CS0-003 Exam Dumps - CompTIA CyberSecurity Analyst CySA+ Certification Exam

The correct answer is B. Rule to detect and block OS commands. A remote code execution attack allows an attacker to execute malicious code or operating system commands on a target system. Since the question asks what should be configured in a WAF, the best answer is a WAF rule that detects and blocks command-execution patterns, such as attempts to invoke shell commands, command separators, or dangerous OS-level functions.

Exact supporting extract: the All-in-One CySA+ guide states that remote code execution describes an attacker’s ability to execute malicious code on a target platform and may allow arbitrary command execution. It also lists application firewalls as a direct RCE mitigation because they monitor and filter traffic to an application and block suspicious or malicious traffic.

The Secbay CySA+ guide also explains that WAFs filter and monitor HTTP traffic between a web application and the internet, and that WAF rules are configured to block known attack patterns and common web application vulnerabilities.

Why the other options are incorrect:

A. Rate control in deny mode is more useful for throttling abuse, brute-force attempts, scraping, or denial-of-service-style traffic, not specifically RCE.

C. Parameterized queries are a strong mitigation for SQL injection, but they are implemented in application/database code, not configured in a WAF.

D. Stored procedure in the database is database-side logic and does not directly configure the WAF to detect or block RCE payloads.

B is best because RCE commonly involves malicious command execution, and the WAF should block those command patterns before they reach the application.

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.