ECCouncil 312-50v13 (Certified Ethical Hacker v13) Practice Test 46

Question 450

The testing team seeks a specific preventive recommendation for this finding: The initial unauthenticated scan shows no local patch state for critical Windows servers, and the assessor needs a reliable inventory without assigning the scanner unrestricted domain authority. What should be implemented?

  1. Use a minimal authorized reproduction and collect corroborating logs
  2. Remediate reachable high-impact instances first while tracking both
  3. Correct hardening drift and retest benchmark controls
  4. Provide tightly scoped scanner credentials and rotate them after use

Explanation

Correct Answer

D:

A controlled identity improves coverage while limiting the impact if stored assessment credentials are leaked or misused. That correction is linked to the fact that credentialed scanning examines installed versions, configurations, and local patch state; network-only checks may miss software with no exposed banner.

Incorrect Answers

A:

Controlled evidence establishes the vulnerable path and limits false claims while keeping the proof within approved testing boundaries; the specific root cause belongs to authenticated vulnerability scan, beyond this control's intended scope.

B:

Risk-based sequencing addresses likely exploitation paths without treating lower-exposure hosts as permanently exempt from remediation; that change targets risk-based patch prioritization, while the confirmed weakness involves authenticated vulnerability scan.

C:

Turning off unnecessary services and tightening audit policies addresses exposure that patch installation alone cannot remove; it would improve configuration benchmark assessment, not directly correct the reported authenticated vulnerability scan issue.

Question 451

A defender analyzing an approved exercise sees this pattern: An employee gets a telephone call from someone claiming to be IT support and is persuaded to reveal an account recovery code. Which mechanism is most consistent with it?

  1. Tailgating
  2. Vishing
  3. Help-desk reset impersonation
  4. Quid-pro-quo scam

Explanation

Correct Answer

B:

Vishing uses voice calls to deceive a person into disclosing secrets or performing unsafe actions, often relying on caller-ID spoofing and urgency. For a production safeguard, operators can train staff to end unsolicited calls and call back through official support numbers; independent dial-back prevents a caller's claimed identity and spoofable phone number from authorizing sensitive account actions.

Incorrect Answers

A:

Tailgating gains physical access by following someone legitimately admitted, exploiting social pressure to hold doors instead of defeating badge technology; the observed evidence concerns vishing instead.

C:

Help-desk social engineering exploits recovery and support workflows, where urgency or sympathy can trigger high-impact identity changes; that behavior is distinct from the vishing finding being classified.

D:

Quid pro quo uses a promised benefit or service in exchange for an action that grants access or discloses information; the scenario identifies vishing, which has a different triggering condition.

Question 452

A follow-up review must reduce the risk revealed here: A test report combines results from a standard sales account and a network topology supplied by the customer but does not disclose the assumed privileges or the partial information provided. Which defensive measure fits the specific failure mode?

  1. Reconcile source review with runtime verification of discovered flaws
  2. Separate passive discovery from approved active validation
  3. Prioritize findings using asset criticality and exploitability context
  4. Keep the provided role and assumptions explicit in the test plan

Explanation

Correct Answer

D:

Documented credentials and partial knowledge distinguish what was directly assessed from privileged paths that remain outside the test vantage point. The specific weakness being corrected is that gray-box testing combines partial internal knowledge with constrained access; it helps examine authorization boundaries while retaining a realistic nonadministrative perspective.

Incorrect Answers

A:

Knowing the code does not itself demonstrate exploitability in the deployed configuration; validated runtime behavior makes the finding dependable; that safeguard does not directly close the gray-box assessment route highlighted by the test.

B:

Recording passive findings first avoids assuming public references are in scope and lets the team request explicit approval before contacting an asset; the proposed improvement would make sense for passive reconnaissance but not as the main fix here; the tested fault instead involves gray-box assessment.

C:

Business impact and reachable attack paths change expected loss, so remediation scheduling should not be based solely on the generic vulnerability score; the specific root cause belongs to gray-box assessment, beyond this control's intended scope.

Question 453

The assessment evidence reads as follows: A Unix-like server's mount service publishes an export list that includes a sensitive shared directory. Which technical concept explains the result?

