Patch Tuesday

Earlier today, Microsoft published the October 2017 Patch Tuesday, the company's monthly update train, addressing important security issues, but also some mundane bugfixes.

This month, the Patch Tuesday updates include fixes for 62 security bugs in applications such as the Windows OS, various Office offerings, Skype for Business, Internet Explorer, Microsoft Edge, and the Chackra Core browser engine.

Fix for Office Word zero-day included

Of all the bugs, the most important is a zero-day that was publicly disclosed and later used in attacks on live targets before Microsoft got around in releasing today's fixes.

The vulnerability (CVE-2017-11826) is a remote code execution (RCE) bug that affects Office Word, discovered by three Qihoo 360 security researchers.

Affected products include Microsoft Word 2007 and later releases, but also Word Automation Services and Microsoft Office Web Apps Server. Microsoft describes the issue as follows:

A remote code execution vulnerability exists in Microsoft Office software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) containing a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file.

Two other bugs were publicly disclosed, but not abused

While details about the Office Word zero-day led to its abuse, two other bugs that became public were not detected in live attacks.

The two are CVE-2017-8703 (a denial of service issue in the Windows Subsystem for Linux) and CVE-2017-11777 (a cross-site scripting vulnerability in Microsoft Office SharePoint).

Below is a table listing of all the 62 security issues fixed this month. We used PowerShell and the Microsoft API to assemble the table below, but the report is much longer. We hosted the full report on GitHub, here.

If you're not interested in all security updates and you'd like to filter updates per product, you can use Microsoft's official Security Update Guide, available here.

Adobe, which usually syncs security bulletins with Microsoft, did not release security fixes today.

Tag CVE ID CVE Title
Device Guard CVE-2017-8715 Windows Security Feature Bypass Vulnerability
Device Guard CVE-2017-11823 Microsoft Windows Security Feature Bypass
Internet Explorer CVE-2017-11790 Internet Explorer Information Disclosure Vulnerability
Internet Explorer CVE-2017-11810 Scripting Engine Memory Corruption Vulnerability
Internet Explorer CVE-2017-11822 Internet Explorer Memory Corruption Vulnerability
Internet Explorer CVE-2017-11813 Internet Explorer Memory Corruption Vulnerability
Microsoft Edge CVE-2017-8726 Microsoft Edge Memory Corruption Vulnerability
Microsoft Edge CVE-2017-11794 Microsoft Edge Information Disclosure Vulnerability
Microsoft Graphics Component CVE-2017-11816 Windows GDI Information Disclosure Vulnerability
Microsoft Graphics Component CVE-2017-11763 Microsoft Graphics Remote Code Execution Vulnerability
Microsoft Graphics Component CVE-2017-11762 Microsoft Graphics Remote Code Execution Vulnerability
Microsoft Graphics Component CVE-2017-11824 Windows Graphics Component Elevation of Privilege Vulnerability
Microsoft Graphics Component CVE-2017-8693 Microsoft Graphics Information Disclosure Vulnerability
Microsoft JET Database Engine CVE-2017-8718 Microsoft JET Database Engine Remote Code Execution Vulnerability
Microsoft JET Database Engine CVE-2017-8717 Microsoft JET Database Engine Remote Code Execution Vulnerability
Microsoft Office CVE-2017-11776 Microsoft Outlook Information Disclosure Vulnerability
Microsoft Office CVE-2017-11775 Microsoft Office SharePoint XSS Vulnerability
Microsoft Office CVE-2017-11774 Microsoft Outlook Security Feature Bypass Vulnerability
Microsoft Office CVE-2017-11777 Microsoft Office SharePoint XSS Vulnerability
Microsoft Office CVE-2017-11826 Microsoft Office Memory Corruption Vulnerability
Microsoft Office CVE-2017-11825 Microsoft Office Remote Code Execution Vulnerability
Microsoft Office ADV170017 Office Defense in Depth Update
Microsoft Office CVE-2017-11786 Skype for Business Elevation of Privilege Vulnerability
Microsoft Office CVE-2017-11820 Microsoft Office SharePoint XSS Vulnerability
Microsoft Scripting Engine CVE-2017-11798 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11799 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11809 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11796 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11797 Scripting Engine Information Disclosure Vulnerability
Microsoft Scripting Engine CVE-2017-11806 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11800 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11808 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11807 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11805 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11804 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11811 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11801 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11802 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11812 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11821 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11793 Scripting Engine Memory Corruption Vulnerability
Microsoft Scripting Engine CVE-2017-11792 Scripting Engine Memory Corruption Vulnerability
Microsoft Windows CVE-2017-11818 Windows Storage Security Feature Bypass Vulnerability
Microsoft Windows ADV170016 Windows Server 2008 Defense in Depth
Microsoft Windows CVE-2017-11783 Windows Elevation of Privilege Vulnerability
Microsoft Windows CVE-2017-11769 TRIE Remote Code Execution Vulnerability
Microsoft Windows DNS CVE-2017-11779 Windows DNSAPI Remote Code Execution Vulnerability
Microsoft Windows Search Component CVE-2017-11772 Microsoft Search Information Disclosure Vulnerability
Microsoft Windows Search Component CVE-2017-11771 Windows Search Remote Code Execution Vulnerability
Windows Kernel CVE-2017-11784 Windows Kernel Information Disclosure Vulnerability
Windows Kernel CVE-2017-11817 Windows Information Disclosure Vulnerability
Windows Kernel CVE-2017-11814 Windows Kernel Information Disclosure Vulnerability
Windows Kernel CVE-2017-11765 Windows Kernel Information Disclosure Vulnerability
Windows Kernel CVE-2017-11785 Windows Kernel Information Disclosure Vulnerability
Windows Kernel-Mode Drivers CVE-2017-8694 Win32k Elevation of Privilege Vulnerability
Windows Kernel-Mode Drivers CVE-2017-8689 Win32k Elevation of Privilege Vulnerability
Windows NTLM ADV170014 Optional Windows NTLM SSO authentication changes
Windows Shell CVE-2017-8727 Windows Shell Memory Corruption Vulnerability
Windows Shell CVE-2017-11819 Windows Shell Remote Code Execution Vulnerability
Windows SMB Server CVE-2017-11815 Windows SMB Information Disclosure Vulnerability
Windows SMB Server CVE-2017-11782 Windows SMB Elevation of Privilege Vulnerability
Windows SMB Server CVE-2017-11781 Windows SMB Denial of Service Vulnerability
Windows SMB Server CVE-2017-11780 Windows SMB Remote Code Execution Vulnerability
Windows Subsystem for Linux CVE-2017-8703 Windows Subsystem for Linux Denial of Service Vulnerability
Windows TPM ADV170012 Vulnerability in TPM could allow Security Feature Bypass
Windows Update CVE-2017-11829 Windows Update Delivery Optimization Elevation of Privilege Vulnerability