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Overview

ASREPRoast is an attack that exploits accounts without the Kerberos pre-authentication required attribute.This vulnerability allows an attacker to request authentication data for a user from the Domain Controller (DC) without knowing the user’s password.The DC responds with a message encrypted using a key derived from the user password.The attacker can then attempt to crack this response offline to recover the user’s password.

Main Requirements

1. Lack of Kerberos Pre-Authentication
   Target accounts must have the “Do not require Kerberos pre-authentication” flag set.

2. Connection to the Domain Controller (DC)
   The attacker needs access to the DC to send authentication requests and receive encrypted responses.

3. Optional Domain Account
   Having a valid domain account allows the attacker to efficiently identify vulnerable users through LDAP queries.
   Without such an account, the attacker must rely on guessing or enumerating usernames.