  1. SMB null-session exposure
  2. NFS export disclosure
  3. DNS SRV discovery
  4. BGP neighbor disclosure

Explanation

Correct Answer

B:

NFS exports describe filesystems available to network clients; export policies can expose directories even when the server's local permissions appear sound. For a production safeguard, operators can constrain NFS exports to intended clients with least-privilege mappings; host restrictions, secure versions, and root squashing where appropriate reduce remote mounting and privilege-mapping abuse.

Incorrect Answers

A:

An SMB null session may expose information on misconfigured or older systems where anonymous access policy is overly permissive; that behavior is distinct from the NFS export disclosure finding being classified.

C:

DNS SRV records publish the hostname and port of a service so clients can find it; LDAP and Kerberos discovery commonly rely on them; the defining symptom in the prompt is associated with NFS export disclosure instead.

D:

BGP peer and route information can expose network topology and transit relationships, but route visibility does not confer access to router control functions; the events given do not establish this behavior but do support NFS export disclosure.

Question 454

The assessment evidence reads as follows: An access point uses a password-authenticated exchange designed to resist straightforward offline dictionary testing from a passive handshake capture. Which technical concept explains the result?

  1. WPA2-Personal weak passphrase
  2. Evil-twin access point
  3. WPA3-SAE authentication
  4. KRACK handshake implementation

Explanation

Correct Answer

C:

WPA3-Personal uses SAE rather than the WPA2-Personal PSK handshake, improving resistance to passive offline password guessing under proper implementation. On affected systems, it is useful to enable WPA3-SAE and current firmware without unsafe transition settings; modern authentication strengthens password exchange, while configuration and software updates address downgrade and implementation risks.

Incorrect Answers

A:

WPA2-Personal derives key material from a shared passphrase, so weak secrets can be tested against a captured handshake outside the network; the scenario identifies WPA3-SAE authentication, which has a different triggering condition.

B:

An evil twin imitates a legitimate wireless network's identity to intercept associations or lead clients into fraudulent authentication and traffic paths; the defining symptom in the prompt is associated with WPA3-SAE authentication instead.

D:

Key reinstallation attacks exploit certain four-way-handshake implementation flaws, not the mere existence of a strong WPA2 passphrase; the reported conditions are characteristic of WPA3-SAE authentication, not that path.

Question 455

Investigators compare two verified findings. First: In an authorized test, a DNS name found through predictable host prefixes resolves to an asset not listed in the initial application inventory. Second: An employee's public professional profile identifies the organization's planned endpoint-protection replacement and the team's internal responsibilities before the security group publishes an announcement. Select TWO mechanisms directly represented here.

  1. Certificate transparency discovery
  2. Social media role intelligence
  3. Passive DNS history
  4. Reverse DNS footprinting
  5. Subdomain wordlist discovery

Explanation

Correct Answers

B:

Open social and job-posting content can reveal technologies, internal terminology, suppliers, and personnel roles useful in targeted reconnaissance; it is separately evidenced in the task, rather than being interchangeable with subdomain wordlist discovery.

E:

Subdomain enumeration combines naming patterns and DNS responses to uncover assets that organizational web navigation may not mention; this technical behavior accounts for the subdomain wordlist discovery observation, while social media role intelligence concerns the other independent evidence.

Incorrect Answers

A:

Certificate transparency logs are public issuance records; hostnames in certificate subject alternative names may reveal externally relevant assets without probing the hosts; the defining symptom in the prompt is associated with subdomain wordlist discovery, social media role intelligence instead.

C:

Passive DNS datasets collect historical name-to-address observations and can expose forgotten host relationships and potential dangling dependencies; the reported conditions are characteristic of subdomain wordlist discovery, social media role intelligence, not that path.

D:

Reverse DNS uses PTR records to map an address back to a hostname; descriptive PTR values can inadvertently reveal infrastructure purpose; those prerequisites differ from the subdomain wordlist discovery, social media role intelligence behavior in the record.

Question 456

The approved test uncovered this weakness: A researcher compiles employee technology mentions from conference slides; a colleague proposes probing every named endpoint before checking whether those resources belong to the agreed test scope. Which control would reduce the relevant exposure without relying on obscurity?

