CompTIA CS0-003 Online Practice Questions and Exam Preparation

CompTIA CS0-003 Online Questions & Answers

• Question 291:

  Which of the following is described as a method of enforcing a security policy between cloud customers and cloud services?

  A. CASB
  B. DMARC
  C. SIEM
  D. PAM
  A. CASB

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  Explanation

  A CASB (Cloud Access Security Broker) is a security solution that acts as an intermediary between cloud users and cloud providers, and monitors and enforces security policies for cloud access and usage. A CASB can help organizations protect their data and applications in the cloud from unauthorized or malicious access, as well as comply with regulatory standards and best practices. A CASB can also provide visibility, control, and analytics for cloud activity, and identify and mitigate potential threats

  The other options are not correct. DMARC (Domain-based Message Authentication, Reporting and Conformance) is an email authentication protocol that helps email domain owners prevent spoofing and phishing attacks by verifying the sender's identity and instructing the receiver how to handle unauthenticated messages SIEM (Security Information and Event Management) is a security solution that collects, aggregates, and analyzes log data from various sources across an organization's network, such as applications, devices, servers, and users, and provides real-time alerts, dashboards, reports, and incident response capabilities to help security teams identify and mitigate cyberattacks PAM (Privileged Access Management) is a security solution that helps organizations manage and protect the access and permissions of users, accounts, processes, and systems that have elevated or administrative privileges. PAM can help prevent credential theft, data breaches, insider threats, and compliance violations by monitoring, detecting, and preventing unauthorized privileged access to critical resources

• Question 292:

  A security audit for unsecured network services was conducted, and the following output was generated:

  

  Which of the following services should the security team investigate further? (Select two).

  A. 21
  B. 22
  C. 23
  D. 636
  E. 1723
  F. 3389
  C. 23
  D. 636

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  Explanation

  The output shows the results of a port scan, which is a technique used to identify open ports and services running on a network host. Port scanning can be used by attackers to discover potential vulnerabilities and exploit them, or by defenders to assess the security posture and configuration of their network devices 1.

  The output lists six ports that are open on the target host, along with the service name and version associated with each port. The service name indicates the type of application or protocol that is using the port, while the version indicates the specific release or update of the service. The service name and version can provide useful information for both attackers and defenders, as they can reveal the capabilities, features, and weaknesses of the service.

  Among the six ports listed, two are particularly risky and should be investigated further by the security team: port 23 and port 636. Port 23 is used by Telnet, which is an old and insecure protocol for remote login and command execution.

  Telnet does not encrypt any data transmitted over the network, including usernames and passwords, which makes it vulnerable to eavesdropping, interception, and modification by attackers. Telnet also has many known vulnerabilities that can allow attackers to gain unauthorized access, execute arbitrary commands, or cause denial-of-service attacks on the target host23 Port 636 is used by LDAP over SSL/TLS (LDAPS), which is a protocol for accessing and modifying directory services over a secure connection. LDAPS encrypts the data exchanged between the client and the server using SSL/TLS certificates, which provide authentication, confidentiality, and integrity. However, LDAPS can also be vulnerable to attacks if the certificates are not properly configured, verified, or updated. For example, attackers can use self-signed or expired certificates to perform man-in-the-middle attacks, spoofing attacks, or certificate revocation attacks on LDAPS connections. Therefore, the security team should investigate further why port 23 and port 636 are open on the target host, and what services are running on them. The security team should also consider disabling or replacing these services with more secure alternatives, such as SSH for port 23 and StartTLS for port 6362

• Question 293:

  A security analyst is working on a server patch management policy that will allow the infrastructure team to be informed more quickly about new patches.

  Which of the following would most likely be required by the infrastructure team so that vulnerabilities can be remediated quickly? (Select two).

  A. Hostname
  B. Missing KPI
  C. CVE details
  D. POC availability
  E. loCs
  F. npm identifier
  A. Hostname
  C. CVE details

• Question 294:

  An analyst is evaluating the following vulnerability report:

  

  Which of the following vulnerability report sections provides information about the level of impact on data confidentiality if a successful exploitation occurs?

