GIAC Foundational Cybersecurity Technologies Practice Test

What is the best way to defend against a Directory Traversal attack?

1. Regularly update software

2. Limit user input during system calls

3. Utilize complex passwords

4. Enable multifactor authentication

The correct answer is: Limit user input during system calls

Defending against a Directory Traversal attack primarily involves limiting user input during system calls. A Directory Traversal attack enables an attacker to access files and directories that are stored outside the intended directory. This typically occurs when an application takes user inputs, such as file path requests, and does not properly validate or sanitize those inputs. By limiting the type and format of user input—like implementing strict validation checks and ensuring that only legitimate, expected input is processed—systems can prevent unauthorized access to sensitive files. Regularly updating software is essential for overall security hygiene, but it does not specifically address the vulnerability related to Directory Traversal attacks. While complex passwords and multifactor authentication are vital components of access control and protection against unauthorized access, they do not directly mitigate the specific risks posed by Directory Traversal. Thus, focusing on user input is the most effective strategy for preventing such attacks.