  1. Keep the provided role and assumptions explicit in the test plan
  2. Layer MFA, authorization boundaries, monitoring, and network segmentation
  3. Use tamper-evident logs and tightly scoped write privileges
  4. Require manual confirmation and a reproducible proof before reporting impact
  5. Separate passive discovery from approved active validation

Explanation

Correct Answer

E:

Recording passive findings first avoids assuming public references are in scope and lets the team request explicit approval before contacting an asset. This matters for the observed attack path because passive reconnaissance derives intelligence from existing third-party or public sources rather than probing the target systems directly; it can reveal assets without generating target-side scan traffic.

Incorrect Answers

A:

Documented credentials and partial knowledge distinguish what was directly assessed from privileged paths that remain outside the test vantage point; the exposure here is passive reconnaissance, which calls for another protective mechanism.

B:

Independent controls constrain credential misuse, limit lateral exposure, and generate alerts even when endpoint protection or one authentication factor is bypassed; the action is aimed at defense in depth; it leaves the central passive reconnaissance condition unresolved.

C:

Integrity controls make unauthorized modification harder and expose alterations through protected audit trails or cryptographic verification of record changes; this is relevant to a separate integrity scenario, rather than the identified exposure; the tested fault instead involves passive reconnaissance.

D:

Validation against actual endpoint behavior separates credible vulnerability findings from model assertions and avoids overstating an unverified exploit claim; the tested weakness is passive reconnaissance, not the AI-assisted finding verification configuration addressed here.

Question 457

The owner asks for a durable safeguard against the issue demonstrated here: An inventory app asks for continuous microphone and SMS access even though its intended workflow only involves taking occasional product barcode photographs. What is the best response?

  1. Use platform keystores and avoid embedding reusable high-value secrets
  2. Minimize exported components and enforce permissions for sensitive entry points
  3. Review requested permissions and block unnecessary sensitive grants
  4. Enforce managed app sources and mobile threat defense

Explanation

Correct Answer

C:

Feature-based permission review limits unintended data collection and reduces blast radius when an app misbehaves. The specific weakness being corrected is that overprivileged mobile apps expand the information available after compromise or abuse; the platform permission model should track actual features.

Incorrect Answers

A:

Hardware-backed or OS-protected keys reduce straightforward extraction while server-managed short-lived tokens limit exposure if a client is lost; the proposed improvement would make sense for insecure mobile key storage but not as the main fix here; the tested fault instead involves excessive mobile permissions.

B:

Explicit component exposure and caller checks prevent another application from invoking privileged behavior meant only for internal flows; the specific root cause belongs to excessive mobile permissions, beyond this control's intended scope.

D:

Trusted distribution, signature checks, and endpoint policy reduce installation of repackaged applications from uncontrolled sites; it would improve sideloaded APK risk, not directly correct the reported excessive mobile permissions issue.

Question 458

Three separate observations were captured in an authorized exercise. First: Two hosts begin associating the default gateway's IPv4 address with an unfamiliar MAC after unsolicited ARP replies arrive. Second: A switched campus network mishandles native-VLAN 802.1Q encapsulation, permitting an Ethernet frame with two nested tags to reach a segment its source access port should not access. Third: A packet trace shows a workstation adopting a malicious IPv6 gateway shortly after an unapproved laptop emits high-priority router advertisement messages on the access network. Which THREE mechanisms account for these findings? Choose THREE.

  1. SPAN mirror-port collection
  2. VLAN double-tagging attempt
  3. IPv6 router-advertisement spoofing
  4. ARP cache poisoning
  5. Rogue DHCP server
  6. LLMNR name-resolution poisoning

Explanation

Correct Answers

B:

Double-tagging abuses VLAN tag handling and native VLAN behavior across trunks; exploitation depends on specific topology and tagging configuration; this technical behavior accounts for the VLAN double-tagging attempt observation, while ARP cache poisoning, IPv6 router-advertisement spoofing concerns the other independent evidence.

C:

IPv6 router advertisements can configure host routing automatically; fake advertisements may redirect IPv6 traffic even in primarily IPv4-managed networks; it is separately evidenced in the task, rather than being interchangeable with ARP cache poisoning, VLAN double-tagging attempt.

