Content Security Policy (CSP)
Content Security Policy (CSP) is a security feature that helps prevent cross-site scripting (XSS) and other code injection attacks. It allows web developers to define a whitelist of trusted sources for content, such as scripts, images, and styles. When implemented correctly, CSP can effectively block unauthorized execution of inline scripts and external resources, reducing the risk of XSS attacks and other injection-based vulnerabilities. Implementing a strong CSP in web applications involves defining strict policies, ensuring proper server configuration, and continuously monitoring for violations.
Guide to Content Security Policy (CSP)
What is Content Security Policy (CSP)?
Content Security Policy (CSP) is a security standard introduced to prevent Cross-Site Scripting (XSS) and other code injection attacks resulting from execution of malicious content in the trusted web page context. It's a layer of security that helps to detect and suppress specific types of attacks, including XSS and data injection attacks.
Why is CSP Important?
CSP is significant because it works by defining the trusted sources of content for a web page reducing the risk associated with the injection of anything malicious. This provides a level of protection against the loading or execution of unauthorized or malicious scripts.
How does CSP work?
A web page administrator can add Content-Security-Policy HTTP header to a web page. This header is used to define the trusted sources of content that a web page can load. When the policy is violated, the browser will not load the untrusted content and the violation can be reported.
Exam Tips: Answering Questions on Content Security Policy (CSP)
Understand what CSP is: Be sure to know the definition of CSP and its role in securing a webpage. Know the importance of CSP: Explain why CSP is an essential feature in web security, relating it to the prevention of XSS attacks. Explain how CSP works: Be capable of describing how CSP functions. It will also be helpful to find real-life examples of CSP in action to fully understand its implementation. Practice: Answer practice questions on CSP to ensure you understand and can apply the concept effectively.
CompTIA Security+ - Web Security Example Questions
Test your knowledge of Amazon Simple Storage Service (S3)
Question 1
A website manager wants to allow loading images from only their domain and a trusted CDN. Which CSP policy achieves this?
Question 2
A company wants to implement subresource integrity for their external script. Which CSP directive can be used in combination with the script element 'integrity' attribute?
Question 3
A web application developer wants to prevent cross-site scripting (XSS) attacks. Which CSP directive should be used to restrict the sources of script files?
Go Premium
CompTIA Security+ Preparation Package (2024)
- 1087 Superior-grade CompTIA Security+ practice questions.
- Accelerated Mastery: Deep dive into critical topics to fast-track your mastery.
- Unlock Effortless CompTIA Security+ preparation: 5 full exams.
- 100% Satisfaction Guaranteed: Full refund with no questions if unsatisfied.
- Bonus: If you upgrade now you get upgraded access to all courses
- Risk-Free Decision: Start with a 7-day free trial - get premium features at no cost!