An information disclosure vulnerability exists when the Windows its:// protocol handler unnecessarily sends traffic to a remote site in order to determine the zone of a provided URL. This could potentially result in the disclosure of sensitive information to a malicious site. To exploit the vulnerability an attacker would have to trick a user into browsing to a malicious website or to an SMB or UNC path destination. An attacker who successfully tricked a user into disclosing the user's NTLM hash could attempt a brute-force attack to disclose the corresponding hash password. The security update addresses the vulnerability by correcting how the Windows its:// protocol handler determines the zone of a request.
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center