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| Section | Objectives |
|---|---|
| Introduction to Ethical Hacking | - Ethical hacking concepts and methodology |
| System Hacking | - Gaining access and privilege escalation - Malware threats and system exploitation |
| Network Attacks | - Denial of Service (DoS/DDoS) - Sniffing and session hijacking |
| Reconnaissance Techniques | - Footprinting and information gathering - Scanning networks and enumeration |
| Web and Application Security | - Web application hacking techniques |
| Cloud and IoT Security | - Cloud computing security concepts - IoT security fundamentals |
| Cryptography | - Encryption, hashing, and cryptanalysis |
| Wireless and Mobile Security | - Wireless network attacks - Mobile platform vulnerabilities |
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NEW QUESTION # 547
A financial institution in Chicago deploys an internal HTTPS-based customer portal that uses response compression to optimize bandwidth. During an authorized security assessment, a tester gains a vantage point along the communication path between internal clients and the gateway device.
By repeatedly initiating controlled requests and analyzing subtle differences in encrypted response sizes, the tester correlates variations in compressed output with specific input patterns.
Over time, this analysis enables extraction of portions of a protected authentication value transmitted within the secure channel.
Which session hijacking technique best describes this activity?
Answer: D
Explanation:
The scenario describes exploiting HTTPS compression by analyzing differences in encrypted response sizes to infer sensitive data such as authentication values. This matches the CRIME attack, which leverages compression side-channel information leakage within secure communication channels.
NEW QUESTION # 548
Robin, an attacker, is attempting to bypass the firewalls of an organization through the DNS tunneling method in order to exfiltrate data. He is using the NSTX tool for bypassing the firewalls. On which of the following ports should Robin run the NSTX tool?
Answer: C
Explanation:
DNS uses Ports 53 which is almost always open on systems, firewalls, and clients to transmit DNS queries.
instead of the more familiar Transmission Control Protocol (TCP) these queries use User Datagram Protocol (UDP) due to its low-latency, bandwidth and resource usage compared TCP-equivalent queries. UDP has no error or flow-control capabilities, nor does it have any integrity checking to make sure the info arrived intact.
How is internet use (browsing, apps, chat etc) so reliable then? If the UDP DNS query fails (it's a best-effort protocol after all) within the first instance, most systems will retry variety of times and only after multiple failures, potentially switch to TCP before trying again; TCP is additionally used if the DNS query exceeds the restrictions of the UDP datagram size - typically 512 bytes for DNS but can depend upon system settings.
Figure 1 below illustrates the essential process of how DNS operates: the client sends a question string (for example, mail.google[.]com during this case) with a particular type - typically A for a number address. I've skipped the part whereby intermediate DNS systems may need to establish where '.com' exists, before checking out where 'google[.]com' are often found, and so on.
Many worms and scanners are created to seek out and exploit systems running telnet. Given these facts, it's really no surprise that telnet is usually seen on the highest Ten Target Ports list. Several of the vulnerabilities of telnet are fixed. They require only an upgrade to the foremost current version of the telnet Daemon or OS upgrade. As is usually the case, this upgrade has not been performed on variety of devices. this might flow from to the very fact that a lot of systems administrators and users don't fully understand the risks involved using telnet. Unfortunately, the sole solution for a few of telnets vulnerabilities is to completely discontinue its use. the well-liked method of mitigating all of telnets vulnerabilities is replacing it with alternate protocols like ssh. Ssh is capable of providing many of an equivalent functions as telnet and a number of other additional services typical handled by other protocols like FTP and Xwindows. Ssh does still have several drawbacks to beat before it can completely replace telnet. it's typically only supported on newer equipment. It requires processor and memory resources to perform the info encryption and decryption. It also requires greater bandwidth than telnet thanks to the encryption of the info . This paper was written to assist clarify how dangerous the utilization of telnet are often and to supply solutions to alleviate the main known threats so as to enhance the general security of the web Once a reputation is resolved to an IP caching also helps: the resolved name-to-IP is usually cached on the local system (and possibly on intermediate DNS servers) for a period of your time . Subsequent queries for an equivalent name from an equivalent client then don't leave the local system until said cache expires. Of course, once the IP address of the remote service is understood , applications can use that information to enable other TCP-based protocols, like HTTP, to try to to their actual work, for instance ensuring internet cat GIFs are often reliably shared together with your colleagues.So, beat all, a couple of dozen extra UDP DNS queries from an organization's network would be fairly inconspicuous and will leave a malicious payload to beacon bent an adversary; commands could even be received to the requesting application for processing with little difficulty.
