Today is Microsoft's December 2021 Patch Tuesday, and with it comes fixes for six zero-day vulnerabilities and a total of 67 flaws. These updates include a fix for an actively exploited Windows Installer vulnerability used in malware distribution campaigns.
Microsoft has fixed 55 vulnerabilities (not including Microsoft Edge) with today's update, with seven classified as Critical and 60 as Important.
The number of each type of vulnerability is listed below:
- 21 Elevation of Privilege Vulnerabilities
- 26 Remote Code Execution Vulnerabilities
- 10 Information Disclosure Vulnerabilities
- 3 Denial of Service Vulnerabilities
- 7 Spoofing Vulnerabilities
For information about the non-security Windows updates, you can read about today's Windows 10 KB5008212 & KB5008206 updates released.
Six zero-days fixed, with two actively exploited
December's Patch Tuesday includes fixes for six zero-day vulnerabilities, with one actively exploited Windows AppX Installer vulnerability.
Microsoft classifies a vulnerability as a zero-day if it is publicly disclosed or actively exploited with no official fix available.
The actively exploited Windows AppX Installer zero-day vulnerability is tracked as CVE-2021-43890 and is used in various malware distribution campaigns, including Emotet, TrickBot, and BazarLoader.
Source: BleepingComputer
Microsoft also fixed five publicly disclosed zero-day vulnerabilities as part of the December 2021 Patch Tuesday that are not known to be exploited in attacks.
- CVE-2021-43240 - NTFS Set Short Name Elevation of Privilege Vulnerability
- CVE-2021-41333 - Windows Print Spooler Elevation of Privilege Vulnerability
- CVE-2021-43880 - Windows Mobile Device Management Elevation of Privilege Vulnerability
- CVE-2021-43883 - Windows Installer Elevation of Privilege Vulnerability
- CVE-2021-43893 - Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
Recent updates from other companies
Other vendors who released updates in November include:
- Android's December security updates were released last week.
- Apache Log4j: Numerous security advisories were released for the highly problematic vulnerability sweeping the Internet.
- Apple released security updates for iOS, iPadOS, macOS, tvOS and watchOS.
- Cisco released security updates for numerous products this month, including advisories related to the Log4j vulnerability in their products.
- SAP released its December 2021 security updates.
- VMWare released an advisory about current patches for the Log4j vulnerability in their products.
The December 2021 Patch Tuesday Security Updates
Below is the complete list of resolved vulnerabilities and released advisories in the December 2021 Patch Tuesday updates. To access the full description of each vulnerability and the systems that it affects, you can view the full report here.
| Tag | CVE ID | CVE Title | Severity |
|---|---|---|---|
| Apps | CVE-2021-43890 | Windows AppX Installer Spoofing Vulnerability | Important |
| ASP.NET Core & Visual Studio | CVE-2021-43877 | ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability | Important |
| Azure Bot Framework SDK | CVE-2021-43225 | Bot Framework SDK Remote Code Execution Vulnerability | Important |
| BizTalk ESB Toolkit | CVE-2021-43892 | Microsoft BizTalk ESB Toolkit Spoofing Vulnerability | Important |
| Internet Storage Name Service | CVE-2021-43215 | iSNS Server Memory Corruption Vulnerability Can Lead to Remote Code Execution | Critical |
| Microsoft Defender for IoT | CVE-2021-41365 | Microsoft Defender for IoT Remote Code Execution Vulnerability | Important |
| Microsoft Defender for IoT | CVE-2021-42311 | Microsoft Defender for IoT Remote Code Execution Vulnerability | Important |
| Microsoft Defender for IoT | CVE-2021-42310 | Microsoft Defender for IoT Remote Code Execution Vulnerability | Critical |
| Microsoft Defender for IoT | CVE-2021-43882 | Microsoft Defender for IoT Remote Code Execution Vulnerability | Important |
| Microsoft Defender for IoT | CVE-2021-43888 | Microsoft Defender for IoT Information Disclosure Vulnerability | Important |
| Microsoft Defender for IoT | CVE-2021-42314 | Microsoft Defender for IoT Remote Code Execution Vulnerability | Important |
| Microsoft Defender for IoT | CVE-2021-42313 | Microsoft Defender for IoT Remote Code Execution Vulnerability | Important |
| Microsoft Defender for IoT | CVE-2021-42312 | Microsoft Defender for IOT Elevation of Privilege Vulnerability | Important |
