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2023 iThome 鐵人賽

DAY 9
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Modern Web

前端知識系列 第 16

CSRF Review Note

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讓我們來談談 CSRF

Original Answers

  1. CSRF: CSRF uses the browser's automatic cookie handling to make the victim unknowingly perform actions using their own token. XSS injects malicious code to execute unexpected behavior.
  2. Cookie Handling: Cookies are automatically included in every request.
  3. CSRF Protection: Settings like httponly, same-site, expiration time, domain, and referer can be configured in cookies, along with CSRF tokens.
  4. Double Submit Cookie Method: Add CSRF token in cookies and another CSRF token in the form.
  5. Real-world Scenario: The user's credentials could be exploited to perform sensitive actions like credit card transactions or CRUD operations on their data.

Feedback

  1. CSRF: Good understanding but needs more detail on how CSRF differs from XSS.
  2. Cookie Handling: Mentioned automatic inclusion but should elaborate on security settings.
  3. CSRF Protection: CSRF tokens are crucial but need more explanation.
  4. Double Submit Cookie Method: Needs further explanation.
  5. Real-world Scenario: Identified sensitive actions but should elaborate on additional security measures.

Corrected Answers

  1. CSRF: CSRF manipulates the browser's automatic cookie inclusion to make the victim perform unintended actions using their token. This is different from XSS, which injects malicious code into the browser.
  2. Cookie Handling: Security is enhanced by settings like "httponly," "same-site," "expiration time," and "domain," which restrict cookie access and transmission.
  3. CSRF Protection: CSRF tokens are unique and unpredictable, added to the form and stored in cookies, making it hard for attackers to forge requests.
  4. Double Submit Cookie Method: A CSRF token is stored in cookies and another is included in the form. Both tokens must match for the request to be valid.
  5. Real-world Scenario: CSRF can lead to unauthorized credit card transactions or CRUD operations on user data. Additional security measures are essential.

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