.NET Framework Elevation of Privilege Vulnerability

CVE-2019-1142
Security Vulnerability

Released: Sep 10, 2019

Assigning CNA
Microsoft
CVE.org link
CVE-2019-1142
Impact
Elevation of Privilege
Max Severity
Important

Executive Summary

An elevation of privilege vulnerability exists when the .NET Framework common language runtime (CLR) allows file creation in arbitrary locations. An attacker who successfully exploited this vulnerability could write files to folders that require higher privileges than what the attacker already has.

To exploit the vulnerability, an attacker would need to log into a system. The attacker could then specify the targeted folder and trigger an affected process to run.

The update addresses the vulnerability correcting how the .NET Framework CLR process logs data.

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 Less Likely

FAQ

There are two updates for .NET Framework 3.5 installed on Windows 10 version 1809 and Windows Server 2019. How do I know which update I need to install?

The security updates for Windows 10 version 1809 and Windows Server 2019 include both .NET Framework 3.5 and 4.7.2 or 4.8. Customers running these versions of Windows 10 need to determine if they are also running .NET Framework 4.7.2 or .NET Framework 4.8. Install the security update that includes that second version of .NET Framework.

Acknowledgements

  • Eran Shimony of CyberArk Labs
Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information.

Security Updates

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle.

Release date Descending
All results loaded
Loaded all 62 rows

Disclaimer

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Revisions

How satisfied are you with the MSRC Security Update Guide?