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Microsoft Patch Tuesday, May 2017

Microsoft is releasing 56 CVEs for the May 2017 Patch Tuesday today. This includes 15 CVEs rated "Critical", 40 rated "Important" and one rated "Moderate". Across them all these vulnerabilities there are security updates for the following software and services:

  • Internet Explorer
  • Microsoft Edge Browser
  • Microsoft Windows
  • Microsoft Office and Microsoft Office Services and Web Apps
  • Microsoft Scripting Engine
  • Windows SMB
  • .NET Framework
  • Adobe Flash Player
  • Windows DNS Server
  • Microsoft SharePoint

As always you'll want to make sure that your Windows clients are set to auto-update which will take care of the patches for Internet Explorer, Office, Edge and Windows itself. Of particular concern is the wide array of patches issued to Windows SMB, the common protocol used in all Windows networks to share data and information. A full quarter of this month's release (13 CVEs) affect this protocol suite from Information Disclosure, Denial of Service and critical Remote Code Execution vulnerabilities. Remote Code Execution vulnerabilities also affect the Microsoft Scripting Engine that could be exploited just by visiting a malicious website.

On the server side of things, the Microsoft DNS server is getting a patch for a Denial of Service vulnerability. There's also a Cross Site Scripting vulnerability in Sharepoint and a Privilege Escalation vulnerability in the Hyper-V platform.

In a rare move Microsoft actually released an out of band patch the day before Patch Tuesday. On Saturday May 5th Google Project Zero researcher Tavis Ormandy announced on Twitter that he and colleague Natalie Silvanovich "discovered the worst Windows remote code exec in recent memory." He later added that the "Attack works against a default install, don't need to be on the same LAN and it's wormable"

Well we didn't need to wait until Patch Tuesday to get a patch for this one. The issue in question is a critical Remote Code Execution vulnerability in Microsoft Malware Protection Engine (aka Defender) ( The quick and agile patch was applauded even by Ormandy, who tweeted shortly after the patch was released "What an amazing response, thanks so much Simon and MSRC! That was incredible work." The patch should be automatically applied without any user interaction.


Critical CVEs

May Flash Security Update
Remote Code Execution

Microsoft Edge Memory Corruption Vulnerability
CVE-2017-0221, CVE-2017-0227, CVE-2017-0240, CVE-2017-0266
Remote Code Execution

Internet Explorer Memory Corruption Vulnerability
Remote Code Execution

Scripting Engine Memory Corruption Vulnerability
CVE-2017-0224, CVE-2017-0228, CVE-2017-0234, CVE-2017-0235, CVE-2017-0236, CVE-2017-0238
Remote Code Execution

Windows SMB Remote Code Execution Vulnerability
CVE-2017-0272, CVE-2017-0277, CVE-2017-0278, CVE-2017-0279
Remote Code Execution


Important CVEs

Internet Explorer Security Feature Bypass Vulnerability
Security Feature Bypass

Win32k Information Disclosure Vulnerability
Information Disclosure

Windows DNS Server Denial of Service Vulnerability
Denial of Service

Windows Hyper-V vSMB Elevation of Privilege Vulnerability
Elevation of Privilege

Windows COM Elevation of Privilege Vulnerability
CVE-2017-0213, CVE-2017-0214
Elevation of Privilege

Windows Kernel Information Disclosure Vulnerability
CVE-2017-0175, CVE-2017-0220
Information Disclosure

Microsoft Internet Explorer Memory Corruption Vulnerability
Remote Code Execution

Scripting Engine Memory Corruption Vulnerability
Remote Code Execution

Microsoft Browser Spoofing Vulnerability
Security Feature Bypass

Microsoft Edge Elevation of Privilege Vulnerability
CVE-2017-0233, CVE-2017-0241
Elevation of Privilege

Microsoft ActiveX Information Disclosure Vulnerability
Information Disclosure

Windows Kernel Elevation of Privilege Vulnerability
Elevation of Privilege

Win32k Information Disclosure Vulnerability
Information Disclosure

.Net Security Feature Bypass Vulnerability
Security Feature Bypass

Microsoft SharePoint XSS Vulnerability

Windows Kernel Information Disclosure Vulnerability
CVE-2017-0258, CVE-2017-0259
Information Disclosure

Microsoft Office Remote Code Execution Vulnerability
CVE-2017-0243, CVE-2017-0254, CVE-2017-0261, CVE-2017-0262, CVE-2017-0264, CVE-2017-0265, CVE-2017-0281
Remote Code Execution

Windows GDI Denial of Service Vulnerability
Denial of Service

Win32k Elevation of Privilege Vulnerability
CVE-2017-0246, CVE-2017-0263
Elevation of Privilege

Windows SMB Denial of Service
Denial of Service

Windows SMB Information Disclosure Vulnerability
CVE-2017-0267, CVE-2017-0268, CVE-2017-0270, CVE-2017-0271, CVE-2017-0274, CVE-2017-0275, CVE-2017-0276
Information Disclosure

Windows SMB Remote Code Execution Vulnerability
Denial of Service

Windows SMB Information Disclosure Vulnerability
Denial of Service


Moderate CVEs

Scripting Engine Memory Corruption Vulnerability
Security Feature Bypass

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