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Q: What are CAPTCHA-related exploitation points?

A: CAPTCHA systems can be exploited in several ways:

  1. Registration Function Bypass: Attackers can bypass CAPTCHA verification on registration forms to create accounts without proper validation.
  2. Accessing Restricted Functions: By defeating CAPTCHA, attackers can gain unauthorised access to functions that are meant to be restricted to specific users.
  3. Form Submission Abuse: Bypassing CAPTCHA allows attackers to automate form submissions, which can lead to server overload and other issues.
  4. Obtaining Prizes: Attackers can automate CAPTCHA solving to take advantage of promotional offers or prize draws.

CAPTCHA Defences:

  1. Precise Validation: Compare the user's input against the CAPTCHA value, paying attention to spaces and punctuation.
  2. Use Image CAPTCHAs: Image-based CAPTCHAs are harder for automated tools to solve.
  3. Dynamic Adjustments: Vary the CAPTCHA format to make it harder for attackers to build a reliable automated solver.
  4. Regular Updates: Frequently update the CAPTCHA system with more complex and longer challenges to stay ahead of attackers.