  A. Payloads
  B. Metrics
  C. Vulnerability
  D. Profile
  B. Metrics

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  Explanation

  The Metrics section of the vulnerability report provides information about the level of impact on data confidentiality if a successful exploitation occurs. The Metrics section contains the CVE dictionary entry and the CVSS base score of the vulnerability. CVE stands for Common Vulnerabilities and Exposures and it is a standardized system for identifying and naming vulnerabilities. CVSS stands for Common Vulnerability Scoring System and it is a standardized system for measuring and rating the severity of vulnerabilities. The CVSS base score is a numerical value between 0 and 10 that reflects the intrinsic characteristics of a vulnerability, such as its exploitability, impact, and scope. The CVSS base score is composed of three metric groups: Base, Temporal, and Environmental. The Base metric group captures the characteristics of a vulnerability that are constant over time and across user environments. The Base metric group consists of six metrics: Attack Vector, Attack Complexity, Privileges Required, User Interaction, Scope, and Impact. The Impact metric measures the effect of a vulnerability on the confidentiality, integrity, and availability of the affected resources. In this case, the CVSS base score of the vulnerability is 9.8, which indicates a critical severity level. The Impact metric of the CVSS base score is 6.0, which indicates a high impact on confidentiality, integrity, and availability. Therefore, the Metrics section provides information about the level of impact on data confidentiality if a successful exploitation occurs.

  The other sections of the vulnerability report do not provide information about the level of impact on data confidentiality if a successful exploitation occurs. The Payloads section contains links to request and response payloads that demonstrate how the vulnerability can be exploited. The Payloads section can help an analyst to understand how the attack works, but it does not provide a quantitative measure of the impact. The Vulnerability section contains information about the type, group, and description of the vulnerability. The Vulnerability section can help an analyst to identify and classify the vulnerability, but it does not provide a numerical value of the impact. The Profile section contains information about the authentication, times viewed, and aggressiveness of the vulnerability. The Profile section can help an analyst to assess the risk and priority of the vulnerability, but it does not provide a specific measure of the impact on data confidentiality.

  References:

  [1] CVE - Common Vulnerabilities and Exposures (CVE) [2] Common Vulnerability Scoring System SIG

  [3] CVSS v3.1 Specification Document

  [4] CVSS v3.1 User Guide

  [5] How to Read a Vulnerability Report - Security Boulevard

• Question 295:

  An employee is no longer able to log in to an account after updating a browser. The employee usually has several tabs open in the browser.

  Which of the following attacks was most likely performed?

  A. RFI
  B. LFI
  C. CSRF
  D. XSS
  C. CSRF

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  Explanation

  The most likely attack that was performed is CSRF (Cross-Site Request Forgery). This is an attack that forces a user to execute unwanted actions on a web application in which they are currently authenticated 1. If the user has several tabs open in the browser, one of them might contain a malicious link or form that sends a request to the web application to change the user's password, email address, or other account settings. The web application will not be able to distinguish between the legitimate requests made by the user and the forged requests made by the attacker. As a result, the user will lose access to their account. To prevent CSRF attacks, web applications should implement some form of anti-CSRF tokens or other mechanisms that validate the origin and integrity of the requests 2. These tokens are unique and unpredictable values that are generated by the server and embedded in the forms or URLs that perform state-changing actions.

  The server will then verify that the token received from the client matches the token stored on the server before processing the request. This way, an attacker cannot forge a valid request without knowing the token value.

  Some other possible attacks that are not relevant to this scenario are: RFI (Remote File Inclusion) is an attack that allows an attacker to execute malicious code on a web server by including a remote file in a script. This attack does not affect the user's browser or account settings. LFI (Local File Inclusion) is an attack that allows an attacker to read or execute local files on a web server by manipulating the input parameters of a script. This attack does not affect the user's browser or account settings. XSS (Cross-Site Scripting) is an attack that injects malicious code into a web page that is then executed by the user's browser. This attack can affect the user's browser or account settings, but it requires the user to visit a compromised web page or click on a malicious link. It does not depend on having several tabs open in the browser.

• Question 296:

  A security analyst needs to identify services in a critical infrastructure ICS network. Many components may break with malformed or unusually large requests.

