A security feature bypass vulnerability exists in Active Directory Federation Services (ADFS) which could allow an attacker to bypass the extranet lockout policy. To exploit this vulnerability, an attacker could run a specially crafted application, which would allow an attacker to launch a password brute-force attack or cause account lockouts in Active Directory. This security update corrects how ADFS handles external authentication requests.
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center