.NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability
Released: Jul 14, 2020
Last updated: Oct 13, 2020
- Assigning CNA
- Microsoft
- CVE.org link
- CVE-2020-1147
Executive Summary
A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and Visual Studio when the software fails to check the source markup of XML file input. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the process responsible for deserialization of the XML content.
To exploit this vulnerability, an attacker could upload a specially crafted document to a server utilizing an affected product to process content.
The security update addresses the vulnerability by correcting how .NET Framework, Microsoft SharePoint, and Visual Studio validates the source markup of XML content.
Exploitability
The following table provides an exploitability assessment for this vulnerability at the time of original publication.
- Publicly disclosed
- No
- Exploited
- No
- Exploitability assessment
- Exploitation More Likely
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.
Where does this vulnerability present itself?
The vulnerability is found in the DataSet
and DataTable
types which are .NET components used to manage data sets.
Where can I find additional developer guidance for the secure use of DataSet
or DataTable
types?
Updated security guidance can be found on MSDN here - https://go.microsoft.com/fwlink/?linkid=2132227
What updates need to be installed to fully protect my system from this vulnerability?
Full protection requires the installation of the .NET Framework update as well as updates for any additional affected products mentioned in this article.
Acknowledgements
Security Updates
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle.
Disclaimer
Revisions
To comprehensively address CVE-2020-1147, Microsoft has released the following: October Security Updates for all affected versions of .NET Framework installed on Windows 10; October 2020 Monthly Rollup updates AND updated versions of the Security Only updates released in July 2020 for all affected versions of .NET Framework installed on Windows 8.1, Windows Server 2012 R2, Windows Server 2012, Windows 7, Windows Server 2008 R2, and Windows Server 2008. Microsoft strongly recommends that customers install the updates to be fully protected from the vulnerability. Customers who install the Security Only updates should ensure that they re-install the updates after October 13. Customers whose systems are configured to receive automatic updates do not need to take any further action.
Information published.