| Microsoft Defender for IoT | CVE-2021-43889 | Microsoft Defender for IoT Remote Code Execution Vulnerability | Important |
| Microsoft Defender for IoT | CVE-2021-42315 | Microsoft Defender for IoT Remote Code Execution Vulnerability | Important |
| Microsoft Devices | CVE-2021-43899 | Microsoft 4K Wireless Display Adapter Remote Code Execution Vulnerability | Critical |
| Microsoft Edge (Chromium-based) | CVE-2021-4056 | Chromium: CVE-2021-4056: Type Confusion in loader | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4055 | Chromium: CVE-2021-4055 Heap buffer overflow in extensions | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4054 | Chromium: CVE-2021-4054 Incorrect security UI in autofill | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4052 | Chromium: CVE-2021-4052 Use after free in web apps | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4053 | Chromium: CVE-2021-4053 Use after free in UI | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4065 | Chromium: CVE-2021-4065 Use after free in autofill | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4064 | Chromium: CVE-2021-4064 Use after free in screen capture | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4063 | Chromium: CVE-2021-4063 Use after free in developer tools | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4068 | Chromium: CVE-2021-4068 Insufficient validation of untrusted input in new tab page | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4067 | Chromium: CVE-2021-4067 Use after free in window manager | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4066 | Chromium: CVE-2021-4066 Integer underflow in ANGLE | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4059 | Chromium: CVE-2021-4059 Insufficient data validation in loader | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4062 | Chromium: CVE-2021-4062 Heap buffer overflow in BFCache | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4061 | Chromium: CVE-2021-4061 Type Confusion in V8 | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4058 | Chromium: CVE-2021-4058 Heap buffer overflow in ANGLE | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-4057 | Chromium: CVE-2021-4057 Use after free in file API | Unknown |
| Microsoft Local Security Authority Server (lsasrv) | CVE-2021-43216 | Microsoft Local Security Authority Server (lsasrv) Information Disclosure Vulnerability | Important |
| Microsoft Message Queuing | CVE-2021-43236 | Microsoft Message Queuing Information Disclosure Vulnerability | Important |
| Microsoft Message Queuing | CVE-2021-43222 | Microsoft Message Queuing Information Disclosure Vulnerability | Important |
| Microsoft Office | CVE-2021-43875 | Microsoft Office Graphics Remote Code Execution Vulnerability | Important |
| Microsoft Office | CVE-2021-42295 | Visual Basic for Applications Information Disclosure Vulnerability | Important |
| Microsoft Office | CVE-2021-43905 | Microsoft Office app Remote Code Execution Vulnerability | Critical |
| Microsoft Office Access | CVE-2021-42293 | Microsoft Jet Red Database Engine and Access Connectivity Engine Elevation of Privilege Vulnerability | Important |
| Microsoft Office Excel | CVE-2021-43256 | Microsoft Excel Remote Code Execution Vulnerability | Important |
| Microsoft Office SharePoint | CVE-2021-42309 | Microsoft SharePoint Server Remote Code Execution Vulnerability | Important |
| Microsoft Office SharePoint | CVE-2021-42320 | Microsoft SharePoint Server Spoofing Vulnerability | Important |
| Microsoft Office SharePoint | CVE-2021-43242 | Microsoft SharePoint Server Spoofing Vulnerability | Important |
| Microsoft Office SharePoint | CVE-2021-42294 | Microsoft SharePoint Server Remote Code Execution Vulnerability | Important |
| Microsoft PowerShell | CVE-2021-43896 | Microsoft PowerShell Spoofing Vulnerability | Important |
| Microsoft Windows Codecs Library | CVE-2021-41360 | HEVC Video Extensions Remote Code Execution Vulnerability | Important |
| Microsoft Windows Codecs Library | CVE-2021-43248 | Windows Digital Media Receiver Elevation of Privilege Vulnerability | Important |
| Microsoft Windows Codecs Library | CVE-2021-43214 | Web Media Extensions Remote Code Execution Vulnerability | Important |
| Microsoft Windows Codecs Library | CVE-2021-40452 | HEVC Video Extensions Remote Code Execution Vulnerability | Important |
| Microsoft Windows Codecs Library | CVE-2021-40453 | HEVC Video Extensions Remote Code Execution Vulnerability | Important |
