CS0-003 Practice Test 10 — 10 Questions

Question 1

A small business with 50 employees uses a single Windows Server 2019 as a domain controller and file server. The company recently experienced a ransomware attack that encrypted all files on the server. The IT manager restored the files from a backup that was taken two days before the attack. However, the next day, the files were encrypted again. The analyst suspects the ransomware may have persisted or re-entered. The network is air-gapped from the internet, but employees use USB drives. Which of the following is the MOST likely reason for the re-infection?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

An employee inserted an infected USB drive after the restoration.. The network is air-gapped from the internet, leaving USB drives as the primary vector for reintroducing malware. If an employee inserted an infected USB drive after the restoration, the ransomware could execute and re-encrypt the files. The air-gap eliminates internet-based re-entry, and the backup was clean since it restored files without immediate re-encryption until the next day.

Answer

The backup itself contained the ransomware.

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The ransomware was still active in memory on the server.

Answer

The domain controller was not fully patched.

Question 2

An organization uses automated patch management for workstations but manual patching for servers. After a critical vulnerability is announced, the security team wants to expedite patching for servers. Which of the following is the BEST approach?

Accepted Answer

Test the patch in a staging environment and then deploy. Testing the patch in a staging environment before deploying to production servers validates compatibility and stability, reducing the risk of service disruption. This approach balances the urgency of a critical vulnerability with the need to maintain server availability, which is especially important given that manual patching is the standard procedure for servers. Staging allows the security team to identify any conflicts with existing configurations or dependencies before widespread deployment.

Answer

Disable the affected services until the patch can be applied

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Deploy the patch immediately to all servers

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Implement virtual patching via an IPS

Question 3

A security analyst is conducting a vulnerability assessment of a web application. The assessment reveals that the application is vulnerable to SQL injection. Which of the following is the MOST effective remediation?

Accepted Answer

Use parameterized queries in the application code. Parameterized queries (also known as prepared statements) are the most effective remediation for SQL injection because they separate SQL logic from user-supplied data by using placeholders. The database engine treats the input strictly as data, not executable code, which prevents an attacker from altering the query structure. This addresses the root cause at the application layer, unlike other controls that only mitigate or detect the attack.

Answer

Upgrade the web application framework to the latest version

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Deploy a web application firewall (WAF)

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Implement client-side input validation

Question 4

During a vulnerability scan, an analyst discovers a high-severity vulnerability on a critical database server. The server is in production and cannot be taken offline. The vendor has released a patch but requires a reboot. Which of the following should the analyst recommend FIRST?

Accepted Answer

Schedule the patch during the next maintenance window.. The database server is in production and cannot be taken offline, so the patch must be applied during a scheduled maintenance window to minimize business disruption. The vulnerability is high-severity, but the vendor requires a reboot, which would cause downtime; therefore, the first step is to plan the patch application at the next available maintenance window, not to apply it immediately or implement a workaround that may not fully mitigate the risk.

Answer

Implement a workaround from the vendor.

Answer

Apply the patch immediately.

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Migrate the database to a new server.

Question 5

A security dashboard is being designed for the executive team. Which metric is MOST appropriate to display?

Accepted Answer

Overall risk posture score with trend over time. The executive team requires a high-level, strategic view of security effectiveness, not granular operational data. The overall risk posture score with trend over time directly communicates the organization's security health and whether it is improving or deteriorating, enabling informed decision-making. This aligns with the Reporting and Communication domain's emphasis on translating technical metrics into business-relevant insights.

Answer

Current CPU utilization on firewalls

Answer

Patch installation status of all endpoints

Answer

Number of IDS alerts per hour

Question 6

A cloud security posture tool reports public access on object storage. Which follow-up checks matter? (Choose two.)

Accepted Answer

Whether sensitive objects were accessed or downloaded. The primary concern with public access to object storage is data exposure. Checking whether sensitive objects were accessed or downloaded determines if a breach actually occurred, which is a critical follow-up step in vulnerability management. Without this check, you cannot assess the real-world impact of the misconfiguration.

Answer

Whether the storage account name is short

Answer

Whether the administrator uses dark mode

Question 7

A security analyst has identified a critical vulnerability in a customer-facing web application. The analyst needs to communicate this to senior management. Which of the following is the best approach for this communication?

Accepted Answer

Summarize the vulnerability in terms of business risk, potential financial impact, and recommended mitigation timeline.. Communicating a critical vulnerability to senior management requires translating technical risk into business impact. Security analysts must present findings in terms of potential financial loss, regulatory consequences, and a clear mitigation timeline, enabling informed decision-making without requiring deep technical expertise.

Answer

Send a brief email stating that a critical vulnerability exists and ask management to schedule a meeting.

Answer

Notify the development team only and have them fix it before informing management.

Answer

Provide a detailed technical analysis of the vulnerability, including exploit code.

Question 8

A security analyst is configuring a container image scanning tool. Which of the following tools is specifically designed for container image vulnerability scanning?

Accepted Answer

Trivy. Trivy is an open-source, purpose-built vulnerability scanner for container images, filesystems, and Git repositories. It scans OS packages (e.g., Alpine apk, Debian dpkg) and language-specific dependencies (npm, pip, Maven) inside an image and reports CVEs with severity ratings. Unlike general-purpose scanners, Trivy understands image layers and package manifests, making it the tool specifically designed for container image scanning in this list.

Answer

Nessus

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Burp Suite

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OpenVAS

Question 9

After containing a ransomware outbreak, the incident response team needs to restore encrypted files. They have verified clean backups from two weeks ago, but some critical files were modified on the day of the attack. What is the best approach?

Accepted Answer

Restore critical files from backup and manually update them using change logs. Restoring critical files from backup and manually updating them using change logs preserves the modifications made on the day of the attack, which are not present in the two-week-old backups. This approach ensures data integrity by combining the clean baseline from backups with the legitimate changes recorded in change logs, avoiding data loss while maintaining security.

Answer

Restore from backups and then apply all available updates

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Attempt to decrypt files using the ransom key

Answer

Restore all files from backups

Question 10

Your organization has deployed a new web application on a Linux server. The application uses a custom database port (TCP 3307). During a routine vulnerability scan, the scanner reports a critical vulnerability: 'MySQL Server - Unrestricted File Upload (CVE-20XX-XXXX)'. The system administrator confirms that MySQL is not installed; the custom database uses PostgreSQL on port 3307. The scanner likely misidentified the service due to port-based fingerprinting. On further investigation, you find that the scanner's fingerprinting database has an incorrect mapping for port 3307. The PostgreSQL version is current and fully patched. The environment is production and cannot be disrupted. Which of the following is the BEST action to take?

Accepted Answer

Mark the vulnerability as a false positive and suppress it for this asset.. The vulnerability report is based on a false positive: the scanner misidentified the service on port 3307 as MySQL due to an incorrect port mapping in its fingerprinting database, while the actual service is a fully patched PostgreSQL. Since MySQL is not installed and no actual vulnerability exists, marking the finding as a false positive and suppressing it for this asset is the appropriate response in a production environment that cannot be disrupted.

Answer

Manually update the scanner's database to correct the port mapping.

Answer

Schedule an immediate patch of the supposed MySQL vulnerability.

Answer

Apply a workaround to block file upload functionality on port 3307.