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Category:   Application (Generic)  >   Microsoft .NET Vendors:   Microsoft
Microsoft .NET Lets Remote Users Bypass Certificate Use Restrictions on the Target System
SecurityTracker Alert ID:  1038458
SecurityTracker URL:
CVE Reference:   CVE-2017-0248   (Links to External Site)
Date:  May 10 2017
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.0 SP2, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7
Description:   A vulnerability was reported in Microsoft .NET. A remote user can bypass security controls on the target system.

The software does not properly validate certificates. A remote user can submit a specially crafted certificate that is marked as invalid for a specific use via Enhanced Key Usage taggings but will be allowed by the target system for that use.

Joonwoo Yu, Hyoung-Kee Choi of Sungkyunkwan University reported this vulnerability.

Impact:   A remote user can bypass certificate use controls on the target system.
Solution:   The vendor has issued a fix.

A restart is required.

The vendor advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Windows (2008), Windows (2012), Windows (7), Windows (8), Windows (10), Windows (Vista)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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