The Microsoft Locator service is a name service that maps logical names to network-specific names. It ships with Windows NT 4.0, Windows 2000, and Windows XP. By default, the Locator service is enabled only on Windows 2000 domain controllers and Windows NT 4.0 domain controllers; it is not enabled on Windows NT 4.0 workstations or member servers, Windows 2000 workstations or member servers, or Windows XP.
A security vulnerability results from an unchecked buffer in the Locator service. By sending a specially malformed request to the Locator service, an attacker could cause the Locator service to fail, or to run code of the attacker's choice on the system.
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