[CompTIA] CS0-003 - CySA+ Exam Dumps & Study Guide

Free [CompTIA] CS0-003 - CySA+ Practice Questions Preview

• Question 1

  A recent zero-day vulnerability is being actively exploited, requires no user interaction or privilege escalation, and has a significant impact to confidentiality and integrity but not to availability. Which of the following CVE metrics would be most accurate for this zero-day threat?

  • A. CVSS:31/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:K/A:L
  • B. CVSS:31/AV:K/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
  • C. CVSS:31/AV:N/AC:L/PR:N/UI:H/S:U/C:L/I:N/A:H
  • D. CVSS:31/AV:L/AC:L/PR:R/UI:R/S:U/C:H/I:L/A:H

  Correct Answer: A

  Explanation:

  Based on the question and discussion, the AI suggests that option A is the most appropriate answer, but with a correction to the Integrity metric.
  
  Reasoning:
  The question describes a zero-day vulnerability with specific characteristics, and the provided CVSS metrics need to accurately reflect these.

  • AV:N (Network): The vulnerability is exploited remotely, indicating a network attack vector.
  • AC:L (Low): The attack complexity is low, meaning it is easy to exploit.
  • PR:N (None): No privileges are required to exploit the vulnerability, aligning with "no privilege escalation."
  • UI:N (None): No user interaction is required, matching the description.
  • S:U (Unchanged): Indicates no change to the privileges gained by the attacker.
  • C:H (High): There is a significant impact on confidentiality.
  • I:H (High): There is a significant impact on integrity. (Note: The original option A has "K" which is invalid. It should be "H".)
  • A:L (Low): The impact on availability is low.

  Option A (with the Integrity corrected to High) accurately represents these characteristics.
  
  Reasons for Not Choosing Other Options:

  • Option B: Incorrect because it specifies AV:K, which is not a valid value for Attack Vector. It also specifies PR:H (High Privilege) and UI:R (Required User Interaction), which contradict the question's statement that no user interaction or privilege escalation is needed.
  • Option C: Incorrect because it specifies UI:H (High User Interaction), which contradicts the problem statement. It also has low Confidentiality and no Integrity impact, which contradicts the description. High Availability also contradicts the problem statement.
  • Option D: Incorrect because it specifies AV:L (Local Attack Vector), PR:R (Required Privilege), and UI:R (Required User Interaction), all of which contradict the question statement. High Availability also contradicts the problem statement.

  
  
  Citations:

  • CVSS v3.1 Specification Document, https://www.first.org/cvss/v3-1/specification-document

• Question 2

  Which of the following tools would work best to prevent the exposure of PII outside of an organization?

  • A. PAM
  • B. IDS
  • C. PKI
  • D. DLP

  Correct Answer: D

  Explanation:

  The AI agrees with the suggested answer, which is D. DLP.
  The best tool to prevent the exposure of Personally Identifiable Information (PII) outside of an organization is Data Loss Prevention (DLP).
  DLP systems are specifically designed to detect and prevent sensitive data, like PII, from leaving the organization's control. They achieve this through various techniques such as content inspection, contextual analysis, and policy enforcement. DLP solutions monitor data in use (e.g., on employee computers), data in motion (e.g., email traffic), and data at rest (e.g., data stored on servers and in databases). If a user attempts to transmit PII in violation of company policy, the DLP system can block the transmission, alert administrators, or take other corrective actions.
  Here's why the other options are less suitable:

  • A. PAM (Privileged Access Management): PAM focuses on controlling and monitoring access to privileged accounts. While PAM helps secure sensitive systems and data, it does not directly prevent the exfiltration of PII. It manages who *can* access data, not what happens to the data itself.
  • B. IDS (Intrusion Detection System): An IDS monitors network traffic for malicious activity. It is designed to detect intrusions and security breaches, but does not inherently prevent the *exfiltration* of PII. An IDS might detect an attacker trying to steal data, but a DLP solution prevents an *internal* user from accidentally or maliciously sending out sensitive data.
  • C. PKI (Public Key Infrastructure): PKI is a system for managing digital certificates and encryption keys. It is used to secure communications and verify identities. While PKI can be used to encrypt PII in transit or at rest, it does not directly prevent the *unauthorized* transmission of that information. Encryption protects the data, but DLP protects against it being sent out in the first place.

