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CompTIA CS0-003 Exam Sample Questions


Question # 1

A company is deploying new vulnerability scanning software to assess its systems. The current network is highly segmented, and the networking team wants to minimize the number of unique firewall rules. Which of the following scanning techniques would be most efficient to achieve the objective?
A. Deploy agents on all systems to perform the scans
B. Deploy a central scanner and perform non-credentialed scans
C. Deploy a cloud-based scanner and perform a network scan
D. Deploy a scanner sensor on every segment and perform credentialed scans


D. Deploy a scanner sensor on every segment and perform credentialed scans




Question # 2

Which Of the following techniques would be best to provide the necessary assurance for embedded software that drives centrifugal pumps at a power Plant?
A. Containerization
B. Manual code reviews
C. Static and dynamic analysis
D. Formal methods
E. D


D. Formal methods
According to the CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition1, the best technique to provide the necessary assurance for embedded software that drives centrifugal pumps at a power plant is formal methods. Formal methods are a rigorous and mathematical approach to software development and verification, which can ensure the correctness and reliability of critical software systems. Formal methods can be used to specify, design, implement, and verify embedded software using formal languages, logics, and tools1.
Containerization, manual code reviews, and static and dynamic analysis are also useful techniques for software assurance, but they are not as rigorous or comprehensive as formal methods. Containerization is a method of isolating and packaging software applications with their dependencies, which can improve security, portability, and scalability. Manual code reviews are a process of examining the source code of a software program by human reviewers, which can help identify errors, vulnerabilities, and compliance issues. Static and dynamic analysis are techniques of testing and evaluating
software without executing it (static) or while executing it (dynamic), which can help detect bugs, defects, and performance issues1.




Question # 3

A security analyst reviews the following Arachni scan results for a web application that stores PII data: Which of the following should be remediated first?
A. SQL injection
B. RFI
C. XSS
D. Code injection


A. SQL injection

Explanation:

SQL injection should be remediated first, as it is a high-severity vulnerability that can allow an attacker to execute arbitrary SQL commands on the database server and access, modify, or delete sensitive data, including PII. According to the Arachni scan results, there are two instances of SQL injection and three instances of blind SQL injection (two timing attacks and one differential analysis) in the web application. These vulnerabilities indicate that the web application does not properly validate or sanitize the user input before passing it to the database server, and thus exposes the database to malicious queries12. SQL injection can have serious consequences for the confidentiality, integrity, and availability of the data and the system, and can also lead to further attacks, such as privilege escalation, data exfiltration, or remote code execution34.

Therefore, SQL injection should be the highest priority for remediation, and the web application should implement input validation, parameterized queries, and least privilege principle to prevent SQL injection attacks5.

References:

Web application testing with Arachni | Infosec, How do I create a generated scan report for PDF in Arachni Web …, Command line user interface

• Arachni/arachni Wiki

• GitHub, SQL Injection - OWASP, Blind SQL Injection - OWASP, SQL Injection Attack: What is it, and how to prevent it., SQL Injection Cheat Sheet & Tutorial | Veracode




Question # 4

An attacker recently gained unauthorized access to a financial institution's database, which contains confidential information. The attacker exfiltrated a large amount of data before being detected and blocked. A security analyst needs to complete a root cause analysis to determine how the attacker was able to gain access. Which of the following should the
analyst perform first?
A. Document the incident and any findings related to the attack for future reference.
B. Interview employees responsible for managing the affected systems.
C. Review the log files that record all events related to client applications and user access.
D.
Identify the immediate actions that need to be taken to contain the incident and minimize
damage.


C. Review the log files that record all events related to client applications and user access.
In a root cause analysis following unauthorized access, the initial step is usually to review relevant log files. These logs can provide critical information about how and when the attacker gained access. The first step in a root cause analysis after a data breach is typically to review the logs. This helps the analyst understand how the attacker gained access by providing a detailed record of all events, including unauthorized or abnormal activities. Documenting the
incident, interviewing employees, and identifying immediate containment actions are important steps, but they usually follow the initial log review.




Question # 5

During a scan of a web server in the perimeter network, a vulnerability was identified that could be exploited over port 3389. The web server is protected by a WAF. Which of the following best represents the change to overall risk associated with this vulnerability?
A. The risk would not change because network firewalls are in use.
B. The risk would decrease because RDP is blocked by the firewall.
C. The risk would decrease because a web application firewall is in place.
D. The risk would increase because the host is external facing.


B. The risk would decrease because RDP is blocked by the firewall.
Port 3389 is commonly used by Remote Desktop Protocol (RDP), which is a service that allows remote access to a system. A vulnerability on this port could allow an attacker to compromise the web server or use it as a pivot point to access other systems. However, if the firewall blocks this port, the risk of exploitation is reduced.
References: CompTIA CySA+ CS0-003 Certification Study Guide, Chapter 2: Software and Systems Security, page 67; CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 3: Software and Systems Security, page 103



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