  Which is the safest method to identify service versions?

  A. Use nmap -sV to identify all assets
  B. Use Burp Suite for service identification
  C. Use nc to manually perform banner grabbing
  D. Use Nessus with restricted concurrent connections
  C. Use nc to manually perform banner grabbing

• Question 297:

  Which of the following items should be included in a vulnerability scan report? (Choose two.)

  A. Lessons learned
  B. Service-level agreement
  C. Playbook
  D. Affected hosts
  E. Risk score
  F. Education plan
  D. Affected hosts
  E. Risk score

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  Explanation

  A vulnerability scan report should include information about the affected hosts, such as their IP addresses, hostnames, operating systems, and services. It should also include a risk score for each vulnerability, which indicates the severity and potential impact of the vulnerability on the host and the organization. Official

  https://www.first.org/cvss/

• Question 298:

  A cybersecurity analyst is doing triage in a SIEM and notices that the time stamps between the firewall and the host under investigation are off by 43 minutes.

  Which of the following is the most likely scenario occurring with the time stamps?

  A. The NTP server is not configured on the host.
  B. The cybersecurity analyst is looking at the wrong information.
  C. The firewall is using UTC time.
  D. The host with the logs is offline.
  A. The NTP server is not configured on the host.

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  Explanation

  The most likely scenario occurring with the time stamps is that the NTP server is not configured on the host. NTP is the Network Time Protocol, which is used to synchronize the clocks of computers over a network. NTP uses a hierarchical system of time sources, where each level is assigned a stratum number. The most accurate time sources, such as atomic clocks or GPS receivers, are at stratum 0, and the devices that synchronize with them are at stratum 1, and so on. NTP clients can query multiple NTP servers and use algorithms to select the best time source and adjust their clocks accordingly 1. If the NTP server is not configured on the host, the host will rely on its own hardware clock, which may drift over time and become inaccurate. This can cause discrepancies in the time stamps between the host and other devices on the network, such as the firewall, which may be synchronized with a different NTP server or use a different time zone. This can affect the security analysis and correlation of events, as well as the compliance and auditing of the network.

• Question 299:

  An organization needs to bring in data collection and aggregation from various endpoints.

  Which of the following is the best tool to deploy to help analysts gather this data?

  A. DLP
  B. NAC
  C. EDR
  D. NIDS
  C. EDR

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  Explanation

  EDR stands for Endpoint Detection and Response, which is a tool that collects and aggregates data from various endpoints, such as laptops, servers, or mobile devices. EDR helps analysts monitor, detect, and respond to threats and incidents on the endpoints. EDR is more suitable than DLP (Data Loss Prevention), NAC (Network Access Control), or NIDS (Network Intrusion Detection System) for data collection and aggregation from endpoints.

  References:

  CompTIA CySA+ CS0-003 Certification Study Guide, Chapter 2: Software and Systems Security, page 75

  What Is Data Aggregation? (Examples + Tools), Section: Data Aggregation: How It Works, Subsection: 1. Data Collection.

• Question 300:

  An organization wants to move non-essential services into a cloud computing environment. The management team has a cost focus and would like to achieve a recovery time objective of 12 hours.

  Which of the following cloud recovery strategies would work best to attain the desired outcome?

  A. Duplicate all services in another instance and load balance between the instances.
  B. Establish a hot site with active replication to another region within the same cloud provider.
  C. Set up a warm disaster recovery site with the same cloud provider in a different region.
  D. Configure the systems with a cold site at another cloud provider that can be used for failover.
  C. Set up a warm disaster recovery site with the same cloud provider in a different region.

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  Explanation

  Setting up a warm disaster recovery site with the same cloud provider in a different region can help to achieve a recovery time objective (RTO) of 12 hours while keeping the costs low. A warm disaster recovery site is a partially configured site that has some of the essential hardware and software components ready to be activated in case of a disaster. A warm site can provide faster recovery than a cold site, which has no preconfigured components, but lower costs than a hot site, which has fully configured and replicated components. Using the same cloud provider can help to simplify the migration and synchronization processes, while using a different region can help to avoid regional outages or disasters .

  https://www.techopedia.com/definition39/memory-dump