Block the Blue Coat Intermediate CA from Windows

Posted by erwin on Friday, May 27, 2016

TOC

Symantec has gotten in hot water for issuing rogue certificates (source). While Symantec has agreed to certificate transparency, Blue Coat systems is a known operator of MITM services they sell to enterprises, nation-states and governments, and this certificate would allow Blue Coat to issue arbitrary MITM certificates.

OSX instruction can be find over here (By Filippo Valsorda)

Block the Intermediate CA on your windows computer

  1. Download the certificate to your computer or just click “Open”. (for Firefox users read below)

Blue Coat Intermediate CA

  1. Click “Open” Blue Coat Intermediate CA

  2. click on “Install Certificate” Blue Coat Intermediate CA

  3. Install Certificate on “Local Machine” so it’s for all users using the computer. Blue Coat Intermediate CA

  4. Click “Yes” to Allow the changes Blue Coat Intermediate CA

  5. First we select “Place all certificates in the following store” then Click on “Browse” Blue Coat Intermediate CA

  6. Navigate to the “Untrusted Certificates” Folder en klik “OK” Blue Coat Intermediate CA

  7. Click “Next” for Importing Blue Coat Intermediate CA

  8. Click “Finish” and you’ve succesfully Blocked the BlueCoat Certificate! Blue Coat Intermediate CA

First Steps for Firefox Users

Firefox automaticly pops up a screen for importing certificates: Click on “View” bluefirefox1

Go to tab “Details” and Click “Export”. bluefirefox2

Save the file to a location and open it from there. bluefirefox3

Go back to step 2 for proceeding to block the certificate.


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