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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q100-Q105):

NEW QUESTION # 100
Which access control mechanism allows for multiple systems to use a central authentication server (CAS) that permits users to authenticate once and gain access to multiple systems?

A. Single sign-on
B. Windows authentication
C. Role Based Access Control (RBAC)
D. Discretionary Access Control (DAC)

Answer: A

NEW QUESTION # 101
An audacious attacker is targeting a web server you oversee. He intends to perform a Slow HTTP POST attack, by manipulating 'a' HTTP connection. Each connection sends a byte of data every 'b' second, effectively holding up the connections for an extended period. Your server is designed to manage 'm' connections per second, but any connections exceeding this number tend to overwhelm the system. Given
'a=100' and variable 'm', along with the attacker's intention of maximizing the attack duration 'D=a*b', consider the following scenarios. Which is most likely to result in the longest duration of server unavailability?

A. m=105, b=12: The server can manage 105 connections per second, more than the attacker's 100 connections, likely maintaining operation despite a moderate hold-up time
B. m=110, b=20: Despite the attacker sending 100 connections, the server can handle 110 connections per second, therefore likely staying operative, regardless of the hold-up time per connection
C. m=90, b=15: The server can manage 90 connections per second, but the attacker's 100 connections exceed this, and with each connection held up for 15 seconds, the attack duration could be significant
D. 95, b=10: Here, the server can handle 95 connections per second, but it falls short against the attacker's 100 connections, albeit the hold-up time per connection is lower

Answer: C

Explanation:
A Slow HTTP POST attack is a type of denial-of-service (DoS) attack that exploits the way web servers handle HTTP requests. The attacker sends a legitimate HTTP POST header to the web server, specifying a large amount of data to be sent in the request body. However, the attacker then sends the data very slowly, keeping the connection open and occupying the server's resources. The attacker can launch multiple such connections, exceeding the server's capacity to handle concurrent requests and preventing legitimate users from accessing the web server.
The attack duration D is given by the formula D = a * b, where a is the number of connections and b is the hold-up time per connection. The attacker intends to maximize D by manipulating a and b. The server can manage m connections per second, but any connections exceeding m will overwhelm the system. Therefore, the scenario that is most likely to result in the longest duration of server unavailability is the one where a > m and b is the largest. Among the four options, this is the case for option B, where a = 100, m = 90, and b = 15.
In this scenario, D = 100 * 15 = 1500 seconds, which is the longest among the four options. Option A has a larger b, but a < m, so the server can handle the connections without being overwhelmed. Option C has a > m, but a smaller b, so the attack duration is shorter. Option D has a > m, but a smaller b and a smaller difference between a and m, so the attack duration is also shorter. References:
* What is a Slow POST Attack & How to Prevent One? (Guide)
* Mitigate Slow HTTP GET/POST Vulnerabilities in the Apache HTTP Server - Acunetix
* What is a Slow Post DDoS Attack? | NETSCOUT

NEW QUESTION # 102
Jude, a pen tester working in Keiltech Ltd., performs sophisticated security testing on his company's network infrastructure to identify security loopholes. In this process, he started to circumvent the network protection tools and firewalls used in the company. He employed a technique that can create forged TCP sessions by carrying out multiple SYN, ACK, and RST or FIN packets. Further, this process allowed Jude to execute DDoS attacks that can exhaust the network resources. What is the attack technique used by Jude for finding loopholes in the above scenario?

A. Ping-of-death attack
B. Spoofed session flood attack
C. UDP flood attack
D. Peer-to-peer attack

Answer: B

Explanation:
In order to circumvent network protection tools, cybercriminals may forge a TCP session more efficiently by submitting a bogus SYN packet, a series of ACK packets, and at least one RST (reset) or FIN (connection termination) packet. This tactic allows crooks to get around defenses that only keep tabs on incoming traffic rather than analyzing return traffic.

NEW QUESTION # 103
Ethical hacker jane Smith is attempting to perform an SQL injection attach. She wants to test the response time of a true or false response and wants to use a second command to determine whether the database will return true or false results for user IDs. which two SQL Injection types would give her the results she is looking for?

A. union-based and error-based
B. Out of band and boolean-based
C. Time-based and union-based
D. Time-based and boolean-based

Answer: D

Explanation:
"Boolean based" we mean that it is based on Boolean values, that is, true or false / true and false. AND Time- based SQL Injection is an inferential SQL Injection technique that relies on sending an SQL query to the database which forces the database to wait for a specified amount of time (in seconds) before responding. The response time will indicate to the attacker whether the result of the query is TRUE or FALSE.
Boolean-based (content-based) Blind SQLi
Boolean-based SQL Injection is an inferential SQL Injection technique that relies on sending an SQL query to the database which forces the application to return a different result depending on whether the query returns a TRUE or FALSE result.
Depending on the result, the content within the HTTP response will change, or remain the same. This allows an attacker to infer if the payload used returned true or false, even though no data from the database is returned. This attack is typically slow (especially on large databases) since an attacker would need to enumerate a database, character by character.
Time-based Blind SQLi
Time-based SQL Injection is an inferential SQL Injection technique that relies on sending an SQL query to the database which forces the database to wait for a specified amount of time (in seconds) before responding. The response time will indicate to the attacker whether the result of the query is TRUE or FALSE.
Depending on the result, an HTTP response will be returned with a delay, or returned immediately.
This allows an attacker to infer if the payload used returned true or false, even though no data from the database is returned. This attack is typically slow (especially on large databases) since an attacker would need to enumerate a database character by character.
https://www.acunetix.com/websitesecurity/sql-injection2/

NEW QUESTION # 104
Shellshock allowed an unauthorized user to gain access to a server. It affected many Internet-facing services, which OS did it not directly affect?

A. OS X
B. Linux
C. Unix
D. Windows

Answer: D

NEW QUESTION # 105
......

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