CEH Quiz (101-200) Take This Quiz

In a denial-of-service attack, a hacker intentionally disrupts the availability of a service by overwhelming it with a flood of illegitimate requests or by exploiting vulnerabilities in the system. This prevents legitimate users from accessing the service, causing it to become unavailable or slow down significantly. The hacker may use various techniques such as sending a large volume of traffic, exploiting software vulnerabilities, or conducting a distributed attack using multiple compromised devices. The goal is to exhaust the resources of the targeted service, making it unable to respond to legitimate requests.

Social Engineering is the act of manipulating and deceiving individuals to gain access to sensitive information or systems, rather than using technical methods to breach security. It involves exploiting human psychology and trust to trick people into revealing confidential information or performing actions that may compromise security. This can be done through various techniques such as phishing, pretexting, or impersonation.

The correct answer is Remote Access Trojan (RAT). A RAT is a type of malware that allows an attacker to remotely control a victim's computer. In this scenario, William's computer has been infected with a RAT after installing the Chess game. This explains why his machine has started to slow down and why he sees the RAT program running in his Task Manager. The RAT is likely responsible for the decrease in performance and may also be compromising William's privacy and security by allowing the attacker to access and control his computer remotely.

OS fingerprinting is a method used to determine the operating system and version running on a remote target system. This technique involves analyzing network packets or responses from the target system to identify specific characteristics or behaviors that are unique to different operating systems. By analyzing these fingerprints, security professionals can gain valuable information about the target system, which can be used for vulnerability assessment or penetration testing purposes.

The destination MAC address of a broadcast frame is 0xFFFFFFFFFFFF. In Ethernet, a broadcast frame is sent to all devices on the network, so the destination MAC address is set to the broadcast address, which is represented by all Fs in hexadecimal notation.

The Archive.org website is known for its Wayback Machine feature, which allows users to view archived versions of websites from the past. By visiting the Archive.org website, you can access the Internet archive of the company's website and retrieve the information that was previously listed, including the staff directory and contact information. This can be a useful method to retrieve outdated information from a website that no longer has it listed.

The vulnerability detected in the web application in this scenario is Cross Site Scripting (XSS). This is evident from the fact that when the test script is inserted into the search area and the search button is pressed, a pop-up box appears on the screen with the text "Testing Testing Testing". This indicates that the web application is not properly sanitizing or validating user input, allowing the execution of malicious scripts.

Yancey would be considered a Suicide Hacker because he is willing to face severe consequences, such as going to jail for 30 or more years, in order to take down the company that is downsizing and causing him to lose his job.

The correct order of steps in the CEH System Hacking Cycle is Option A. However, without further information or context, it is not possible to provide a specific explanation for this answer.

The correct answer is Metasploit. Metasploit is a framework that provides information about security vulnerabilities and aids in penetration testing. It allows users to exploit vulnerabilities in systems and gain unauthorized access. The exhibit likely shows the architecture of the Metasploit framework, which includes various components and modules used for scanning, exploiting, and post-exploitation activities.

The correct answer is Distributed Denial of Service Attack. This type of attack involves multiple compromised computers, often spread across different locations, flooding a target system with an overwhelming amount of traffic or requests. This causes the target system to become unavailable to its intended users, resulting in a denial of service.

The correct answer suggests that implementing Encrypted File System (EFS) could have protected the sensitive information on the stolen laptops. EFS is a built-in Windows feature that allows users to encrypt individual files and folders, providing an additional layer of security. By encrypting the sensitive files on the laptops, even if the laptops are stolen, the information would remain encrypted and inaccessible to unauthorized users. This would help prevent the leakage of sensitive information in case of theft or unauthorized access to the laptops.

The correct answer is Session Sniffing Attack. In a session sniffing attack, an attacker intercepts and monitors network traffic to capture session information, such as session IDs or cookies. This allows the attacker to impersonate the user and gain unauthorized access to the user's account or sensitive information. The exhibit likely shows evidence of this type of attack being carried out.

