Question 11

Input sanitization should be used to best mitigate this type of attack.

Implementing input sanitization is essential to prevent malicious code from being executed within user inputs, as evidenced by the use of a shell command in the User-Agent field in the logs.

A) Input sanitization

This option is correct because input sanitization involves validating and cleaning user input to prevent the execution of harmful commands or scripts. In the provided extract, the User-Agent contains a shell command, which indicates an attempt at code injection. By sanitizing input, such attacks can be effectively blocked.

B) Secure cookies

Secure cookies are designed to enhance the security of web sessions by preventing cookie theft or hijacking. While they are important for protecting user sessions, they do not address the core issue of preventing the execution of injected commands as seen in the User-Agent string.

C) Static code analysis

Static code analysis is a method used to examine source code for vulnerabilities before deployment. Although it helps identify potential security issues during development, it does not directly mitigate attacks stemming from user input at runtime, as shown in the logs.

D) Sandboxing

Sandboxing creates isolated environments to execute code safely, thus protecting the main system from malicious activities. However, it does not prevent the initial injection of malicious code through user inputs, which is the primary concern visible in the extract.

Conclusion

Input sanitization is the most effective measure to mitigate the attack illustrated in the logs, as it directly addresses the root cause of code injection. Other options like secure cookies, static code analysis, and sandboxing do not provide adequate protection against the exploitation of user input vulnerabilities. Therefore, only input sanitization offers a proactive solution to prevent such attacks.