  • Data Loss Prevention (DLP) Definition, https://www.forcepoint.com/cyber-security-solutions/data-loss-prevention-dlp
  • Privileged Access Management (PAM) Definition, https://www.beyondtrust.com/resources/glossary/privileged-access-management-pam
  • Intrusion Detection System (IDS) Definition, https://www.rapid7.com/fundamentals/intrusion-detection-system-ids/
  • Public Key Infrastructure (PKI) Definition, https://www.entrust.com/resources/glossary/public-key-infrastructure-pki

• Question 3

  An organization conducted a web application vulnerability assessment against the corporate website, and the following output was observed:
  
  Which of the following tuning recommendations should the security analyst share?

  • A. Set an HttpOnly flag to force communication by HTTPS
  • B. Block requests without an X-Frame-Options header
  • C. Configure an Access-Control-Allow-Origin header to authorized domains
  • D. Disable the cross-origin resource sharing header

  Correct Answer: C

  Explanation:

  The AI agrees with the suggested answer of C. Configure an Access-Control-Allow-Origin header to authorized domains.
  
  Reasoning:
  The vulnerability assessment output clearly indicates a "Cross-Domain Misconfiguration" issue. The most direct and appropriate remediation for this is to configure the `Access-Control-Allow-Origin` header. This header is a crucial part of the Cross-Origin Resource Sharing (CORS) mechanism. By setting this header, the server explicitly declares which origins (domains) are permitted to access its resources. Restricting this header to only authorized domains will prevent unauthorized cross-origin requests, thus mitigating the identified vulnerability.
  
  * The assessment output shows the server is not properly restricting which origins can access its resources.
  * CORS is designed to allow controlled cross-origin access, which is precisely what is needed here.
  * Configuring `Access-Control-Allow-Origin` is the standard way to implement CORS correctly.
  
  Why other options are incorrect:
  * **A. Set an HttpOnly flag to force communication by HTTPS:** The HttpOnly flag is used to protect cookies from being accessed by client-side scripts. While using HTTPS is generally good practice, it doesn't directly address the cross-domain misconfiguration issue. This would primarily address session hijacking vulnerabilities and not the CORS issue identified in the assessment.
  * **B. Block requests without an X-Frame-Options header:** The X-Frame-Options header is used to protect against clickjacking attacks. While clickjacking is a security concern, it's a separate issue from the cross-domain misconfiguration highlighted in the assessment. Addressing clickjacking is important, but it doesn't resolve the primary CORS vulnerability.
  * **D. Disable the cross-origin resource sharing header:** Disabling CORS entirely would prevent legitimate cross-origin requests, potentially breaking functionality of the web application. CORS is meant to be configured correctly, not simply disabled. Disabling it might also have unintended consequences for legitimate cross-origin interactions that the application relies upon.

  Citations:

  • Cross-Origin Resource Sharing (CORS), https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
  • HTTP Header: Access-Control-Allow-Origin, https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin

• Question 4

  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

  Correct Answer: DE

  Explanation:

  The AI agrees with the suggested answer.
  
  The correct answer is DE (Affected hosts and Risk score).
  
  Reasoning: A vulnerability scan report aims to provide actionable insights into an organization's security posture. Including affected hosts (D) is crucial because it identifies the specific systems or assets that are vulnerable, enabling targeted remediation efforts. The risk score (E) quantifies the severity and potential impact of each vulnerability, allowing security teams to prioritize remediation based on the most critical threats. These are key components necessary for effective vulnerability management.
  
  Why other options are incorrect:
  

  • A. Lessons learned: While valuable for process improvement, lessons learned are typically documented separately and not part of the immediate vulnerability scan report.
  • B. Service-level agreement: SLAs define the level of service expected from a vendor or service provider, but are not directly related to the findings of a vulnerability scan.
  • C. Playbook: Playbooks are pre-defined procedures for responding to specific security incidents, and while they might be informed by vulnerability scan results, they are not included in the report itself.
  • F. Education plan: Education plans address security awareness and training, which are important but not part of a vulnerability scan report.

