312-50V13 PDF & RELIABLE 312-50V13 EXAM VOUCHER

312-50v13 PDF & Reliable 312-50v13 Exam Voucher

312-50v13 PDF & Reliable 312-50v13 Exam Voucher

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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q252-Q257):

NEW QUESTION # 252
Session splicing is an IDS evasion technique in which an attacker delivers data in multiple, small sized packets to the target computer, making it very difficult for an IDS to detect the attack signatures. Which tool can be used to perform session splicing attacks?

  • A. Whisker
  • B. tcpsplice
  • C. Burp
  • D. Hydra

Answer: A

Explanation:
Many IDS reassemble communication streams; hence, if a packet is not received within a reasonable period, many IDS stop reassembling and handling that stream. If the application under attack keeps a session active for a longer time than that spent by the IDS on reassembling it, the IDS will stop. As a result, any session after the IDS stops reassembling the sessions will be susceptible to malicious data theft by attackers. The IDS will not log any attack attempt after a successful splicing attack. Attackers can use tools such as Nessus for session splicing attacks.
Did you know that the EC-Council exam shows how well you know their official book? So, there is no
"Whisker" in it. In the chapter "Evading IDS" -> "Session Splicing", the recommended tool for performing a session-splicing attack is Nessus. Where Wisker came from is not entirely clear, but I will assume the author of the question found it while copying Wikipedia.
https://en.wikipedia.org/wiki/Intrusion_detection_system_evasion_techniques
One basic technique is to split the attack payload into multiple small packets so that the IDS must reassemble the packet stream to detect the attack. A simple way of splitting packets is by fragmenting them, but an adversary can also simply craft packets with small payloads. The 'whisker' evasion tool calls crafting packets with small payloads 'session splicing'.
By itself, small packets will not evade any IDS that reassembles packet streams. However, small packets can be further modified in order to complicate reassembly and detection. One evasion technique is to pause between sending parts of the attack, hoping that the IDS will time out before the target computer does. A second evasion technique is to send the packets out of order, confusing simple packet re-assemblers but not the target computer.
NOTE: Yes, I found scraps of information about the tool that existed in 2012, but I can not give you unverified information. According to the official tutorials, the correct answer is Nessus, but if you know anything about Wisker, please write in the QA section. Maybe this question will be updated soon, but I'm not sure about that.


NEW QUESTION # 253
A security analyst is investigating a potential network-level session hijacking incident. During the investigation, the analyst finds that the attacker has been using a technique in which they injected an authentic- looking reset packet using a spoofed source IP address and a guessed acknowledgment number. As a result, the victim's connection was reset. Which of the following hijacking techniques has the attacker most likely used?

  • A. TCP/IP hijacking
  • B. UDP hijacking
  • C. Blind hijacking
  • D. RST hijacking

Answer: D

Explanation:
The attacker has most likely used RST hijacking, which is a type of network-level session hijacking technique that exploits the TCP reset (RST) mechanism. TCP reset is a way of terminating an established TCP connection by sending a packet with the RST flag set, indicating that the sender does not want to continue the communication. RST hijacking involves sending a forged RST packet to one or both ends of a TCP connection, using a spoofed source IP address and a guessed acknowledgment number, to trick them into believing that the other end has closed the connection. As a result, the victim's connection is reset and the attacker can take over the session or launch a denial-of-service attack12.
The other options are not correct for the following reasons:
* A. TCP/IP hijacking: This option is a general term that refers to any type of network-level session hijacking technique that targets TCP/IP connections. RST hijacking is a specific type of TCP/IP hijacking, but not the only one. Other types of TCP/IP hijacking include SYN hijacking, source routing, and sequence prediction3.
* B. UDP hijacking: This option is not applicable because UDP is a connectionless protocol that does not use TCP reset mechanism. UDP hijacking is a type of network-level session hijacking technique that targets UDP connections, such as DNS or VoIP. UDP hijacking involves intercepting and modifying UDP packets to redirect or manipulate the communication between the sender and the receiver4.
* D. Blind hijacking: This option is not accurate because blind hijacking is a type of network-level session hijacking technique that does not require injecting RST packets. Blind hijacking involves guessing the sequence and acknowledgment numbers of a TCP connection without being able to see the responses from the target. Blind hijacking can be used to inject malicious data or commands into an active TCP session, but not to reset the connection5.
References:
* 1: RST Hijacking - an overview | ScienceDirect Topics
* 2: TCP Reset Attack - an overview | ScienceDirect Topics
* 3: TCP/IP Hijacking - an overview | ScienceDirect Topics
* 4: UDP Hijacking - an overview | ScienceDirect Topics
* 5: Blind Hijacking - an overview | ScienceDirect Topics


NEW QUESTION # 254
John, a security analyst working for an organization, found a critical vulnerability on the organization's LAN that allows him to view financial and personal information about the rest of the employees. Before reporting the vulnerability, he examines the information shown by the vulnerability for two days without disclosing any information to third parties or other internal employees. He does so out of curiosity about the other employees and may take advantage of this information later. What would John be considered as?

  • A. White hat
  • B. Gray hat
  • C. Cybercriminal
  • D. Black hat

Answer: B


NEW QUESTION # 255
Firewalls are the software or hardware systems that are able to control and monitor the traffic coming in and out the target network based on pre-defined set of rules. Which of the following types of firewalls can protect against SQL injection attacks?

  • A. Packet firewall
  • B. Stateful firewall
  • C. Web application firewall
  • D. Data-driven firewall

Answer: C

Explanation:
https://en.wikipedia.org/wiki/Web_application_firewall
A web application firewall (WAF) is a specific form of application firewall that filters, monitors, and blocks HTTP traffic to and from a web service. By inspecting HTTP traffic, it can prevent attacks exploiting a web application's known vulnerabilities, such as SQL injection, cross-site scripting (XSS), file inclusion, and improper system configuration.


NEW QUESTION # 256
Bob received this text message on his mobile phone: "Hello, this is Scott Smelby from the Yahoo Bank.
Kindly contact me for a vital transaction on: scottsmelby@yahoo.com". Which statement below is true?

  • A. This is a scam as everybody can get a @yahoo address, not the Yahoo customer service employees.
  • B. Bob should write to scottmelby@yahoo.com to verify the identity of Scott.
  • C. This is probably a legitimate message as it comes from a respectable organization.
  • D. This is a scam because Bob does not know Scott.

Answer: A


NEW QUESTION # 257
......

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