Steganography fits in Step 5: Hide files of the CEH System Hacking Cycle (SHC). Steganography is the technique of hiding secret information within an ordinary file or message to avoid detection. In this step, the attacker may use steganography to hide files or data within seemingly harmless files or images, making it difficult for security measures to detect the hidden information. This allows the attacker to maintain covert access to the compromised system without raising suspicion.

Snow is a steganography utility that exploits the nature of white space and allows the user to conceal information in these white spaces.

The correct answer is 389. LDAP (Lightweight Directory Access Protocol) uses port number 389 for communication. LDAP is a protocol used for accessing and maintaining distributed directory information services over an IP network. Port number 389 is the default port assigned to LDAP, and it is used for both clear text and secure communication.

To disable auditing from the command prompt after gaining access to a victim's computer using the Windows 2003 Server SMB Vulnerability, the command that should be run is "auditpol.exe /disable". This command will disable auditing on the system, preventing any further logging or tracking of activities.

In a Token Injection Replay attack, the attacker captures packets and authentication tokens using a sniffer. They then extract the relevant information and place the tokens back on the network to gain access. This allows the attacker to impersonate a legitimate user and bypass authentication measures.

SAM hash passwords in Windows 7 are stored in the c:\windows\system32\config\SAM location.

Steganography is a technique that allows you to hide data within other files, such as images. By concealing the Sales.xls database within a file like photo.jpg, you can send it out in an innocent-looking email or file transfer without raising suspicion. This method allows you to bypass the company's network security restrictions and monitoring systems, as the data appears to be a harmless image file.

Nessus is the correct answer because it is a popular and widely used vulnerability scanning tool for Linux platforms. It has a comprehensive database of signatures that can detect various vulnerabilities in UNIX, Windows, and commonly used web CGI/ASPX scripts. Additionally, Nessus is capable of detecting DDoS zombies and Trojans, making it a versatile tool for security professionals.

The given HTTP request is an example of a SQL injection attack. In this attack, the attacker is attempting to manipulate the SQL query by adding additional SQL statements within the input parameter "lname". The injected SQL statement is "update usertable set passwd='hAx0r'--", which aims to update the "passwd" field in the "usertable" table. This type of attack can allow unauthorized access to the database and potentially compromise sensitive information.

By observing the job listings for network and system administrators, one can infer the specific operating systems, services, and applications that are being used by the organization. This information can be valuable for foot printing the organization as it provides insight into the technology infrastructure and potential vulnerabilities that may exist.

The given snort rule is designed to generate an alert when a TCP packet is observed on the network originating from any IP address and destined for any IP address on the 192.168.1.0 subnet on port 111. The content parameter in the rule specifies the hexadecimal value "|00 01 86 a5|" that must be present in the packet payload for the rule to match. The msg parameter provides a descriptive message for the alert, indicating that it is related to "mountd access".

The hping2 command responsible for the above snort alert is "hping -S -R -P -A -F -U 192.168.2.56 -p 22 -c 5 -t 118". This command includes various flags that indicate different types of TCP/IP packets being sent to the target IP address and port. The flags -S, -R, -P, -A, -F, and -U represent SYN, RST, PUSH, ACK, FIN, and UDP packets respectively. The fact that these flags are included in the command indicates that the attacker is attempting to perform a remote scan on Jason's network.

The offenders are using HTTP tunneling software to bypass the content filtering system. This software allows them to communicate with protocols in a way that it was not intended, effectively bypassing any restrictions or filters in place. This allows them to access offensive websites during work hours without being detected by Neil's firewall rules and logs.

This attack is a cross-site scripting (XSS) attack. It occurs when a website displays user-provided data without properly sanitizing it, allowing malicious scripts to be injected and executed on the user's browser. In this case, the provided code snippet includes a script tag with a source from a malicious domain, which can be used to carry out unauthorized actions on the user's behalf.