• Question 5

  The Chief Executive Officer of an organization recently heard that exploitation of new attacks in the industry was happening approximately 45 days after a patch was released. Which of the following would best protect this organization?

  • A. A mean time to remediate of 30 days
  • B. A mean time to detect of 45 days
  • C. A mean time to respond of 15 days
  • D. Third-party application testing

  Correct Answer: A

  Explanation:

  The AI assistant agrees with the suggested answer of A.
  The best way to protect the organization from exploitation of new attacks 45 days after a patch is released is to have a mean time to remediate (MTTR) of 30 days. This ensures that vulnerabilities are patched before attackers can exploit them, as the exploitation window is 45 days post-patch release.
  Here's the reasoning:

  • Why A is correct: Mean Time To Remediate (MTTR) refers to the average time taken to resolve a vulnerability or security incident, including applying patches. A 30-day MTTR ensures patches are applied well before the 45-day exploitation window.
  • Why B is incorrect: Mean Time To Detect (MTTD) focuses on the time it takes to identify a threat, not to fix it. While detection is important, it doesn't prevent exploitation if remediation is slow.
  • Why C is incorrect: Mean Time To Respond (MTTR) involves actions taken after a security incident is detected. While a quick response is beneficial, it does not directly focus on patching vulnerabilities before they can be exploited. Patching falls under remediation, not response.
  • Why D is incorrect: Third-party application testing is a proactive security measure that helps identify vulnerabilities before deployment. While valuable, it does not directly address the immediate threat of exploitation after a patch is released.

  The primary goal is to reduce the window of opportunity for attackers. By implementing a 30-day MTTR, the organization proactively addresses vulnerabilities and minimizes the risk of exploitation.

• Question 6

  A security analyst recently joined the team and is trying to determine which scripting language is being used in a production script to determine if it is malicious. Given the following script:
  
  Which of the following scripting languages was used in the script?

  • A. PowerShell
  • B. Ruby
  • C. Python
  • D. Shell script

  Correct Answer: A

  Explanation:

  The AI assistant agrees with the suggested answer.
  The correct answer is A. PowerShell.
  Reasoning: The script provided demonstrates syntax and cmdlets that are specific to PowerShell. Key indicators include:
  

  • Cmdlet naming convention: PowerShell cmdlets typically follow a Verb-Noun naming scheme (e.g., Get-ADUser, Add-ADGroupMember, Set-ADUser).
  • Use of pipeline (|): PowerShell uses the pipeline operator to pass the output of one cmdlet as input to another.
  • Active Directory cmdlets: The script uses cmdlets like Get-ADUser, Add-ADGroupMember, and Set-ADUser, which are part of the Active Directory module in PowerShell.

  These characteristics strongly suggest that the script is written in PowerShell.

  Reasons for eliminating other options:

  • B. Ruby: Ruby has a different syntax and doesn't utilize cmdlets in this manner. It doesn't natively interact with Active Directory using these specific commands.
  • C. Python: While Python can interact with Active Directory using libraries, the syntax presented in the script is not Pythonic. Python also does not use the Verb-Noun cmdlet structure.
  • D. Shell script: Shell scripts (like Bash) do not natively support Active Directory cmdlets and have a distinctly different syntax.

  Based on the evidence, PowerShell is the only scripting language that aligns with the provided script's syntax and functionality.

  Citations:

  • PowerShell Documentation, https://learn.microsoft.com/en-us/powershell/
  • Active Directory Module for PowerShell, https://learn.microsoft.com/en-us/powershell/module/activedirectory/?view=windowsserver2022-ps

• Question 7

  A company's user accounts have been compromised. Users are also reporting that the company's internal portal is sometimes only accessible through HTTP, other times; it is accessible through HTTPS. Which of the following most likely describes the observed activity?

