Getting UnAuthorizedAccessException in Windows 7 after installing KB3021952

Question

Recently Microsoft had released one security patch KB3021952 and installation of this KB on Windows 7 box is causing issues in our WPF hosted application. If same KB is installed on any other OS then we don’t face any issue. When we uninstall this KB from
Win 7 box then our application starts working fine.
In the application we have
CustomSecurityManagerEx2 implemented from WebBrowser.WebBrowserSite,
IServiceProviderEx2 and
IInternetSecurityManagerEx2 interfaces.
In this, when
IServiceProvider.QueryService
is called, it tries to create
ppvObject object by type casting
this object to
IInternetSecurityManagerEx2. Here
this is of type
CustomSecurityManagerEx2.
As part of this it tried to execute all methods of IInternetSecurityManagerEx2
interface but as soon as it goes to call the first method
GetSecurityIdEx2, there itself this.m_WebBrowser.Document
throws the exception of type “UnauthorizedAccesssException”.
Not sure what is causing this break with the latest KB on Win 7. Please give me some idea on this issue.

Answer 1

Hi,
According to the description in the KB below:
https://support.microsoft.com/en-us/kb/3021952?wa=wsignin1.0
Known issues with this security update:
Issue 1
After you install this security update, the Cisco AnyConnect Secure Mobility Client application may fail to establish virtual private network (VPN) connections in Windows 8.1 or Windows Server 2012 R2.
Fix for Issue 1
To resolve this issue, apply the following Fix it solution:
3023607 Secure Channel cumulative update changes TLS protocol renegotiation and fallback behavior
Issue 2
After you install this security update, applications may crash when they render table-based content in Internet Explorer 9 and Internet Explorer 8.
Status of Issue 2
Microsoft is working on a fix for this issue.
Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
This update really would cause some problem, in my opinion, you'd better uninstall this update temporarily to keep your application works normally.
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