Windows 2000 Local Security Policy Corruption Vulnerability Patch eliminates a security vulnerability which could allow a malicious user to disrupt normal operation of an affected machine, and potentially of an entire network. This vulnerability could allow a malicious user to corrupt parts of a Windows 2000 systemls local security policy, with the effect of disrupting domain membership and trust relationship information. If a workstation or member server were attacked via this vulnerability, the machine would effectively be removed from the domain\; if a domain controller was attacked, it could no longer process domain logon requests. Recovering from such an attack would likely require that a known-working configuration be restored from backup. Users who have applied Windows 2000 Service Pack 1 are already protected against this vulnerability.