CVE-2020-1476: ASP.NET and .NET Elevation of Privilege Vulnerability

Overview

Severity
N/A
Category
Elevation of Privilege
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2020-Aug
Released
2020-08-11
EPSS Score
0.98% (percentile: 76.8%)

Description

An elevation of privilege vulnerability exists when ASP.NET or .NET web applications running on IIS improperly allow access to cached files. An attacker who successfully exploited this vulnerability could gain access to restricted files. To exploit this vulnerability, an attacker would need to send a specially crafted request to an affected server. The update addresses the vulnerability by changing how ASP.NET and .NET handle requests.

FAQ

I am running Windows Server 2008, Windows 7, or Windows Server 2008 R2 and I cannot install the Monthly Rollup or Security Only updates for any of the 4.X versions of Microsoft .NET Framework. How do I protect my system from this vulnerability? There is a known issue with the Monthly Rollup and Security Only updates for the 4.X versions of .NET Framework installed on Windows Server 2008, Windows 7, and Windows Server 2008 R2. For a workaround to this known issue, please see the Article listed in the Security Updates table for the version of .NET Framework you are trying to install.

Affected Products (89)

Developer Tools

  • Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems
  • Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2
  • Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 (Server Core installation)
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows RT 8.1
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation)
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for x64-based Systems Service Pack 1
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for x64-based systems
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for 32-bit Systems Service Pack 1
  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems
  • Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems
  • Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1
  • Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
  • Microsoft .NET Framework 4.8 on Windows Server 2016
  • Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)
  • Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1
  • Microsoft .NET Framework 4.8 on Windows Server 2012 R2
  • Microsoft .NET Framework 4.8 on Windows Server 2012
  • Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)
  • Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)
  • Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
  • Microsoft .NET Framework 4.8 on Windows RT 8.1
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 2004 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 on Windows 10 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems
  • ... and 39 more

Security Updates (37)

Acknowledgments

<a href="http://vnprogramming.com">Pham Van Khanh</a> (<a href="https://twitter.com/rskvp93">@rskvp93</a>) from Viettel Cyber Security

Revision History

  • 2020-08-11: Information published.