.NET Security Feature Bypass Vulnerability
CVE-2017-0248
Security Vulnerability
Released: May 9, 2017
- Assigning CNA
- Microsoft
- CVE.org link
- CVE-2017-0248
Executive Summary
A security feature bypass vulnerability exists when Microsoft .NET Framework (and .NET Core) components do not completely validate certificates.
An attacker could present a certificate that is marked invalid for a specific use, but the component uses it for that purpose. This action disregards the Enhanced Key Usage taggings.
The security update addresses the vulnerability by helping to ensure that .NET Framework (and .NET Core) components completely validate certificates.
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 Unlikely
FAQ
How do I determine which version of Microsoft .NET Framework is installed on my system? You can install and run multiple versions of .NET Framework on a system, and you can install the versions in any order. For more information, see Microsoft Knowledge Base Article 318785.
How do I locate the updates for the versions of .NET Framework installed on my system? The download links in the Affected Products table are to the Parent KB number in the Microsoft Update Catalog. To locate the packages you need to download, in the Microsoft Update Catalog, click Download for the platform you have installed on your system. In the Download window, click to download each update that is applicable to your system.
Customers who have updates automatically installed will be offered the Parent KB; however, the package KB numbers listed for each platform will be displayed in Add Remove Programs.
The following table lists the Parent KB numbers for the Monthly Rollup Releases and the Security Only Releases, and the package KB numbers they contain. For more information about Microsoft's update servicing model for Microsoft .NET Framework, see this Microsoft .NET Blog Post.
| Monthly Rollup Release | Security Only Release | |||
|---|---|---|---|---|
| Platform | Parent KB | Child KBs | Parent KB | Child KBs |
| Windows Server 2008 | 4019115 | 4014502 - .NET Framework 2.0 | 4019109 | 4014575 - .NET Framework 2.0 |
| 4014514 - .NET Framework 4.5.2 | 4014599 - .NET Framework 4.5.2 | |||
| 4014511 - .NET Framework 4.6 | 4014591- .NET Framework 4.6 | |||
| Windows 7 | 4019112 | 4014504 - .NET Framework 3.5.1 | 4019108 | 4014579 - .NET Framework 3.5.1 |
| Windows Server 2008 R2 | 4014514 - .NET Framework 4.5.2 | 4014599 - .NET Framework 4.5.2 | ||
| 4014511 - .NET Framework 4.6/4.6.1 | 4014591 - .NET Framework 4.6/4.6.1 | |||
| 4014508 - .NET Framework 4.6.2 | 4014588 - .NET Framework 4.6.2 | |||
| Windows Server 2012 | 4019113 | 4014503 - .NET Framework 3.5 | 4019110 | 4014577 - .NET Framework 3.5 |
| 4014513 - .NET Framework 4.5.2 | 4014597 - .NET Framework 4.5.2 | |||
| 4014509 - .NET Framework 4.6/4.6.1 | 4014589 - .NET Framework 4.6/4.6.1 | |||
| 4014506 - .NET Framework 4.6.2 | 4014586 - .NET Framework 4.6.2 | |||
| Windows 8.1 | 4019114 | 4014505 - .NET Framework 3.5 | 4019111 | 4014581 - .NET Framework 3.5 |
| Windows Server 2012 R2 | 4014512 - .NET Framework 4.5.2 | 4014595 - .NET Framework 4.5.2 | ||
| 4014510 - .NET Framework 4.6/4.6.1 | 4014590 - .NET Framework 4.6/4.6.1 | |||
| 4014507 - .NET Framework 4.6.2 | 4014587 - .NET Framework 4.6.2 | |||
| Windows 10 Platforms | Parent KB | .NET Framework Product | ||
| Windows 10 | 4019474 | .NET Framework 3.5 | None | |
| .NET Framework 4.6 | ||||
| Windows 10 Version 1511 | 4019473 | .NET Framework 3.5 | None | |
| .NET Framework 4.6.1 | ||||
| Windows 10 Version 1607 | 4019472 | .NET Framework 3.5 | None | |
| .NET Framework 4.6.2 | ||||
| Windows Server 2016 | 4019472 | .NET Framework 3.5 | None | |
| .NET Framework 4.6.2 | ||||
| Windows 10 Version 1703 | 4019471 | .NET Framework 4.7 | None |
Acknowledgements
- Joonwoo Yu, Hyoung-Kee Choi of Sungkyunkwan University
Security Updates
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle.
Release date Descending
Product
Platform
Impact
Max Severity
Article
Download
Build Number
May 9, 2017
Microsoft .NET Framework 4.7
Windows 10 Version 1703 for x64-based Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 4.7
Windows 10 Version 1703 for 32-bit Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows RT 8.1
Security Feature Bypass
Important
- Monthly Rollup
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows 8.1 for x64-based systems
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows 8.1 for 32-bit systems
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows Server 2012 R2 (Server Core installation)
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows Server 2012 R2
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows Server 2012 (Server Core installation)
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows Server 2012
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows 7 for x64-based Systems Service Pack 1
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6/4.6.1
Windows 7 for 32-bit Systems Service Pack 1
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6.2
Windows RT 8.1
Security Feature Bypass
Important
- Monthly Rollup
- -
May 9, 2017
Microsoft .NET Framework 4.6.1
Windows 10 Version 1511 for x64-based Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 4.6.1
Windows 10 Version 1511 for 32-bit Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 4.6
Windows 10 for x64-based Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 4.6
Windows 10 for 32-bit Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 4.6
Windows Server 2008 for x64-based Systems Service Pack 2
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.6
Windows Server 2008 for 32-bit Systems Service Pack 2
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows Server 2012 R2 (Server Core installation)
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows Server 2012 R2
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows RT 8.1
Security Feature Bypass
Important
- Monthly Rollup
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows 8.1 for x64-based systems
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows 8.1 for 32-bit systems
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows Server 2012 (Server Core installation)
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows Server 2012
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows 7 for x64-based Systems Service Pack 1
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows 7 for 32-bit Systems Service Pack 1
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows Server 2008 for x64-based Systems Service Pack 2
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 4.5.2
Windows Server 2008 for 32-bit Systems Service Pack 2
Security Feature Bypass
Important
- -
- -
May 9, 2017
Microsoft .NET Framework 3.5
Windows Server 2016 (Server Core installation)
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 3.5
Windows Server 2016
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 3.5
Windows 10 Version 1703 for x64-based Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 3.5
Windows 10 Version 1703 for 32-bit Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 3.5
Windows 10 Version 1607 for x64-based Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 3.5
Windows 10 Version 1607 for 32-bit Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 3.5
Windows 10 Version 1511 for x64-based Systems
Security Feature Bypass
Important
- -
May 9, 2017
Microsoft .NET Framework 3.5
Windows 10 Version 1511 for 32-bit Systems
Security Feature Bypass
Important
- -
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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
version
revisionDate
description
1.0
May 9, 2017
Information published.
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