47. An administrator discovers a cross-site scripting vulnerability on a company website. Which of the following will most likely remediate the issue?
Answer: D
The most effective remediation for a cross-site scripting vulnerability is the implementation of a Web Application Firewall (WAF).
A Web Application Firewall (WAF) can effectively filter and monitor HTTP traffic to and from a web application, providing protection against cross-site scripting (XSS) attacks by blocking malicious scripts before they reach the user.
A) Input validation
Input validation is an important security measure that helps to prevent various types of vulnerabilities, including XSS, by ensuring that only properly formatted data is accepted. However, while it is a crucial part of a secure coding practice, it may not fully remediate an existing XSS vulnerability already present in the application. Input validation alone does not provide real-time protection against attacks.
B) NGFW
Next-Generation Firewalls (NGFW) focus on network-level security and may include features like intrusion prevention and application awareness. However, NGFWs are primarily designed to protect the network perimeter and might not specifically address vulnerabilities within web applications, such as XSS. Therefore, while they enhance overall security, they are not the most effective solution for remediating XSS vulnerabilities.
C) Vulnerability scan
A vulnerability scan is a tool used to identify potential security weaknesses, including XSS vulnerabilities. While it can help discover the issue, it does not provide remediation on its own. The scan will indicate the presence of the vulnerability, but further action is necessary to fix the problem, which a WAF can actively enforce.
D) WAF
A Web Application Firewall (WAF) is specifically designed to protect web applications from various threats, including XSS. By analyzing incoming traffic and blocking malicious requests, a WAF can effectively mitigate the risk posed by XSS vulnerabilities. This proactive approach is essential for maintaining the security of web applications.
Conclusion
The implementation of a WAF is the most effective solution for remediating cross-site scripting vulnerabilities, as it actively filters and blocks malicious traffic aimed at exploiting such weaknesses. Other options, like input validation and vulnerability scans, serve important roles in web security but do not provide the real-time protection necessary to mitigate the specific risks associated with XSS attacks. Thus, a WAF stands out as the most comprehensive and effective measure in this scenario.