Microsoft December 2021 Patch Tuesday fixes an actively exploited zero-day

Microsoft December 2021 Patch Tuesday addresses 67 vulnerabilities, including an actively exploited Windows Installer vulnerability.

Microsoft December 2021 Patch Tuesday addressed 67 vulnerabilities in Microsoft Windows and Windows Components, ASP.NET Core and Visual Studio, Azure Bot Framework SDK, Internet Storage Name Service, Defender for IoT, Edge (Chromium-based), Microsoft Office and Office Components, SharePoint Server, PowerShell, Remote Desktop Client, Windows Hyper-V, Windows Mobile Device Management, Windows Remote Access Connection Manager, TCP/IP, and the Windows Update Stack.

Below is the vulnerabilities addressed by Microsoft:

  • 21 Elevation of Privilege Vulnerabilities
  • 26 Remote Code Execution Vulnerabilities
  • 10 Information Disclosure Vulnerabilities
  • 3 Denial of Service Vulnerabilities
  • 7 Spoofing Vulnerabilities

Seven of the issues addressed by Microsoft are rated as critical, while the remaining ones are rated as Important in severity. One of the vulnerabilities fixed by Microsoft, tracked as CVE-2021-43890, is under active exploitation.

“We have investigated reports of a spoofing vulnerability in AppX installer that affects Microsoft Windows. Microsoft is aware of attacks that attempt to exploit this vulnerability by using specially crafted packages that include the malware family known as Emotet/Trickbot/Bazaloader.” reads the advisory published by Microsoft.

An attacker could exploit the vulnerability by tricking the victims into opening a specially crafted attachment sent via phishing messages.

The other zero-day vulnerabilities addressed by the company as part of the December 2021 Patch Tuesday are:

  • 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

The full list of vulnerabilities addressed by Microsoft is available here:

CVE Title Severity CVSS Public Exploited Type
CVE-2021-43890 Windows AppX Installer Spoofing Vulnerability Important 7.1 Yes Yes Spoofing
CVE-2021-43240 NTFS Set Short Name Elevation of Privilege Vulnerability Important 7.8 Yes No EoP
CVE-2021-43893 Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability Important 7.5 Yes No EoP
CVE-2021-43883 Windows Installer Elevation of Privilege Vulnerability Important 7.1 Yes No EoP
CVE-2021-43880 Windows Mobile Device Management Elevation of Privilege Vulnerability Important 5.5 Yes No EoP
CVE-2021-41333 Windows Print Spooler Elevation of Privilege Vulnerability Important 7.8 Yes No EoP
CVE-2021-43215 iSNS Server Remote Code Execution Vulnerability Critical 9.8 No No RCE
CVE-2021-43899 Microsoft 4K Wireless Display Adapter Remote Code Execution Vulnerability Critical 9.8 No No RCE
CVE-2021-42310 Microsoft Defender for IoT Remote Code Execution Vulnerability Critical 8.1 No No RCE
CVE-2021-43905 Microsoft Office app Remote Code Execution Vulnerability Critical 9.6 No No RCE
CVE-2021-43233 Remote Desktop Client Remote Code Execution Vulnerability Critical 7 No No RCE
CVE-2021-43907 Visual Studio Code WSL Extension Remote Code Execution Vulnerability Critical 9.8 No No RCE
CVE-2021-43217 Windows Encrypting File System (EFS) Remote Code Execution Vulnerability Critical 8.1 No No RCE
CVE-2021-43877 ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43225 Bot Framework SDK Remote Code Execution Vulnerability Important 7.5 No No RCE
CVE-2021-43219 DirectX Graphics Kernel File Denial of Service Vulnerability Important 7.4 No No DoS
CVE-2021-40452 HEVC Video Extensions Remote Code Execution Vulnerability Important 7.8 No No RCE
CVE-2021-40453 HEVC Video Extensions Remote Code Execution Vulnerability Important 7.8 No No RCE
CVE-2021-41360 HEVC Video Extensions Remote Code Execution Vulnerability Important 7.8 No No RCE
CVE-2021-43892 Microsoft BizTalk ESB Toolkit Spoofing Vulnerability Important 7.1 No No Spoofing
CVE-2021-42312 Microsoft Defender for IOT Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43888 Microsoft Defender for IoT Information Disclosure Vulnerability Important 7.5 No No Info
CVE-2021-41365 Microsoft Defender for IoT Remote Code Execution Vulnerability Important 8.8 No No RCE
CVE-2021-42311 Microsoft Defender for IoT Remote Code Execution Vulnerability Important 8.8 No No RCE
CVE-2021-42313 Microsoft Defender for IoT Remote Code Execution Vulnerability Important 8.8 No No RCE
CVE-2021-42314 Microsoft Defender for IoT Remote Code Execution Vulnerability Important 8.8 No No RCE
CVE-2021-42315 Microsoft Defender for IoT Remote Code Execution Vulnerability Important 8.8 No No RCE
CVE-2021-43882 Microsoft Defender for IoT Remote Code Execution Vulnerability Important 9 No No RCE
CVE-2021-43889 Microsoft Defender for IoT Remote Code Execution Vulnerability Important 7.2 No No RCE
CVE-2021-43256 Microsoft Excel Remote Code Execution Vulnerability Important 7.8 No No RCE
CVE-2021-42293 Microsoft Jet Red Database Engine and Access Connectivity Engine Elevation of Privilege Vulnerability Important 6.5 No No EoP
CVE-2021-43216 Microsoft Local Security Authority Server (lsasrv) Information Disclosure Vulnerability Important 6.5 No No Info
CVE-2021-43222 Microsoft Message Queuing Information Disclosure Vulnerability Important 7.5 No No Info
CVE-2021-43236 Microsoft Message Queuing Information Disclosure Vulnerability Important 7.5 No No Info
CVE-2021-43875 Microsoft Office Graphics Remote Code Execution Vulnerability Important 7.8 No No RCE
CVE-2021-43255 Microsoft Office Trust Center Spoofing Vulnerability Important 5.5 No No Spoofing
CVE-2021-43896 Microsoft PowerShell Spoofing Vulnerability Important 5.5 No No Spoofing
CVE-2021-42294 Microsoft SharePoint Server Remote Code Execution Vulnerability Important 7.2 No No RCE
CVE-2021-42309 Microsoft SharePoint Server Remote Code Execution Vulnerability Important 8.8 No No RCE
CVE-2021-42320 Microsoft SharePoint Server Spoofing Vulnerability Important 8 No No Spoofing
CVE-2021-43242 Microsoft SharePoint Server Spoofing Vulnerability Important 7.6 No No Spoofing
CVE-2021-43227 Storage Spaces Controller Information Disclosure Vulnerability Important 5.5 No No Info
CVE-2021-43235 Storage Spaces Controller Information Disclosure Vulnerability Important 5.5 No No Info
CVE-2021-43228 SymCrypt Denial of Service Vulnerability Important 7.5 No No DoS
CVE-2021-42295 Visual Basic for Applications Information Disclosure Vulnerability Important 5.5 No No Info
CVE-2021-43891 Visual Studio Code Remote Code Execution Vulnerability Important 7.8 No No RCE
CVE-2021-43908 Visual Studio Code Spoofing Vulnerability Important N/A No No Spoofing
CVE-2021-43243 VP9 Video Extensions Information Disclosure Vulnerability Important 5.5 No No Info
CVE-2021-43214 Web Media Extensions Remote Code Execution Vulnerability Important 7.8 No No RCE
CVE-2021-43207 Windows Common Log File System Driver Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43226 Windows Common Log File System Driver Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43224 Windows Common Log File System Driver Information Disclosure Vulnerability Important 5.5 No No Info
CVE-2021-43248 Windows Digital Media Receiver Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43245 Windows Digital TV Tuner Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43232 Windows Event Tracing Remote Code Execution Vulnerability Important 7.8 No No RCE
CVE-2021-43234 Windows Fax Service Remote Code Execution Vulnerability Important 7.8 No No RCE
CVE-2021-43246 Windows Hyper-V Denial of Service Vulnerability Important 5.6 No No DoS
CVE-2021-43244 Windows Kernel Information Disclosure Vulnerability Important 6.5 No No Info
CVE-2021-40441 Windows Media Center Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43229 Windows NTFS Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43230 Windows NTFS Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43231 Windows NTFS Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43239 Windows Recovery Environment Agent Elevation of Privilege Vulnerability Important 7.1 No No EoP
CVE-2021-43223 Windows Remote Access Connection Manager Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43238 Windows Remote Access Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43237 Windows Setup Elevation of Privilege Vulnerability Important 7.8 No No EoP
CVE-2021-43247 Windows TCP/IP Driver Elevation of Privilege Vulnerability Important 7.8 No No EoP
* CVE-2021-4052 Chromium: CVE-2021-4052 Use after free in web apps High N/A No No RCE
* CVE-2021-4053 Chromium: CVE-2021-4053 Use after free in UI High N/A No No RCE
* CVE-2021-4054 Chromium: CVE-2021-4054 Incorrect security UI in autofill High N/A No No RCE
* CVE-2021-4055 Chromium: CVE-2021-4055 Heap buffer overflow in extensions High N/A No No RCE
* CVE-2021-4056 Chromium: CVE-2021-4056: Type Confusion in loader High N/A No No RCE
* CVE-2021-4057 Chromium: CVE-2021-4057 Use after free in file API High N/A No No RCE
* CVE-2021-4058 Chromium: CVE-2021-4058 Heap buffer overflow in ANGLE High N/A No No RCE
* CVE-2021-4059 Chromium: CVE-2021-4059 Insufficient data validation in loader High N/A No No RCE
* CVE-2021-4061 Chromium: CVE-2021-4061 Type Confusion in V8 High N/A No No RCE
* CVE-2021-4062 Chromium: CVE-2021-4062 Heap buffer overflow in BFCache High N/A No No RCE
* CVE-2021-4063 Chromium: CVE-2021-4063 Use after free in developer tools High N/A No No RCE
* CVE-2021-4064 Chromium: CVE-2021-4064 Use after free in screen capture High N/A No No RCE
* CVE-2021-4065 Chromium: CVE-2021-4065 Use after free in autofill High N/A No No RCE
* CVE-2021-4066 Chromium: CVE-2021-4066 Integer underflow in ANGLE High N/A No No RCE
* CVE-2021-4067 Chromium: CVE-2021-4067 Use after free in window manager High N/A No No RCE
* CVE-2021-4068 Chromium: CVE-2021-4068 Insufficient validation of untrusted input in new tab page Low N/A No No Spoofing

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Pierluigi Paganini

(SecurityAffairs – hacking, Microsoft December 2021 Patch Tuesday)

The post Microsoft December 2021 Patch Tuesday fixes an actively exploited zero-day appeared first on Security Affairs.

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