CompTIA CS0-003 Online Practice Questions and Exam Preparation

CompTIA CS0-003 Online Questions & Answers

• Question 661:

  During an incident, analysts need to rapidly investigate by the investigation and leadership teams.

  Which of the following best describes how PII should be safeguarded during an incident?

  A. Implement data encryption and close the data so only the company has access.
  B. Ensure permissions are limited in the investigation team and encrypt the data.
  C. Implement data encryption and create a standardized procedure for deleting data that is no longer needed.
  D. Ensure that permissions are open only to the company.
  B. Ensure permissions are limited in the investigation team and encrypt the data.

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  Explanation

  The best option to safeguard PII during an incident is to ensure permissions are limited in the investigation team and encrypt the data. This is because limiting permissions reduces the risk of unauthorized access or leakage of sensitive data, and encryption protects the data from being read or modified by anyone who does not have the decryption key.

  Option A is not correct because closing the data may hinder the investigation process and prevent collaboration with other parties who may need access to the data.

  Option C is not correct because deleting data that is no longer needed may violate legal or regulatory requirements for data retention, and may also destroy potential evidence for the incident.

  Option D is not correct because opening permissions to the company may expose the data to more people than necessary, increasing the risk of compromise or misuse.

  References:

  CompTIA CySA+ Study Guide: Exam CS0-002, 2nd Edition, Chapter 4, "Data Protection and Privacy Practices", page 195

  CompTIA CySA+ Certification Exam Objectives Version 4.0, Domain 4.0 "Compliance and Assessment", Objective 4.1 "Given a scenario, analyze data as part of a security incident", Sub-

  objective "Data encryption", page CompTIA CySA+ Study Guide: Exam CS0-002, 2nd Edition : CompTIA CySA+ Certification Exam Objectives Version 4.0.pdf)

• Question 662:

  Patches for two highly exploited vulnerabilities were released on the same Friday afternoon. Information about the systems and vulnerabilities is shown in the tables below:

  

  

  Which of the following should the security analyst prioritize for remediation?

  A. rogers
  B. brady
  C. brees
  D. manning
  B. brady

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  Explanation

  Brady should be prioritized for remediation, as it has the highest risk score and the highest number of affected users. The risk score is calculated by multiplying the CVSS score by the exposure factor, which is the percentage of systems that are vulnerable to the exploit. Brady has a risk score of 9 x 0.8 = 7.2, which is higher than any other system. Brady also has 500 affected users, which is more than any other system. Therefore, patching brady would reduce the most risk and impact for the organization. The other systems have lower risk scores and lower numbers of affected users, so they can be remediated later.

• Question 663:

  Which of the following lines from this output most likely indicates that attackers could quickly use brute force and determine the negotiated secret session key?

  

  A. TLS_RSA_WITH_DES_CBC_SHA 56
  B. TLS_DHE_RSA_WITH_AES_128_CBC_SHA 128 DH (1024 bits)
  C. TLS_RSA_WITH_AES_256_CBC_SHA 256
  D. TLS_DHE_RSA_WITH_AES_256_GCM_SHA256 DH (2048 bits)
  A. TLS_RSA_WITH_DES_CBC_SHA 56

• Question 664:

  A finance department employee opens an unsolicited email that contains a malicious payload. The payload quickly spreads through the finance department, but does not affect other departments.

  Which of the following best explains why the payload does not affect all departments?

  A. OS version
  B. Offline computers
  C. Firewall configuration
  D. Network segmentation
  D. Network segmentation

• Question 665:

  An analyst needs to understand how an attacker compromised a server.

  Which of the following procedures will best deliver the information that is necessary to reconstruct the steps taken by the attacker?

  A. Scan the affected system with an anti-malware tool and check for vulnerabilities with a vulnerability scanner.
  B. Extract the server's system timeline, verifying hashes and network connections during a certain time frame.
  C. Clone the entire system and deploy it in a network segment built for tests and investigations while monitoring the system during a certain time frame.
  D. Clone the server's hard disk and extract all the binary files, comparing hash signatures with malware databases.
  B. Extract the server's system timeline, verifying hashes and network connections during a certain time frame.

• Question 666:

  Which of the following is the appropriate phase in the incident response process to perform a vulnerability scan to determine the effectiveness of corrective actions?

  A. Lessons learned
  B. Reporting
  C. Recovery
  D. Root cause analysis
  C. Recovery

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  Explanation

  Comprehensive and Detailed Step-by-Step Explanation:Performing a vulnerability scan during the recovery phase ensures that corrective actions, such as patches or configuration changes, have effectively addressed the vulnerabilities exploited during the incident. This step validates the system's security before fully restoring operations.

