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Faizan Aalam

 • 

Bacancy • 12h

Ever thought about why "Username or password is invalid" appears when you enter wrong credentials, instead of a more meaningful message like "Username not found" or "Password did not match"? This is because of an attack called an Oracle Attack, Oracle attacks happen because the server returns validation responses in the form of yes/no or valid/invalid messages. In a login scenario, if we return separate errors like "Password is wrong" or "Email not found", an attacker can use these as an oracle to identify valid email addresses. Once they have a list of confirmed emails, the real attacks begin, Credential Stuffing, Brute Force, Phishing, Social Engineering. This doesn't stop at login. The forgot password flow is another common leak, showing "Email not found" instead of "A password reset link has been sent if you are registered on our platform" gives away the same information. fix: collapse your responses into one generic message.

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