fail to stop aggregate overload; that behavior is distinct from the reflection without amplification finding being classified.

Question 416

The tester submits the following verified finding: A service's upstream link saturates with high-rate UDP datagrams aimed at random application ports and little meaningful payload exchange. Which technique or condition is involved?

  1. UDP packet flood
  2. HTTP application flood
  3. ICMP flood
  4. Upstream traffic scrubbing

Explanation

Correct Answer

A:

UDP flooding consumes bandwidth and packet-processing capacity without requiring an established connection; the impact can occur before an application responds. A practical defensive response is to use upstream filtering and volumetric DDoS mitigation; provider-level controls drop unwanted volume before the limited access link becomes saturated, unlike an application-only request throttle.

Incorrect Answers

B:

Application-layer floods exhaust request handlers, backends, or expensive application operations rather than relying exclusively on raw packet volume; that behavior is distinct from the UDP packet flood finding being classified.

C:

An ICMP flood targets network processing or bandwidth using large volumes of diagnostic packets rather than exhausting an HTTP application; the scenario identifies UDP packet flood, which has a different triggering condition.

D:

Cloud or provider scrubbing diverts and filters high-volume attack traffic upstream, where greater capacity exists to absorb the flood; the defining symptom in the prompt is associated with UDP packet flood instead.

Question 417

The approved test uncovered this weakness: A network prevention gateway blocks suspicious payloads while they pass through its inline interfaces, and its location must be chosen so it actually sees protected traffic. Which control would reduce the relevant exposure without relying on obscurity?

  1. Isolate decoys and prevent their use as a pivot into production
  2. Place IPS at protected chokepoints with tuned blocking policies
  3. Normalize fragments and match sensor reassembly behavior to endpoints
  4. Use default-deny inbound policies with state tracking and explicit exceptions

Explanation

Correct Answer

B:

Inline placement lets signatures or behavior rules prevent delivery, but testing is necessary to avoid blocking legitimate applications. The underlying condition is that an inline IPS can block or reset traffic on the path while applying detection logic; availability design must consider false positives and bypass behavior.

Incorrect Answers

A:

Containment ensures that an attacker who compromises a decoy cannot use its network access to reach operational services; the measure addresses a different trust boundary from the inline network IPS finding.

C:

Consistent stream reconstruction prevents an attacker from hiding payload bytes in packet divisions that only the protected host interprets; its security benefit applies principally to IP fragmentation evasion, not the defect described; the tested fault instead involves inline network IPS.

D:

Session-aware filtering allows expected responses without opening general inbound reachability to unrelated external clients; the exposure here is inline network IPS, which calls for another protective mechanism.

Question 418

The tester submits the following verified finding: An infected device attempts to resolve hundreds of algorithmically patterned domains, only a small fraction of which exist. Which technique or condition is involved?

  1. Self-replicating worm
  2. File-infecting virus
  3. Domain generation algorithm
  4. Command-and-control beacon

Explanation

Correct Answer

C:

A domain generation algorithm produces changing candidate rendezvous names so blocking a single command-and-control domain is less effective. On affected systems, it is useful to correlate high-volume failed DNS queries and apply protective DNS; unusual query distributions and known algorithmic patterns help detect rotating rendezvous attempts before a successful connection.

Incorrect Answers

A:

A worm propagates itself through reachable systems or vulnerabilities without requiring each victim to execute a host document manually; the scenario identifies domain generation algorithm, which has a different triggering condition.

B:

A virus attaches itself to another file or executable and commonly depends on host execution to spread, unlike a self-propagating worm; the defining symptom in the prompt is associated with domain generation algorithm instead.

D:

Beaconing is periodic communication to a command-and-control service; stable intervals and destinations may indicate task polling or status reporting; the reported conditions are characteristic of domain generation algorithm, not that path.

Question 419

An incident analyst is asked to classify this observed activity: Two servers share an identical CVE, but one is exposed to untrusted users and the other is isolated behind a management boundary. Which concept is the closest match?

  1. Remediation retest
  2. Authenticated vulnerability scan
  3. Risk-based patch prioritization
  4. CVE identifier

Explanation

Correct Answer

C:

Exposure and exploit conditions influence practical risk even when the underlying vulnerability ID and published severity match. For a production safeguard, operators can remediate reachable high-impact instances first while tracking both; risk-based sequencing addresses likely exploitation paths without treating lower-exposure hosts as permanently exempt from remediation.

Incorrect Answers

A:

Remediation status is not equivalent to demonstrated vulnerability removal; deployment failures, missed nodes, or compensating paths can leave exposure; the defining symptom in the prompt is associated with risk-based patch prioritization instead.

B:

Credentialed scanning examines installed versions, configurations, and local patch state; network-only checks may miss software with no exposed banner; the events given do not establish this behavior but do support risk-based patch prioritization.

D:

A CVE is a standardized identifier for a disclosed vulnerability; it is not itself a severity score, exploit proof, or patch confirmation; those prerequisites differ from the risk-based patch prioritization behavior in the record.

Question 420

A remediation meeting focuses on the following finding: A file-download endpoint decodes encoded dot segments after a superficial path check, allowing requested names to escape the intended static-content tree. Which proposed action best addresses its root cause?

  1. Separate writable data from code and run the worker with minimal rights
  2. Mark sensitive responses private or no-store and review cache keys
  3. Remove sample applications and harden the deployed server baseline
  4. Canonicalize paths and enforce a fixed document root before file access

Explanation

Correct Answer

D:

Resolving canonical paths and checking containment prevents encoding tricks from reaching files outside the approved static content tree. The technical basis for the recommendation is that path traversal results from unsafe path normalization or file resolution, letting attacker-controlled relative segments escape an intended filesystem root.

Incorrect Answers

A:

Read-only deployment paths and distinct service permissions reduce the impact of a web process compromise; the exposure here is static-file path traversal, which calls for another protective mechanism.

B:

Correct cache behavior prevents personal content from being reused for unrelated clients even when the backend authorization check was sound; the action is aimed at sensitive response caching; it leaves the central static-file path traversal condition unresolved.

C:

Eliminating unneeded components reduces exposed code paths instead of relying on the absence of links to hidden demo content; this is relevant to a separate default web content scenario, rather than the identified exposure; the tested fault instead involves static-file path traversal.

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