Threat Level: green Handler on Duty: Johannes Ullrich

SANS ISC: Microsoft December Patch Tuesday - SANS Internet Storm Center SANS ISC InfoSec Forums

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Microsoft December Patch Tuesday

Overview of the December 2013 Microsoft patches and their status.

# Affected Contra Indications - KB Known Exploits Microsoft rating(**) ISC rating(*)
clients servers
MS13-096 Code Execution Vulnerability in GDI+
(ReplacesMS13-054 )
GDI+ TIFF Codec (Vista, Windows 2008, Office 2003, Office 2007, Office 2010, Lync 2010, Lync 2013
KB 2908005 Yes. Severity:Critical
Exploitability: 1
PATCH NOW! Critical
MS13-097 Cumulative Security Update for Internet Explorer
(ReplacesMS13-088 )
Windows Signature Validation
KB 2898785 No. Severity:Critical
Exploitability: 1,1,1,1,1,2,1
Critical Important
MS13-098 Remote Code Execution Vulnerabilitiy in Windows
Windows Signature Validation
KB 2893294 Yes (targeted attacks). Severity:Critical
Exploitability: 1
PATCH NOW! Critical
MS13-099 Remote Execution Vulnerability in Microsoft Scripting Runtime Object Library
Windows Script 5.6, 5.7, 5.8
KB 2909158 No. Severity:Critical
Exploitability: 1
Critical Important
MS13-100 Remote Code Execution in Microsoft SharePoint Server
(ReplacesMS13-067 MS13-084 )
SharePoint Server
KB 2904244 No. Severity:Important
Exploitability: 1
N/A Critical
MS13-101 Privilege Elevation Vulnerabilities in Kernel Mode Drivers
(ReplacesMS11-081 )
Kernel Mode Drivers
KB 2880430 No. Severity:Important
Exploitability: 2,1,3,2,3
Important Important
MS13-102 Privilege Elevation Vulnerability in LPC Client/Server
(ReplacesMS13-062 )
LPC Client/Server XP/2003 ONLY
KB 2998715 No. Severity:Important
Exploitability: 1
Important Important
MS13-103 Elevation of Privilege Vulnerability in ASP.NET
ASP.NET SingalR Forever Frame Transport Protocol
KB 2905238 No. Severity:Important
Exploitability: 1
N/A Important
MS13-104 Information Disclosure Vulnerability in Microsoft Office
(Replaces )
Office 2013
KB 2909976 No. Severity:Important
Exploitability: 3
Important Less Important
MS13-105 Remote Code Execution in Microsoft Exchange Server
(ReplacesMS13-061 )
WebReady Document Viewing and Data Loss Prevention on Exchange Server
KB 2915705 No. Severity:Critical
Exploitability: 3
N/A Critical
MS13-106 ASLR Bypass Vulnerability in Microsoft Office Shared Component
Microsoft Office 2007 and 2010
KB 2905238 Yes (targeted attacks). Severity:Important
Exploitability: ?
Important Important
We will update issues on this page for about a week or so as they evolve.
We appreciate updates
US based customers can call Microsoft for free patch related support on 1-866-PCSAFETY
(*): ISC rating
  • We use 4 levels:
    • PATCH NOW: Typically used where we see immediate danger of exploitation. Typical environments will want to deploy these patches ASAP. Workarounds are typically not accepted by users or are not possible. This rating is often used when typical deployments make it vulnerable and exploits are being used or easy to obtain or make.
    • Critical: Anything that needs little to become "interesting" for the dark side. Best approach is to test and deploy ASAP. Workarounds can give more time to test.
    • Important: Things where more testing and other measures can help.
    • Less Urgent: Typically we expect the impact if left unpatched to be not that big a deal in the short term. Do not forget them however.
  • The difference between the client and server rating is based on how you use the affected machine. We take into account the typical client and server deployment in the usage of the machine and the common measures people typically have in place already. Measures we presume are simple best practices for servers such as not using outlook, MSIE, word etc. to do traditional office or leisure work.
  • The rating is not a risk analysis as such. It is a rating of importance of the vulnerability and the perceived or even predicted threat for affected systems. The rating does not account for the number of affected systems there are. It is for an affected system in a typical worst-case role.
  • Only the organization itself is in a position to do a full risk analysis involving the presence (or lack of) affected systems, the actually implemented measures, the impact on their operation and the value of the assets involved.
  • All patches released by a vendor are important enough to have a close look if you use the affected systems. There is little incentive for vendors to publicize patches that do not have some form of risk to them.

(**): The exploitability rating we show is the worst of them all due to the too large number of ratings Microsoft assigns to some of the patches.

Johannes B. Ullrich, Ph.D.
SANS Technology Institute

Tags: mspatchday

2693 Posts
ISC Handler
• V1.1 (December 10, 2013): Clarified that users should -undo- the Disable the TIFF Codec workaround* and the Disable data collaboration in Lync workaround after applying the update. See the Update FAQ for more information. Added undo steps to the Disable data collaboration in Lync workaround...
Disable this Fix it - 51005

34 Posts Posts
December 2013 Office Update Release
9 Dec 2013 - "... There are 12 security updates (4 bulletins) and 43 non-security updates..."
(More detail at the URL above.)

Microsoft Security Bulletin MS13-106 - Important
Vulnerability in a Microsoft Office Shared Component Could Allow Security Feature Bypass
"... as exploited in the wild in December 2013, aka "HXDS ASLR Vulnerability."

34 Posts Posts

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