The explanation for the given correct answer is that the FIN flag is indeed set and sent from host A to host B when host A has no more data to transmit and wants to close the TCP connection. This flag is used to release the connection resources. However, even after sending the FIN flag, host A can still receive data as long as the SYN sequence numbers of the transmitted packets from host B are lower than the packet segment containing the set FIN flag. Therefore, the statement is true.

A block cipher is a type of symmetric-key encryption algorithm that operates on fixed-length blocks of plaintext data. It transforms each block of plaintext into a block of ciphertext of the same length using a specific encryption algorithm and a secret key. Unlike stream ciphers that encrypt data bit by bit or byte by byte, block ciphers encrypt data in fixed-sized blocks, providing a higher level of security. The ciphertext produced by a block cipher is also of the same length as the plaintext, making it suitable for applications that require fixed-length data encryption.

Line 17 in the source code might lead to buffer overflow because the C++ functions at that line do not check bounds, which means that they do not verify if the data being written to the buffer exceeds its allocated size. This can result in writing data beyond the buffer's boundaries, causing a buffer overflow vulnerability.

Charlie can use the command "ping -l 56550 172.16.0.45 -t" to attempt to test the capabilities of the new Cisco router and see if it is susceptible to a DoS attack resulting in its locking up.

The suggested explanation is that searching the URL and Anti-Virus product name into Google and looking out for suspicious warnings against the site is the best way to determine if the website is a real Anti-Virus or fake Anti-Virus website. This is because Google search results can often provide information and warnings from other users who may have encountered the website before and can indicate if it is trustworthy or not.

RainbowTables would be the best tool to accomplish this task because it already has the precomputed LM hashes for all possible permutations of the administrator password. This means that Johnny can quickly compare the LM hash of the target password with the precomputed hashes in the RainbowTables to find a match, significantly reducing the time required to crack the password.

An attacker would exploit this design by launching a TCP SYN attack by flooding TCP SYN packets with random source addresses towards a victim host. This flood of SYN packets overwhelms the connection queue on the victim host, causing it to fill up and preventing legitimate connections from being established. This is known as a SYN flood attack, and it can effectively deny service to the victim host by consuming its resources and causing it to become unresponsive.

Penetration testing refers to the process of assessing the security of a network by simulating real-world attacks. It involves using the same methodologies and tools employed by attackers to identify vulnerabilities and weaknesses in the network's defenses. This helps organizations understand their security posture and take necessary measures to strengthen their network security.

A digital signature is not simply a message that is encrypted with the public key instead of the private key. In fact, a digital signature is created by encrypting a hash value of the message with the sender's private key. The recipient can then use the sender's public key to decrypt the digital signature and verify the integrity and authenticity of the message.

Enabling port security on a switch is an effective way to defend against MAC attacks. Port security allows the switch to restrict the number of MAC addresses that can be learned on a specific port. This prevents attackers from flooding the switch with fake MAC addresses or attempting to overload the switch's MAC address table. By limiting the number of MAC addresses, port security ensures that only trusted devices are allowed to connect to the network, thereby protecting against unauthorized access and MAC attacks.

The command "tcpdump -w ./log" is used to create a binary log file using tcpdump. The "-w" option specifies the file name and location for the log file. In this case, the log file will be created in the current directory with the name "log".

This document is called an Information Security Policy (ISP). It is a formal written document that outlines what employees are allowed to use the company's systems for, what is prohibited, and the consequences of breaking the rules. Two printed copies of the policy should be given to every employee, and they should sign one copy to acknowledge their acceptance of its terms. The signed copy should be filed by the company. The ISP ensures that employees are aware of the company's expectations regarding the use of its computer systems and helps maintain security and compliance.