| Microsoft Windows Codecs Library | CVE-2021-43243 | VP9 Video Extensions Information Disclosure Vulnerability | Important |
| Office Developer Platform | CVE-2021-43255 | Microsoft Office Trust Center Spoofing Vulnerability | Important |
| Remote Desktop Client | CVE-2021-43233 | Remote Desktop Client Remote Code Execution Vulnerability | Critical |
| Role: Windows Fax Service | CVE-2021-43234 | Windows Fax Service Remote Code Execution Vulnerability | Important |
| Role: Windows Hyper-V | CVE-2021-43246 | Windows Hyper-V Denial of Service Vulnerability | Important |
| Visual Studio Code | CVE-2021-43891 | Visual Studio Code Remote Code Execution Vulnerability | Important |
| Visual Studio Code | CVE-2021-43908 | Visual Studio Code Spoofing Vulnerability | Important |
| Visual Studio Code - WSL Extension | CVE-2021-43907 | Visual Studio Code WSL Extension Remote Code Execution Vulnerability | Critical |
| Windows Common Log File System Driver | CVE-2021-43226 | Windows Common Log File System Driver Elevation of Privilege Vulnerability | Important |
| Windows Common Log File System Driver | CVE-2021-43224 | Windows Common Log File System Driver Information Disclosure Vulnerability | Important |
| Windows Common Log File System Driver | CVE-2021-43207 | Windows Common Log File System Driver Elevation of Privilege Vulnerability | Important |
| Windows Digital TV Tuner | CVE-2021-43245 | Windows Digital TV Tuner Elevation of Privilege Vulnerability | Important |
| Windows DirectX | CVE-2021-43219 | DirectX Graphics Kernel File Denial of Service Vulnerability | Important |
| Windows Encrypting File System (EFS) | CVE-2021-43217 | Windows Encrypting File System (EFS) Remote Code Execution Vulnerability | Critical |
| Windows Encrypting File System (EFS) | CVE-2021-43893 | Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability | Important |
| Windows Event Tracing | CVE-2021-43232 | Windows Event Tracing Remote Code Execution Vulnerability | Important |
| Windows Installer | CVE-2021-43883 | Windows Installer Elevation of Privilege Vulnerability | Important |
| Windows Kernel | CVE-2021-43244 | Windows Kernel Information Disclosure Vulnerability | Important |
| Windows Media | CVE-2021-40441 | Windows Media Center Elevation of Privilege Vulnerability | Important |
| Windows Mobile Device Management | CVE-2021-43880 | Windows Mobile Device Management Elevation of Privilege Vulnerability | Important |
| Windows NTFS | CVE-2021-43240 | NTFS Set Short Name Elevation of Privilege Vulnerability | Important |
| Windows NTFS | CVE-2021-43231 | Windows NTFS Elevation of Privilege Vulnerability | Important |
| Windows NTFS | CVE-2021-43230 | Windows NTFS Elevation of Privilege Vulnerability | Important |
| Windows NTFS | CVE-2021-43229 | Windows NTFS Elevation of Privilege Vulnerability | Important |
| Windows Print Spooler Components | CVE-2021-41333 | Windows Print Spooler Elevation of Privilege Vulnerability | Important |
| Windows Remote Access Connection Manager | CVE-2021-43223 | Windows Remote Access Connection Manager Elevation of Privilege Vulnerability | Important |
| Windows Remote Access Connection Manager | CVE-2021-43238 | Windows Remote Access Elevation of Privilege Vulnerability | Important |
| Windows Storage | CVE-2021-43235 | Storage Spaces Controller Information Disclosure Vulnerability | Important |
| Windows Storage Spaces Controller | CVE-2021-43227 | Storage Spaces Controller Information Disclosure Vulnerability | Important |
| Windows SymCrypt | CVE-2021-43228 | SymCrypt Denial of Service Vulnerability | Important |
| Windows TCP/IP | CVE-2021-43247 | Windows TCP/IP Driver Elevation of Privilege Vulnerability | Important |
| Windows Update Stack | CVE-2021-43237 | Windows Setup Elevation of Privilege Vulnerability | Important |
| Windows Update Stack | CVE-2021-43239 | Windows Recovery Environment Agent Elevation of Privilege Vulnerability | Important |
Comments
doriel - 2 years ago
The most relic and leaky piece of SW in the history of humanity, isnt it.
NoneRain - 2 years ago
https://www.cvedetails.com/top-50-products.php
doriel - 2 years ago
Cool. Thank you for the link! Its 8th most leaky piece of SW in the world, Im sorry.
xiz - 2 years ago
Na you're right, still the most if you combine all the Windows OS's. Debian has been around for over a 2 decades.
NoneRain - 2 years ago
https://www.cvedetails.com/top-50-vendors.php