ms-update and MS Internet Explorer root CA

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L0 Member

ms-update and MS Internet Explorer root CA

Hi,

In my company, we explicitely block the application ms-update to control workstations update policy.

But I realized that MS internet explorer tries to update its "root list sequence number" at each HTTPS connection.

The file that MS IE tries to access is at :

www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt

In your opinion, what would be the best approach to block ms-update except this Internet Explorer access ?

Thanks.


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L4 Transporter

Re: ms-update and MS Internet Explorer root CA

Hi

You can  create a custom application based on the url information.

and create a security rule that allow this application and place it above the rule which deny the windows update.

https://live.paloaltonetworks.com/docs/DOC-1966

View solution in original post


All Replies
Highlighted
L4 Transporter

Re: ms-update and MS Internet Explorer root CA

Hi

You can  create a custom application based on the url information.

and create a security rule that allow this application and place it above the rule which deny the windows update.

https://live.paloaltonetworks.com/docs/DOC-1966

View solution in original post

Highlighted
L0 Member

Re: ms-update and MS Internet Explorer root CA

Hi,

Thanks for the tip. It works as expected.

Highlighted
L4 Transporter

Re: ms-update and MS Internet Explorer root CA

Hello Mattieb,

Have seen similar issue and I want to share some screenshots in creating a custom app just to make it easy if some one faces the issue.

Steps:

1> Create custom app. 2> Apply in a security rule before the rule which blocks MS-Update APP rule. 3> Clear any existing matching sessions so the new sessions to hit the new app.

ms-crl-1.PNG.png

ms-crl-2.PNG.png

Wireshark info:

ms-crl-3.PNG.png

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