Friday, November 14, 2014

Microsoft Secure Channel (Schannel) Vulnerability (CVE-2014-6321)



11/14/2014 10:32 AM EST






Original release date: November 14, 2014

Systems Affected
Microsoft Windows Server 2003 SP2
Microsoft Windows Vista SP2
Microsoft Windows Server 2008 SP2
Microsoft Windows Server 2008 R2 SP1
Microsoft Windows 7 SP1
Microsoft Windows 8
Microsoft Windows 8.1
Microsoft Windows Server 2012
Microsoft Windows Server 2012 R2
Microsoft Windows RT
Microsoft Windows RT 8.1

Microsoft 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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