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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q284-Q289):

NEW QUESTION # 284
Joseph was the Web site administrator for the Mason Insurance in New York, who's main Web site was located at www.masonins.com. Joseph uses his laptop computer regularly to administer the Web site. One night, Joseph received an urgent phone call from his friend, Smith. According to Smith, the main Mason Insurance web site had been vandalized! All of its normal content was removed and replaced with an attacker's message ''Hacker Message: You are dead! Freaks!" From his office, which was directly connected to Mason Insurance's internal network, Joseph surfed to the Web site using his laptop. In his browser, the Web site looked completely intact.
No changes were apparent. Joseph called a friend of his at his home to help troubleshoot the problem. The Web site appeared defaced when his friend visited using his DSL connection. So, while Smith and his friend could see the defaced page, Joseph saw the intact Mason Insurance web site. To help make sense of this problem, Joseph decided to access the Web site using hisdial-up ISP. He disconnected his laptop from the corporate internal network and used his modem to dial up the same ISP used by Smith. After his modem connected, he quickly typed www.masonins.com in his browser to reveal the following web page:

After seeing the defaced Web site, he disconnected his dial-up line, reconnected to the internal network, and used Secure Shell (SSH) to log in directly to the Web server. He ran Tripwire against the entire Web site, and determined that every system file and all the Web content on the server were intact. How did the attacker accomplish this hack?

A. SQL injection
B. Routing table injection
C. DNS poisoning
D. ARP spoofing

Answer: C

NEW QUESTION # 285
The network team has well-established procedures to follow for creating new rules on the firewall. This includes having approval from a manager prior to implementing any new rules. While reviewing the firewall configuration, you notice a recently implemented rule but cannot locate manager approval for it. What would be a good step to have in the procedures for a situation like this?

A. Do not roll back the firewall rule as the business may be relying upon it, but try to get manager approval as soon as possible.
B. Monitor all traffic using the firewall rule until a manager can approve it.
C. Immediately roll back the firewall rule until a manager can approve it
D. Have the network team document the reason why the rule was implemented without prior manager approval.

Answer: A,B,C,D

Explanation:
Without documented approval, the firewall rule could represent an unauthorized change or security risk.
Rolling it back until proper change control processes are followed is consistent with best practices in security governance.
CEH v13 Reference:
Module 1: Introduction to Ethical Hacking
"Unauthorized changes to security devices should be immediately reviewed and reverted until formal approval is obtained."
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NEW QUESTION # 286
Susan has attached to her company's network. She has managed to synchronize her boss's sessions with that of the file server. She then intercepted his traffic destined for the server, changed it the way she wanted to and then placed it on the server in his home directory.
What kind of attack is Susan carrying on?

A. A man in the middle attack
B. A denial of service attack
C. A spoofing attack
D. A sniffing attack

Answer: A

NEW QUESTION # 287
You are the chief security officer at AlphaTech, a tech company that specializes in data storage solutions.
Your company is developing a new cloud storage platform where users can store their personal files. To ensure data security, the development team is proposing to use symmetric encryption for data at rest.
However, they are unsure of how to securely manage and distribute the symmetric keys to users. Which of the following strategies would you recommend to them?

A. Use hash functions to distribute the keys.
B. Use digital signatures to encrypt the symmetric keys.
C. Use HTTPS protocol for secure key transfer.
D. implement the Diffie-Hellman protocol for secure key exchange.

Answer: C

Explanation:
Symmetric encryption is a method of encrypting and decrypting data using the same secret key. Symmetric encryption is fast and efficient, but it requires a secure way of managing and distributing the keys to the users who need them. If the keys are compromised, the data is no longer secure.
One of the strategies to securely manage and distribute symmetric keys is to use HTTPS protocol for secure key transfer. HTTPS is a protocol that uses SSL/TLS to encrypt the communication between a client and a server over the Internet. HTTPS can protect the symmetric keys from being intercepted or modified by an attacker during the key transfer process. HTTPS can also authenticate the server and the client using certificates, ensuring that the keys are sent to and received by the intended parties.
To use HTTPS protocol for secure key transfer, the development team needs to implement the following steps1:
* Generate a symmetric key for each user who wants to store their files on the cloud storage platform.
The symmetric key will be used to encrypt and decrypt the user's files.
* Generate a certificate for the cloud storage server. The certificate will contain the server's public key and other information, such as the server's domain name, the issuer, and the validity period. The certificate will be signed by a trusted certificate authority (CA), which is a third-party entity that verifies the identity and legitimacy of the server.
* Install the certificate on the cloud storage server and configure the server to use HTTPS protocol for communication.
* When a user wants to upload or download their files, the user's client (such as a web browser or an app) will initiate a HTTPS connection with the cloud storage server. The client will verify the server's certificate and establish a secure session with the server using SSL/TLS. The client and the server will negotiate a session key, which is a temporary symmetric key that will be used to encrypt the data exchanged during the session.
* The cloud storage server will send the user's symmetric key to the user's client, encrypted with the session key. The user's client will decrypt the symmetric key with the session key and use it to encrypt or decrypt the user's files.
* The user's client will store the symmetric key securely on the user's device, such as in a password- protected file or a hardware token. The user's client will also delete the session key after the session is over.
Using HTTPS protocol for secure key transfer can ensure that the symmetric keys are protected from eavesdropping, tampering, or spoofing attacks. However, this strategy also has some challenges and limitations, such as:
* The development team needs to obtain and maintain valid certificates for the cloud storage server from a trusted CA, which might incur costs and administrative overhead.
* The users need to trust the CA that issued the certificates for the cloud storage server and verify the certificates before accepting them.
* The users need to protect their symmetric keys from being lost, stolen, or corrupted on their devices.
The development team needs to provide a mechanism for key backup, recovery, or revocation in case of such events.
* The users need to update their symmetric keys periodically to prevent key exhaustion or reuse attacks.
The development team needs to provide a mechanism for key rotation or renewal in a secure and efficient manner.
References:
* Key Management - OWASP Cheat Sheet Series
* Symmetric Cryptography & Key Management: Exhaustion, Rotation, Defence
* What is Key Management? How does Key Management work? | Encryption Consulting

NEW QUESTION # 288
What tool can crack Windows SMB passwords simply by listening to network traffic?

A. Netbus
B. NTFSDOS
C. L0phtcrack
D. This is not possible

Answer: C

NEW QUESTION # 289
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