The Secure Channel (aka SChannel) security package in Microsoft Windows Vista SP1 and SP2 Windows Server 2008 Gold SP2 and R2 and Windows 7 when IIS 7.x is used does not properly process client certificates during SSL and TLS handshakes which allows remote attackers to cause a denial of service (LSASS outage and reboot) via a crafted packet aka \TLSv1 Denial of Service Vulnerability.\