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Microsoft Patch Tuesday, April 2017

April Patch Tuesday is here and, like the change of the seasons, this release comes with changes in how Microsoft presents these updates. Gone are the days of the Security Bulletins and instead Microsoft is taking a more CVE focused approach. Rather than reading bulletins, you can search for and research any CVE through the Microsoft Security Updates Guide. For more information about this change please read Microsoft's blog post, "Furthering Our Commitment to Security Updates".

Unlike the huge dump of 149 CVEs last month, which was really about three months worth of vulnerabilities, April greets us with a light 46 CVEs. This includes 15 CVEs rated "Critical" and 29 rated "Important" and two rated "Moderate". Across them all these vulnerabilities there are security updates for the following software:

  • Internet Explorer
  • Microsoft Edge
  • Microsoft Windows
  • Microsoft Office and Microsoft Office Services and Web Apps
  • Visual Studio for Mac
  • .NET Framework
  • Silverlight
  • Adobe Flash Player

Today's release includes a patch for the zero day reported last Friday affecting Microsoft Word. This vulnerability allowed attackers to create a malicious Word document that, when opened by the victim, could trigger arbitrary code execution. The list of "Critical" CVEs also includes remote code execution vulnerabilities for the .NET framework, Internet Explorer, Edge, Outlook and the Microsoft Scripting Engine.

The virtualization platform Hyper-V takes the spotlight among the products patched today. There are thirteen CVEs total for the platform with four of them patching critical Remote Code Execution vulnerabilities.

Finally, the big news this Patch Tuesday is not what is getting patched but what is not getting patched. Today marks the big goodbye to Windows Vista. Vista was never a popular Windows platform, in fact according to Net Market Share there are still more legacy Windows XP systems in use than there are Vista systems. Hopefully however, where these systems are being used there is a plan for an upgrade. In this day and age there are few things more dangerous on the Internet than running an abandoned, unpatched operating system.

Critical CVEs

.NET Remote Code Execution Vulnerability
Impact: Remote Code Execution

Hyper-V Remote Code Execution Vulnerability
CVE-2017-0162, CVE-2017-0163, CVE-2017-0180, CVE-2017-0181
Impact: Remote Code Execution

Internet Explorer Memory Corruption Vulnerability
Impact: Remote Code Execution

Microsoft Edge Memory Corruption Vulnerability
CVE-2017-0200, CVE-2017-0205
Impact: Remote Code Execution

Microsoft Outlook Remote Code Execution Vulnerability
CVE-2017-0106, CVE-2017-0199
Impact: Remote Code Execution

Scripting Engine Memory Corruption Vulnerability
CVE-2017-0093, CVE-2017-0158, CVE-2017-0201
Impact: Remote Code Execution

Defense-in-Depth Update for Microsoft Office
Impact: Remote Code Execution

April Flash Security Update
Impact: Remote Code Execution

Important CVEs

Active Directory Denial of Service Vulnerability
Impact: Denial of Service

ADFS Security Feature Bypass Vulnerability
Impact: Security Feature Bypass

ATMFD.dll Information Disclosure Vulnerability
Impact: Information Disclosure

Hyper-V Denial of Service Vulnerability
CVE-2017-0178, CVE-2017-0179, CVE-2017-0182, CVE-2017-0183, CVE-2017-0184, CVE-2017-0185, CVE-2017-0186
Impact: Denial of Service

Hyper-V Information Disclosure Vulnerability
CVE-2017-0168, CVE-2017-0169
Impact: Information Disclosure

Internet Explorer Elevation of Privilege Vulnerability
Impact: Elevation of Privilege

LDAP Elevation of Privilege Vulnerability
Impact: Elevation of Privilege

libjpeg Information Disclosure Vulnerability
Impact: Information Disclosure

Microsoft Office Memory Corruption Vulnerability
Impact: Information Disclosure

Microsoft Office Security Feature Bypass Vulnerability
Impact: Security Feature Bypass

Microsoft Office XSS Elevation of Privilege Vulnerability
Impact: Elevation of Privilege

Office DLL Loading Vulnerability
Impact: Remote Code Execution

Scripting Engine Information Disclosure Vulnerability
Impact: Information Disclosure

Win32k Elevation of Privilege Vulnerability
Impact: Elevation of Privilege

Win32k Information Disclosure Vulnerability
CVE-2017-0058, CVE-2017-0188
Impact: Information Disclosure

Windows Denial of Service Vulnerability
Impact: Denial of Service

Windows Elevation of Privilege Vulnerability
Impact: Elevation of Privilege

Windows Graphics Component Elevation of Privilege Vulnerability
Impact: Elevation of Privilege

Windows Graphics Elevation of Privilege Vulnerability
Impact: Elevation of Privilege

Windows Kernel Information Disclosure Vulnerability
Impact: Information Disclosure

Windows OLE Elevation of Privilege Vulnerability
Impact: Elevation of Privilege

Moderate CVEs

Microsoft Edge Security Feature Bypass Vulnerability
Impact: Security Feature Bypass

Microsoft Office Spoofing Vulnerability
Impact: Spoofing

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