Exam PT0-003 Topic 1 Question 148 Discussion

Actual exam question for CompTIA's PT0-003 exam
Question #: 148
Topic #: 1
During a code review assessment, a penetration tester finds the following vulnerable code inside one of the web application files:
<% String id = request.getParameter("id"); %>
Employee ID: <%= id %>
Which of the following is the best remediation to prevent a vulnerability from being exploited, based on this code?

Suggested Answer: C Vote an answer

Output encoding is a technique that prevents cross-site scripting (XSS) attacks by encoding the user input before displaying it on the web page. This way, any malicious scripts or HTML tags are rendered harmless and cannot execute on the browser. Output encoding is recommended by the OWASP Top 10 as a defense against XSS1. In this case, the vulnerable code is using a scriptlet to display the employee ID without any validation or encoding, which could allow an attacker to inject malicious code through the id parameter.
Output encoding would prevent this by escaping any special characters in the id parameter. References: The Official CompTIA PenTest+ Student Guide (Exam PT0-002) eBook, Chapter 4, Section 4.2.1: Cross-site Scripting; Best PenTest+ certification study resources and training materials, Section 1: Cross-site Scripting (XSS) Attack; OWASP Top 10 2021, A7: Cross-site Scripting (XSS).

by Rose at Jul 27, 2024, 05:08 PM

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