Original release date: November 14, 2014
Systems Affected
Microsoft Windows Server 2003 SP2Microsoft Windows Vista SP2Microsoft Windows Server 2008 SP2Microsoft Windows Server 2008 R2 SP1Microsoft Windows 7 SP1Microsoft Windows 8Microsoft Windows 8.1Microsoft Windows Server 2012Microsoft Windows Server 2012 R2Microsoft Windows RTMicrosoft Windows RT 8.1Microsoft Windows XP and 2000 may also be affected.
Overview
A critical vulnerability in Microsoft Windows systems could allow a remote attacker to execute arbitrary code via specially crafted network traffic.[1]
Description
Microsoft Secure Channel (Schannel) is a security package that provides SSL and TLS on Microsoft Windows platforms.[2, 3] Due to a flaw in Schannel, a remote attacker could execute arbitrary code on both client and server applications.[1]It may be possible for exploitation to occur without authentication and via unsolicited network traffic. According to Microsoft MS14-066, there are no known mitigations or workarounds.[2]Microsoft patches are typically reverse-engineered and exploits developed in a matter of days or weeks.[4] An anonymous Pastebin user has threatened to publish an exploit on Friday, November 14, 2014.[5]
Impact
This flaw allows a remote attacker to execute arbitrary code and fully compromise vulnerable systems.[6]
Solution
Microsoft has released Security Bulletin MS14-066 to address this vulnerability in supported operating systems.[2]
References

[1] NIST Vulnerability Summary for CVE-2014-6321
[2] Microsoft Security Bulletin MS14-066 – Critical
[3] Microsoft, Secure Channel
[4] Reddit, Microsoft Security Bulletin MS14-066
[5] Pastebin, SChannelShenanigans
[6] Winshock.txt

Revision History

November 14, 2014: Initial Release

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