Content of the ASA CX filtering, looking for suggestions

I wanted to get some feedback on how the rest of you the security people do web content filtering.

The CX did a great job with HTTP but when it comes to HTTPS there leaves a lot to desire. When the CX first went live, it was configured to decrypt all the HTTPS traffic and deny transactions to servers "to the aid of a certificate not approved" and "If the secure session handshaking fails" lit.

Immediately, I started to implement the policy of 'do not read' and it worked very well for most of the sites affected by issues of HTTPS decryption. Other sites required certificate HTTPS imported to the CX for it to work.

However, due to the constant "error: 140920E3:SSL routines: SSL3_GET_SERVER_HELLO:parse tlsext" I experimented with different work a rounds until I found these articles.

http://www.exploresecurity.com/the-small-print-for-OpenSSL-legacy_renego...

https://www.digicert.com/news/2011-06-03-SSL-renego.htm

ATC suggestion was to create a deny statement (with the help of a group of objects that defines the ENTIRE domain name) at the top of the ACL that send traffic to the ASA to the CX. It was the only way to keep the CX deny "using a certificate not approved" and "If the secure session handshaking fails" decryption settings turned on.

Now I feel I'm back to square one, as the number of exceptions have grown exponentially. This led me to believe that I need to return to the path of the content filtering is implemented. My goal is to apply a simple and scalable solution. As I see it, I can continue to add to the list of exemptions "ASA to CX", is not a scalable solution, because it requires all FQDN to be defined (e.g. bank.com, server1.bank.com, server2.bank.com, etc.). The alternative is to relax the decryption CX configurations which I think is the equivalent to remove the airbags in a car for weight reduction to make it faster.

Any input would be appreciated!

I came to the conclusion that SSL decryption is no longer possible, where a robust PKI was deployed in a company. Even in this case we would ideally use a dedicated appliance SSL decryption, so we can give the CX (or ASA with firepower service module) good old http for inspection.

The right software modules do not have the processing power to line decryption rate for everything, but the more modest rate of return.

In addition, the CX is now removed for modules of firepower, so you won't see any significant new addressing this gap on the CX.

Tags: Cisco Security

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