Why Changing Passwords Doesn’t End an Active Directory Breach

Key Points:

• Password resets in Active Directory (AD) and hybrid Entra ID environments do not immediately invalidate old credentials due to cached password hashes and synchronization delays, creating a window of vulnerability for attackers.
• Attackers exploit this gap using techniques like pass-the-hash, active Kerberos sessions, service account compromises, and forged Kerberos tickets (Golden and Silver Ticket attacks), allowing continued access despite password changes.
• Effective incident response requires more than password resets, including terminating active sessions, clearing Kerberos tickets, rotating service account passwords, and auditing group memberships, delegated rights, and privileged accounts to remove hidden access paths.
• The synchronization delay between AD and Entra ID is typically short but can be minimized further by enabling AD Change Notification or manual syncs, reducing the attack window.
• Solutions like Specops uReset help secure password resets by enforcing user verification and immediately updating cached credentials on devices, thereby reducing exposure to credential reuse and enhancing overall Active Directory security.