NEW QUESTION # 549
In order to tailor your tests during a web-application scan, you decide to determine which web-server version is hosting the application. On using the sV flag with Nmap. you obtain the following response:
80/tcp open http-proxy Apache Server 7.1.6
what Information-gathering technique does this best describe?
Answer: C
Explanation:
Banner grabbing is a technique wont to gain info about a computer system on a network and the services running on its open ports. administrators will use this to take inventory of the systems and services on their network. However, an to find will use banner grabbing so as to search out network hosts that are running versions of applications and operating systems with known exploits.
Some samples of service ports used for banner grabbing are those used by Hyper Text Transfer Protocol (HTTP), File Transfer Protocol (FTP), and Simple Mail Transfer Protocol (SMTP); ports 80, 21, and 25 severally. Tools normally used to perform banner grabbing are Telnet, nmap and Netcat.
For example, one may establish a connection to a target internet server using Netcat, then send an HTTP request. The response can usually contain info about the service running on the host:
Graphical user interface, text, application Description automatically generated
This information may be used by an administrator to catalog this system, or by an intruder to narrow down a list of applicable exploits.To prevent this, network administrators should restrict access to services on their networks and shut down unused or unnecessary services running on network hosts. Shodan is a search engine for banners grabbed from portscanning the Internet.
NEW QUESTION # 550
In your role as a cybersecurity specialist for a growing tech company, you are tasked with performing a regular network scan to check for any potential vulnerabilities. Your manager has specifically asked you to use a NULL scan for this round. In the context of TCP NULL scanning, what response (or lack thereof) would indicate that a particular port on a target machine is closed?
Answer: A
Explanation:
In a TCP NULL scan, a closed port responds with a TCP RST packet, indicating that the port is not open and actively rejects the unexpected packet with no flags set.
NEW QUESTION # 551
Robin, a professional hacker, targeted an organization's network to sniff all the traffic. During this process.
Robin plugged in a rogue switch to an unused port in the LAN with a priority lower than any other switch in the network so that he could make it a root bridge that will later allow him to sniff all the traffic in the network.
What is the attack performed by Robin in the above scenario?
Answer: B
Explanation:
STP prevents bridging loops in a redundant switched network environment. By avoiding loops, you can ensure that broadcast traffic does not become a traffic storm.
STP is a hierarchical tree-like topology with a "root" switch at the top. A switch is elected as root based on the lowest configured priority of any switch (0 through 65,535). When a switch boots up, it begins a process of identifying other switches and determining the root bridge. After a root bridge is elected, the topology is established from its perspective of the connectivity. The switches determine the path to the root bridge, and all redundant paths are blocked. STP sends configuration and topology change notifications and acknowledgments (TCN/TCA) using bridge protocol data units (BPDU).
An STP attack involves an attacker spoofing the root bridge in the topology. The attacker broadcasts out an STP configuration/topology change BPDU in an attempt to force an STP recalculation. The BPDU sent out announces that the attacker's system has a lower bridge priority. The attacker can then see a variety of frames forwarded from other switches to it. STP recalculation may also cause a denial-of-service (DoS) condition on the network by causing an interruption of 30 to 45 seconds each time the root bridge changes. An attacker using STP network topology changes to force its host to be elected as the root bridge.
NEW QUESTION # 552
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