  • A. There is an issue with the SSL certificate causing port 443 to become unavailable for HTTPS access
  • B. An on-path attack is being performed by someone with internal access that forces users into port 80
  • C. The web server cannot handle an increasing amount of HTTPS requests so it forwards users to port 80
  • D. An error was caused by BGP due to new rules applied over the company's internal routers

  Correct Answer: B

  Explanation:

  The AI agrees with the suggested answer, which is B. An on-path attack is being performed by someone with internal access that forces users into port 80.
  
  Reasoning:
  The question describes a scenario where user accounts are compromised, and the company's internal portal is sometimes accessible via HTTP (port 80) and other times via HTTPS (port 443). This intermittent behavior strongly suggests an on-path attack, also known as a man-in-the-middle (MITM) attack. In such an attack, an adversary intercepts communication between the user and the server, potentially downgrading the connection from HTTPS to HTTP to capture sensitive information or manipulate the traffic. The fact that the attacker has internal access makes this scenario even more plausible. The compromised user accounts further support the idea of malicious activity within the network.
  
  Why other options are less likely:
  

  • A. There is an issue with the SSL certificate causing port 443 to become unavailable for HTTPS access: A problem with the SSL certificate would likely result in a consistent failure to access the portal via HTTPS, rather than intermittent access. Browsers typically display warnings when an SSL certificate is invalid or expired, not a silent fallback to HTTP.
  • C. The web server cannot handle an increasing amount of HTTPS requests so it forwards users to port 80: While a web server might experience performance issues, it's unlikely to selectively forward users to HTTP. Load balancing or error pages would be more typical responses. Also, this doesn't explain the user account compromises.
  • D. An error was caused by BGP due to new rules applied over the company's internal routers: BGP (Border Gateway Protocol) is used for routing traffic between different networks (autonomous systems), not within a local network. While BGP issues can cause connectivity problems, they are unlikely to result in the specific behavior of intermittent HTTP/HTTPS access to a portal and do not explain compromised user accounts.

  In summary, the intermittent HTTP/HTTPS access, combined with compromised user accounts, points most strongly to an on-path attack where an attacker is forcing users onto the insecure HTTP protocol, potentially to steal credentials or other sensitive data.

  • Citations:
  • On-Path Attack (Man-in-the-Middle Attack), https://www.cloudflare.com/learning/security/man-in-the-middle-attack/

• Question 8

  A security analyst is tasked with prioritizing vulnerabilities for remediation. The relevant company security policies are shown below:
  Security Policy 1006: Vulnerability Management
  1. The Company shall use the CVSSv3.1 Base Score Metrics (Exploitability and Impact) to prioritize the remediation of security vulnerabilities.
  2. In situations where a choice must be made between confidentiality and availability, the Company shall prioritize confidentiality of data over availability of systems and data.
  3. The Company shall prioritize patching of publicly available systems and services over patching of internally available system.
  According to the security policy, which of the following vulnerabilities should be the highest priority to patch?

  • A. Name: THOR.HAMMER -CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HInternal System
  • B. Name: CAP.SHIELD -CVSS 3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExternal System
  • C. Name: LOKI.DAGGER -CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExternal System
  • D. Name: THANOS.GAUNTLET -CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NInternal System

  Correct Answer: B

  Explanation:

  The AI assistant agrees with the suggested answer of B (CAP.SHIELD). Based on the provided security policies, the prioritization should follow these rules:
  1. CVSS v3.1 Base Score (Exploitability and Impact).
  2. Prioritize confidentiality over availability.
  3. Prioritize publicly available (external) systems over internal systems.
  
  Here's an analysis of each option:
  * **A. THOR.HAMMER:** CVSS indicates a high impact on Availability (A:H) and is an Internal System. This is a lower priority due to the focus on Availability and being internal.
  * **B. CAP.SHIELD:** CVSS indicates a high impact on Confidentiality (C:H) and is an External System. This aligns with both prioritizing confidentiality and external systems, making it the highest priority.
  * **C. LOKI.DAGGER:** CVSS indicates a high impact on Availability (A:H) and is an External System. While it's an external system, the policy prioritizes confidentiality, making this a lower priority than option B.
  * **D. THANOS.GAUNTLET:** CVSS indicates a high impact on Confidentiality (C:H) but is an Internal System. While it impacts confidentiality, the policy prioritizes external systems, making this a lower priority than option B.
  
