CS0-003 Exam Dumps - CompTIA CySA+ Questions and Answers

An unintentional insider threat is a type of network security threat that occurs when a legitimate user of the network unknowingly exposes the network to malicious activity, such as opening a phishing email or a malware-infected attachment from an unknown source. This can compromise the network security and allow attackers to access sensitive data or systems. The other options are not related to the threat concept of ensuring that all network users only open attachments from known sources.

ReferencesCompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 1: Threat and Vulnerability Management, page 13.What is Network Security | Threats, Best Practices | Imperva, Network Security Threats and Attacks, Phishing section.Five Ways to Defend Against Network Security Threats, 2. Use Firewalls section.

ISO 27001 is an international standard that establishes a framework for implementing, maintaining, and improving an information security management system (ISMS). It helps organizations demonstrate their commitment to protecting their data and complying with various regulations and best practices. The other options are not relevant for this purpose: PCI DSS is a standard that focuses on protecting payment card data; COBIT is a framework that provides guidance on governance and management of enterprise IT; ITIL is a framework that provides guidance on service management and delivery.

Registry key values would be missing from a scan performed with this configuration, as the scanner appliance would not have access to the Windows Registry of the scanned systems. The WindowsRegistry is a database that stores configuration settings and options for the operating system and installed applications. To scan the Registry, the scanner would need to have credentials to log in to the systems and run a local agent or script. The other items would not be missing from the scan, as they can be detected by the scanner appliance without credentials. Operating system version can be identified by analyzing service banners or fingerprinting techniques. Open ports can be discovered by performing a port scan or sending probes to common ports. IP address can be obtained by resolving the hostname or using network discovery tools. https://attack.mitre.org/techniques/T1112/

The signature of the malware is a unique identifier that can be used to compare it with known malware samples and their behaviors. Open-source threat intelligence sources provide information on various types of malware, their indicators of compromise, and their mitigation strategies. By cross-referencing the signature with these sources, the analyst can determine the type of malware and its telemetry. The other options are not relevant for this purpose: configuring the EDR to perform a full scan may not provide additional information on the malware type; transferring the malware to a sandbox environment may expose the analyst to further risks; logging in to the affected systems and running netstat may not reveal the malware activity.

An incident manager should work with the legal and public relations entities to ensure correct processes are adhered to when communicating incident reporting to the general public, as a best practice. The legal entity can provide guidance on the legal implications and obligations of disclosing the incident, such as compliance with data protection laws, contractual obligations, and liability issues. The public relations entity can help craft the appropriate message and tone for the public communication, as well as manage the reputation and image of the organization in the aftermath of the incident. These two entities can help the incident manager balance the need for transparency and accountability with the need for confidentiality and security12. References: Incident Communication Templates, Incident Management: Processes, Best Practices & Tools - Atlassian

The correct answer is A because CVSS severity alone is not enough to confirm remediation priority. The vulnerability manager needs to know the criticality of the affected hosts/assets. For example, a slightly lower CVSS vulnerability on a public-facing, business-critical system may require faster remediation than a higher CVSS vulnerability on a low-value internal system.

The CySA+ All-in-One guide states that remediation priority should consider exploitability, whether a vulnerability is weaponized, patch availability, and asset value and criticality. It also explains that analysts must consider business impact when deciding how to remediate vulnerabilities.

The Secbay CySA+ guide also explains that vulnerability prioritization should evaluate severity, exploitability, and the criticality of affected systems, including business operations, data sensitivity, and regulatory impact.

Why the other options are incorrect:

B is incorrect because SLA information determines remediation timelines after priority is established.

C is incorrect because KPIs measure performance, not asset priority.

D is incorrect because the scenario does not state these are zero-day vulnerabilities.

The correct answers are A. System criticality and D. Threat intelligence.

A company may reprioritize a vulnerability score when the affected system is more important to the business than the raw CVSS score alone indicates. A vulnerability on a business-critical system may receive higher priority than the same vulnerability on a low-value system. The CySA+ materials state that vulnerabilities may be prioritized based on system criticality, including the critical nature of the data processed and the business processes that use the host.

Threat intelligence can also cause reprioritization. If intelligence shows that a vulnerability is being actively exploited in the wild or targeted by relevant threat actors, the organization should raise its priority even if the base vulnerability score is not the highest. The Secbay CySA+ guide states that organizations should incorporate threat intelligence to understand the current threat landscape and prioritize vulnerabilities actively exploited in the wild.

Why the other options are incorrect:

B. Alert volume is an incident response or monitoring metric, not a direct reason to reprioritize a vulnerability score.

C. Unexpected outage may affect operations, but it is not a standard vulnerability score reprioritization factor.

E. Patch availability affects remediation planning and timing, but the two strongest score-reprioritization factors in this question are asset/system criticality and threat intelligence.

F. Public relations may affect communications strategy after an incident, but it is not a core vulnerability prioritization factor.

The correct answer is B because this is a critical infrastructure / ICS / OT environment. The safest option listed is a targeted, low-impact banner-grabbing approach against the known standard ports: TCP 80 for HTTP and TCP 502 for Modbus. In critical infrastructure, the analyst should avoid aggressive or broad scanning methods that could disrupt fragile industrial systems.

Exact supporting extract: the Secbay CySA+ guide states that vulnerability scanning of OT environments, including ICS and SCADA systems, requires specialized tools and methodologies because these environments have unique security requirements and constraints. It also states that vulnerabilities in ICS can have severe operational and safety implications.

The same guide explains that Modbus is a protocol used in industrial control systems and enables communication among devices connected to the same network.

The Sybex CySA+ Study Guide explains that service identification may be done by connecting and grabbing the banner or connection information provided by the service. It also explains that Nmap can perform service and version detection, but the more aggressive options are less appropriate for sensitive ICS environments.

Why the other options are incorrect:

A is incorrect because a general IT vulnerability scanner may be too intrusive for an oil and gas pipeline ICS environment.

C is incorrect because -A enables aggressive Nmap detection features, which may include OS detection, version detection, scripts, and traceroute. That is riskier in ICS/OT environments.

D is incorrect because Masscan is designed for high-speed scanning and is inappropriate for sensitive critical infrastructure networks.

B is best because it targets only the known ports and uses a less aggressive identification method.

A “network data closet” attack is a physical-environment incident (hardware, cabling, physical access/tampering). Proper documentation in such cases includes documenting the scene and physical state of impacted items so that investigators can reconstruct what was present, what was changed, and how things were connected.

The All-in-One CySA+ guide explicitly states that an important step is documenting the physical environment and that an easy way is to take lots of photos of the scene:

Exact extract (All-in-One Exam Guide):

“Another important… step is to document the entire physical environment around a device. An easy way to do this is to take lots of photos of the scene.”

Why the other options are less correct:

A is a recovery/ops task, not primary incident documentation of a physical attack scene.

B may be useful in some contexts, but the best practice for a physical incident scene is to photograph impacted items and surroundings.

C can help later, but it’s not the first/best documentation action for a physical tampering incident compared to capturing the scene as-found.

The output shows that the web application has a cross-origin resource sharing (CORS) header that allows any origin to access its resources. This is a security misconfiguration that could allow malicious websites to make requests to the web application on behalf of the user and access sensitive data or perform unauthorized actions. The tuning recommendation is to configure the Access-Control-Allow-Origin header to only allow authorized domains that need to access the web application’s resources. This would prevent unauthorized cross-origin requests and reduce the risk of cross-site request forgery (CSRF) attacks.