D:

ARP poisoning forges address-resolution associations on a local broadcast domain, potentially redirecting or intercepting traffic through an adversary-controlled interface; its indicators are tied to the ARP cache poisoning record, not to the finding involving VLAN double-tagging attempt, IPv6 router-advertisement spoofing.

Incorrect Answers

A:

Switch port mirroring delivers copies of specified traffic to an analyzer without placing it inline in the production forwarding path; those prerequisites differ from the ARP cache poisoning, VLAN double-tagging attempt, IPv6 router-advertisement spoofing behavior in the record.

E:

Rogue DHCP replies can provide malicious network settings that redirect subsequent name resolution and traffic even without changing host applications; the case demonstrates ARP cache poisoning, VLAN double-tagging attempt, IPv6 router-advertisement spoofing rather than the alternate mechanism.

F:

Link-Local Multicast Name Resolution can resolve names on the local segment without ordinary DNS; spoofed responses can redirect clients to hostile listeners; the observed evidence concerns ARP cache poisoning, VLAN double-tagging attempt, IPv6 router-advertisement spoofing instead.

Question 459

The assessor must classify two separate observations: The packet capture shows TCP probes with no control flags set, followed by inconsistent responses from different operating systems. In another test, a port scan alternates between reachable and unresponsive results as a security appliance begins throttling connection attempts from the assessment address, despite no service restart. Select TWO technical concepts that correspond to these observations.

  1. TCP NULL scan
  2. UDP service discovery
  3. TCP Xmas scan
  4. TCP FIN scan
  5. Rate-limited scan results

Explanation

Correct Answers

A:

NULL scanning sends a zero-flag TCP segment and infers states from implementation-dependent responses; it is not a universally reliable port test; this technical behavior accounts for the TCP NULL scan observation, while rate-limited scan results concerns the other independent evidence.

E:

Scan rate and retransmission timing influence responses when devices enforce thresholds; an apparent missing port may be a rate-limit artifact; this technical behavior accounts for the rate-limited scan results observation, while TCP NULL scan concerns the other independent evidence.

Incorrect Answers

B:

A UDP scan often cannot distinguish open from filtered ports when no response arrives; ICMP port-unreachable usually indicates the probed port is closed; the relevant mechanism in the observed workflow is TCP NULL scan, rate-limited scan results instead.

C:

Xmas scanning uses an unusual TCP flag combination and depends on stack-specific RFC behavior; many platforms do not respond as classic diagrams suggest; those effects are not the TCP NULL scan, rate-limited scan results pattern evidenced by the assessment.

D:

FIN scans use atypical flag combinations and rely on TCP behavior; operating system differences and filtering can make results unreliable; the case demonstrates TCP NULL scan, rate-limited scan results rather than the alternate mechanism.

Question 460

Operations asks for a practical correction after the test found: A file server suddenly generates mass rename-and-write operations with altered encrypted content across shared directories, and recovery teams discover that online backups were also accessible. What should the security team recommend?

  1. Keep isolated immutable backups and restrict bulk file-write privileges
  2. Limit untrusted extensions and investigate unauthorized collection processes
  3. Use integrity monitoring and execution controls on trusted binaries
  4. Maintain tested YARA rules and validate matches against behavior

Explanation

Correct Answer

A:

Recoverable backup copies and limited write access reduce operational leverage even if an endpoint successfully encrypts its reachable files. The technical basis for the recommendation is that ransomware denies access to data, commonly through encryption, to pressure victims into paying; network share reachability can extend damage.

Incorrect Answers

B:

Browser and endpoint controls reduce hidden collection channels, while network egress monitoring can identify telemetry sent to unapproved destinations; the measure addresses a different trust boundary from the ransomware encryption activity finding.

C:

File verification and controlled execution help identify infected hosts and interrupt propagation through modified application files; the required correction concerns ransomware encryption activity, so this is not the targeted control.

D:

Quality rule design and triage reduce false positives and let analysts detect related artifacts even when their full-file hashes differ; its security benefit applies principally to YARA rule matching, not the defect described; the tested fault instead involves ransomware encryption activity.

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