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Certified Ethical Hacker (CEH) Practice Question

While mapping a target web application, you notice the login endpoint consistently returns the generic message "Invalid credentials". However, Burp Suite repeater shows an average 300 ms extra processing time whenever the supplied username actually exists in the database. Which approach should you automate to most effectively enumerate valid accounts without triggering account lockout policies?

  • Perform credential stuffing with leaked email/password pairs against the endpoint

  • Inject NULL bytes into the username field to bypass the password verification code

  • Launch a password-spraying campaign using one common password for every user

  • Measure server response delays to conduct a timing-based username enumeration attack

Certified Ethical Hacker (CEH)
Web Application Hacking
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