  References:

  CompTIA CySA+ Objectives (Domain 3.0 - Incident Response) CompTIA CySA+ Practice Tests (Chapter 3: Containment, Eradication, and Recovery)

• Question 667:

  Which of the following is the most important reason for an incident response team to develop a formal incident declaration?

  A. To require that an incident be reported through the proper channels
  B. To identify and document staff who have the authority to declare an incident
  C. To allow for public disclosure of a security event impacting the organization
  D. To establish the department that is responsible for responding to an incident
  B. To identify and document staff who have the authority to declare an incident

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  Explanation

  The formal incident declaration is crucial to identify and document the staff who have the authority to declare an incident, ensuring that incidents are handled by authorized personnel.

  References:

  CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 5: Incident Response, page 197.

• Question 668:

  The SOC receives a number of complaints regarding a recent uptick in desktop error messages that are associated with workstation access to an internal web application. An analyst, identifying a recently modified XML file on the web server, retrieves a copy of this file for review, which contains the following code:

  

  <?xml version="1.0" encoding="UTF-8"?>

  <?xml-stylesheet type="text/xsl" href="default.xsl"?>

  <intro>

  <firstintro>

  <name>Welcome</name>

  <description>

  Welcome <script type="text/javascript">alert("Your system is interface.Contact a service technician at gethe-p.now.xyz");</script>, to our internal employee training catalog. From this page, you can access essential training regarding the handling of PHI Patient Health Information must be safeguarded from unauthorized access.

  </description>

  </firstintro>

  </intro>

  Which of The following XML schema constraints would stop these desktop error messages from appearing?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  B. Option B

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  Explanation

  The XML file contains JavaScript embedded within a <description> tag that executes an alert message, which is a common Cross-Site Scripting (XSS) attack vector. The issue occurs because the XML schema does not restrict the input to safe characters, allowing arbitrary script execution when the XML file is processed by a vulnerable application.

  Solution: Implement Input Validation Using an XML Schema Constraint Option B enforces a whitelist approach by allowing only alphanumeric characters and spaces ([a-zA-Z 0-9]*). This prevents the inclusion of malicious JavaScript or special characters such as <, >, or &, which are required for XSS injection.

  Why are the other options incorrect?

  Option A: Restricts input to a Social Security Number (SSN) format ([0-9]{3}-[0- 9]{2}-[0-9]{4}). While it prevents JavaScript injection, it is too restrictive and would break legitimate text-based content in the XML.

  Option C: Restricts input to only numeric values ([0-9]*), preventing JavaScript injection but also breaking legitimate non-numeric content in the <description> field.

  Option D: Restricts input to a single positive integer, which does not align with the expected text-based content.

  Thus, Option B is the correct answer, as it enforces proper input validation while still allowing expected text input.

• Question 669:

  A security administrator needs to import PII data records from the production environment to the test environment for testing purposes.

  Which of the following would best protect data confidentiality?

  A. Data masking
  B. Hashing
  C. Watermarking
  D. Encoding
  A. Data masking

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  Explanation

  Data masking is a technique that replaces sensitive data with fictitious or anonymized data, while preserving the original format and structure of the data. This way, the data can be used for testing purposes without revealing the actual Pll information. Data masking is one of the best practices for data analysis of confidential data 1.

  References:

  CompTIA CySA+ CS0-003 Certification Study Guide, page 343

  Best Practices for Data Analysis of Confidential Data

• Question 670:

  A security analyst has prepared a vulnerability scan that contains all of the company's functional subnets. During the initial scan, users reported that network printers began to print pages that contained unreadable text and icons.

  Which of the following should the analyst do to ensure this behavior does not oocur during subsequent vulnerability scans?

  A. Perform non-credentialed scans.
  B. Ignore embedded web server ports.
  C. Create a tailored scan for the printer subnet.
  D. Increase the threshold length of the scan timeout.
  C. Create a tailored scan for the printer subnet.

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  Explanation

  The best way to prevent network printers from printing pages during a vulnerability scan is to create a tailored scan for the printer subnet that excludes the ports and services that trigger the printing behavior. The other options are not effective for this purpose: performing non-credentialed scans may not reduce the impact on the printers; ignoring embedded web server ports may not cover all the possible ports that cause printing; increasing the threshold length of the scan timeout may not prevent the printing from occurring.

  References:

  According to the CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition1, one of the objectives for the exam is to "use appropriate tools and methods to manage, prioritize and respond to attacks and vulnerabilities". The book also covers the usage and syntax of vulnerability scanning tools, such as Nessus, Nmap, and Qualys, in chapter 4. Specifically, it explains the meaning and function of each component in vulnerability scanning, such as credentialed vs. non-credentialed scans, port scanning, and scan scheduling1, pages 149-160. It also discusses the common issues and challenges of vulnerability scanning, such as network disruptions, false positives, and scan scope1, pages 161-162.

  Therefore, this is a reliable source to verify the answer to the question.