The statement "Antivirus, anti-spyware, and firewall software can very easily detect these type of attacks" is incorrect because while these software can help detect and prevent certain types of attacks, they may not be able to easily detect sophisticated phishing scams like the one described in the question. Phishing attacks often rely on social engineering tactics and can be designed to bypass security software. Therefore, relying solely on antivirus, anti-spyware, and firewall software is not enough to protect against such attacks.

Peter Smith is referring to untrained staff or ignorant computer users as the weakest link in the security chain. Despite having advanced security technologies in place, these individuals can unknowingly compromise the network by falling victim to social engineering attacks, clicking on malicious links or attachments, or sharing sensitive information. Their lack of knowledge or awareness makes them vulnerable to hackers, bypassing the strong security measures implemented. This highlights the importance of educating and training employees to recognize and respond appropriately to potential security threats.

The attacker has used a TOR proxy to cover their tracks. TOR (The Onion Router) is a network of servers that allows users to browse the internet anonymously by encrypting and routing their traffic through multiple nodes. By using a TOR proxy, the attacker can hide their true IP address and location, making it difficult for Gerald to trace back the source of the attack.

The correct answer is a combination of several defensive measures to protect the network from dictionary and brute force attacks. By never leaving a default password, the network eliminates the risk of hackers easily guessing the password. Additionally, by avoiding passwords that can be found in a dictionary and ones related to personal information such as hobbies, pets, relatives, or date of birth, the network increases the complexity of the password, making it harder to crack. Furthermore, using a password that is not related to the hostname, domain name, or any other information that can be found with whois adds another layer of security. By implementing these measures, the network reduces the vulnerability to dictionary and brute force attacks.

A covert channel refers to the act of using a protocol in a manner that it was not originally designed or intended for. This involves exploiting the protocol's features or vulnerabilities to transmit information or perform actions that were not authorized or expected. By using a protocol in an unintended way, individuals can establish hidden communication channels or bypass security measures, making it a covert channel. This can be done to evade detection or gain unauthorized access to systems or information.

WPA2 (Wi-Fi Protected Access 2) uses AES-CCMP (Advanced Encryption Standard - Counter Mode with Cipher Block Chaining Message Authentication Code Protocol) with a key length of 128 bits. AES is a symmetric encryption algorithm widely used for securing sensitive data. CCMP is a cryptographic protocol that provides data confidentiality, integrity, and authentication. The combination of AES and CCMP ensures a high level of security for wireless networks.

When Basic Authentication is configured on web servers, data is sent over the network as clear text, meaning it is not encrypted. This means that anyone who intercepts the data can easily read and understand its contents. This lack of encryption can pose a security risk, as sensitive information such as passwords or personal data can be easily accessed by unauthorized individuals. Therefore, it is important to use additional security measures, such as SSL/TLS encryption, to protect data when Basic Authentication is used.

Bob should use the single quote character to attempt breaking a valid SQL request because it is commonly used in SQL injection attacks to manipulate the structure of the SQL query and potentially gain unauthorized access to the database. By injecting a single quote, Bob can test if the application is vulnerable to SQL injection by observing any error messages or unexpected behavior from the application.

The scenario described in the question involves Bob launching an attack that results in serious financial losses for Brownies Inc. The attack causes their main financial transaction server to crash, requiring human interaction to fix it and rendering the company's resources inaccessible. This aligns with the definition of a Denial of Service (DoS) attack, specifically one that involves crashing a network or system.

Based on the given whois record, an attacker can attempt phishing and social engineering on targeted individuals using the information from the whois record. This is because the whois record may contain personal contact information such as email addresses, which can be used to deceive individuals into revealing sensitive information. Additionally, spammers can send unsolicited emails to the addresses listed in the whois record, as they have access to this information.

The technique described in the given code is called a Polymorphic Virus. This type of virus hides its presence by continually changing its underlying executable code while keeping the original algorithm intact. Each time the virus runs, it mutates the code, but the function of the code remains the same. This allows the virus to evade detection by antivirus software that relies on signature-based detection methods.