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Authentication 4

This attack is often the result of one or more of the following:

User names (IDs, account names) may be guessable, published elsewhere, or are simply email addresses Authentication and related mechanisms may indicate whether a username is valid or not (registration, password reset/recovery, username recovery, change password, change email address) Missing authentication failure detection Missing monitoring to identify attacks against multiple user accounts, utilizing the same password Additionally another web or non-web application (e.g. mobile app, telephone service) that utilises the same credentials has one or more of the above problems.

NB: This card relates to user names. See AT 7 for the similar password cracking (brute forcing, dictionary attacks, guessing, credential stuffing, credential cracking).

How to play?

Sebastien can easily identify user names or can enumerate them


Owasp ASVS (4.0): 2.2.1 ,4.1.5

Capec: 383

Owasp SCP: 33,53

Owasp Appsensor: AE1

Safecode: 28

ASVS (4.0) Cheatsheetseries Index

ASVS V2.2 - General Authenticator Requirements

ASVS V4.1 - General Access Control Design


Password Guessing/Brute Force Attacks

Social engineering attack

Session Hijacking (Man-in-the-Middle)

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