OSX update and Decryption

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
Announcements
Please sign in to see details of an important advisory in our Customer Advisories area.

OSX update and Decryption

L4 Transporter

I've installed our Root CA cert in the "System" keychain, and have it marked as trusted.  I can successfully decrypt web traffic from a MAC running Mojave.  No problems there. 

 

The problem comes in when I try updating the OSX or even check for updates from the CLI.   

 

When I run "softwareupdate -l"  in terminal, In the logs on the firewall it appears to be coming through as web browsing app, and getting decrypted.  

 

I ran a packet capture, and it shows the client is resetting the connection after succesffuly going out to swscan.apple.com, which is not whitelisted for decryption exclusions.  Has anyone run into issues when trying to decrypt on OSX with a trusted root cert, while trying to update the operating system itself?

 

Guessing adding these domains to decryption exclusion is going to fix this?

2 accepted solutions

Accepted Solutions

Cyber Elite
Cyber Elite

@Sec101,

Whitelist the following:

  • gg.apple.com
  • gnf-mdn.apple.com
  • gnf-mr.apple.com
  • gs.apple.com
  • ig.apple.com
  • mesu.apple.com
  • skl.apple.com
  • swcdn.apple.com
  • swdist.apple.com
  • swdownload.apple.com
  • swpost.apple.com
  • swscan.apple.com
  • updates-http.cdn-apple.com
  • updates.cdn-apple.com
  • xp.apple.com

That should take care of the software updates and allow your clients to actually update successfully. 

View solution in original post

Correct. Exclude those domains from decryption and your clients should be able to check for and download updates again. 

View solution in original post

8 REPLIES 8

Cyber Elite
Cyber Elite

@Sec101,

Whitelist the following:

  • gg.apple.com
  • gnf-mdn.apple.com
  • gnf-mr.apple.com
  • gs.apple.com
  • ig.apple.com
  • mesu.apple.com
  • skl.apple.com
  • swcdn.apple.com
  • swdist.apple.com
  • swdownload.apple.com
  • swpost.apple.com
  • swscan.apple.com
  • updates-http.cdn-apple.com
  • updates.cdn-apple.com
  • xp.apple.com

That should take care of the software updates and allow your clients to actually update successfully. 

Perfect!  As always, an excellent reply!  Thank you.  When you say whitelist- you mean exclude decryption right?

Correct. Exclude those domains from decryption and your clients should be able to check for and download updates again. 

Hi,BPry

 

>Whitelist the following:

>....

 
Is this list actual?
 
 
 
 You mean path "Device -> Cert mgmt -> SSL Decription Exclusion" and add  all listed domains one by one?
Or "Policies -> Decryption -> New rule" and add rule with custom URL category.

 

Andrew

@aaobuhov,

That is the actual list yes. You can exclude these domains in either method, personally I like doing it in the decryption rulebase via a custom No-Decrypt URL category. 

Thank you for reply 

I prefer "No-Decrypt URL category" too.

Can i summarize your list to:

*.apple.com

*.cdn-apple.com

 

It will be a less strict list.
Is such version possible?

 

Andrew

@aaobuhov,

You could. As you said, it would be less restrictive and potentially allow additional traffic that you otherwise could have decrypted and gained insight into. 

Thank you, I understand.

 

Best wishes,
Andrew

  • 2 accepted solutions
  • 6656 Views
  • 8 replies
  • 0 Likes
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!