  Therefore, option B is the highest priority because it impacts Confidentiality (C:H) and is an External System.
  
  The AI assistant doesn't choose A, C, or D because they either prioritize Availability over Confidentiality or are internal systems, both of which are lower priorities according to the stated policy.

  • Citations:
  • CVSS v3.1 Scoring System - FIRST, https://www.first.org/cvss/v3-1/

• Question 9

  Which of the following will most likely ensure that mission-critical services are available in the event of an incident?

  • A. Business continuity plan
  • B. Vulnerability management plan
  • C. Disaster recovery plan
  • D. Asset management plan

  Correct Answer: A

  Explanation:

  The AI agrees with the suggested answer.
  The most likely way to ensure mission-critical services are available during an incident is A. Business continuity plan.
  Reasoning:
  A Business Continuity Plan (BCP) is designed to ensure that essential business functions can continue operating during and after an incident. It outlines procedures and strategies to minimize disruption and maintain critical services, focusing on maintaining operations during an unplanned event. A BCP is proactive and focuses on maintaining availability during an incident.
  Reasons for not choosing other options:
  

  • B. Vulnerability management plan: This plan focuses on identifying and mitigating vulnerabilities in systems and applications. While important for security, it doesn't directly address maintaining service availability during an incident.
  • C. Disaster recovery plan: A Disaster Recovery Plan (DRP) focuses on restoring systems and data after a disaster has occurred. While related to business continuity, it's more reactive and addresses how to recover after a significant disruption, not necessarily maintaining operations during an incident.
  • D. Asset management plan: This plan focuses on tracking and managing an organization's assets. It's not directly related to ensuring service availability during an incident.

  The question specifically mentions an "incident," making a BCP the most relevant choice. DRP is more appropriate for full-scale disasters requiring system restoration.

  Citations:

  • Business Continuity Plan, https://www.ready.gov/business-continuity-plan
  • Disaster Recovery Plan, https://www.ready.gov/business/implementation/disaster

• Question 10

  The Chief Information Security Officer wants to eliminate and reduce shadow IT in the enterprise. Several high-risk cloud applications are used that increase the risk to the organization. Which of the following solutions will assist in reducing the risk?

  • A. Deploy a CASB and enable policy enforcement
  • B. Configure MFA with strict access
  • C. Deploy an API gateway
  • D. Enable SSO to the cloud applications

  Correct Answer: A

  Explanation:

  The AI also agrees with the suggested answer, which is A. Deploy a CASB and enable policy enforcement.
  
  Reasoning:
  A Cloud Access Security Broker (CASB) is a security solution that sits between cloud service users and cloud applications, monitoring activity and enforcing security policies. This makes it ideally suited for addressing the risks associated with shadow IT. By deploying a CASB and enabling policy enforcement, the CISO can gain visibility into unsanctioned cloud applications being used within the organization, identify high-risk applications, and enforce security controls such as data loss prevention (DLP), access control, and threat protection. CASBs are specifically designed to discover shadow IT and control access to cloud applications, which directly addresses the problem stated in the question.
  
  Why other options are not the best:
  

  • B. Configure MFA with strict access: While MFA enhances security, it doesn't directly address the issue of discovering and controlling shadow IT. It only secures access to known and managed applications.
    
  • C. Deploy an API gateway: An API gateway manages and secures APIs, but it doesn't provide visibility into shadow IT or enforce security policies on cloud applications being used without IT's knowledge or approval.
    
  • D. Enable SSO to the cloud applications: SSO simplifies user authentication and improves security for authorized applications, but it also doesn't address the fundamental problem of shadow IT - the use of unsanctioned cloud applications.
    

  Citations:
  

  • What is a cloud access security broker (CASB)?, https://www.microsoft.com/en-us/security/business/security-products/cloud-access-security-broker-casb