CVE-2022-26929: .NET Framework Remote Code Execution Vulnerability

Overview

Severity
High (CVSS 7.8)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Category
Remote Code Execution
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2022-Sep
Released
2022-09-13
Last Updated
2022-12-15
EPSS Score
4.91% (percentile: 89.6%)

FAQ

According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution? The word Remote in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. For example, when the score indicates that the Attack Vector is Local and User Interaction is Required, this could describe an exploit in which an attacker, through social engineering, convinces a victim to download and open a specially crafted file from a website which leads to a local attack on their computer. The Security Updates table indicates that this vulnerability affects all supported versions of .NET Framework installed on Windows. Why are Windows updates listed for Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows Server 2012, Windows 8.1, Windows Server 2012 R2, Windows 10, Windows 10 Version 1607, Windows Server 2016, Windows 10 Version 1809, and Windows Server 2019? The component affected by this vulnerability is serviced by Windows for Windows 10 version 1809 and earlier, and by .NET Framework for Windows 10 version 20H2 and later. To be protected from this vulnerability, customers should install the updates listed in the Security Updates table for their operating system as follows. Customers whose systems are configured to receive automatic updates do not need to take any further action. Customers running Windows 8.1 and earlier can install either the Windows Security Only or the Windows Monthly Update to receive the update for all versions of .NET Framework. Customers running Windows 10, Windows 10 version 1607, or Windows 10 version 1809 and later should install the Windows Security Update to receive the update for all versions of .NET Framework. Customers running Windows 10 version 20H2 and later should install the Security Update for the versions of .NET Framework installed on their system.

Affected Products (12)

Developer Tools

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 (Server Core installation)
  • Microsoft .NET Framework 4.8.1 on Windows 10 Version 21H1 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 21H2 for x64-based Systems
  • Microsoft .NET Framework 4.8.1 on Windows 10 Version 21H1 for x64-based Systems
  • Microsoft .NET Framework 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022
  • Microsoft .NET Framework 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems
  • Microsoft .NET Framework 4.8.1 on Windows 10 Version 21H1 for ARM64-based Systems
  • Microsoft .NET Framework 4.8.1 on Windows 10 Version 21H2 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 21H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.6/4.6.2 on Windows 10 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.6/4.6.2 on Windows 10 for x64-based Systems

Security Updates (6)

Acknowledgments

<a href="https://twitter.com/3r4nz">Eran Zimmerman Gonen</a> with <a href="https://www.accenture.com/us-en/services/security-index">Accenture Security Israel</a>

Revision History

  • 2022-09-13: Information published.
  • 2022-09-16: Updated the FAQs to further clarify the update guidance for this CVE. This is an informational change only.
  • 2022-12-15: In the Security Updates table, added .NET Framework 3.5 and 4.6/4.6.2 installed on Windows 10 for 32-bit Systems and Windows 10 for x64-based Systems as they are affected by this vulnerability. Microsoft strongly recommends that customers install the updates to be fully protected from the vulnerability. Customers whose systems are configured to receive automatic updates do not need to take any further action.