block https websites

Hi Experts,
in our company I have a cisco asa firewall with the csc module.
I can block https sites, like facebook.
But I am not able to block https sites, and this is a lack of security.
How to block https sites, like facebook ?
Eprs_AdminSystem ArchitectAsked:
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Priya PerumpilavilSoftware EngineerCommented:
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Istvan KalmarHead of IT Security Division Commented:
HI,

Please refer this page:
http://www.petenetlive.com/KB/Article/0000054.htm

Best regards,
Istvan
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Ernie BeekExpertCommented:
The formentioned solutions only work with http, even when using regular expressions in the asa. https is not supported. As per Cisco:  HTTPS filtering is not supported on ASA. ASA cannot do deep packet inspection or inspection based on regular expression for HTTPS traffic, because in HTTPS, content of packet is encrypted (SSL).

What you can try is to just blackhole these sites in your internal corp DNS. Resolve them to 127.0.0.1
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Istvan KalmarHead of IT Security Division Commented:
HI,

If you deny the destination port of TCP/443 you able to block the all  https sites on inside leg of the ASA!

Best regards,
Istvan
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Pete LongTechnical ConsultantCommented:
Thanks ikalmar ;)

But if you have a csc module why not block it with that?

 
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Eprs_AdminSystem ArchitectAuthor Commented:
Hi PeteLong:
I have done this in the csc module.
I entered https://www.facebook.com to block.
And I entered the ip of facebook to block.

But nothing helped, when you goto facebook over https, it is working.
Maybe the module is not working correct.

Do you have another solution ?
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Eprs_AdminSystem ArchitectAuthor Commented:
I don't want to block all https ports.
I just want to block some websites with https.
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Istvan KalmarHead of IT Security Division Commented:
ok in this case you need two way:
1. regex on the config
2. use CSC

or buy a third party device which is hande the http and https traffic control, like websense!

Best regards,
Istvan
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Ernie BeekExpertCommented:
@ikalmar: you should know this, we had an issue like this before :)
Using regex (and CSC for that matter), you can only block http NOT https, like I posted earlier.
Sorry about that.
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Eprs_AdminSystem ArchitectAuthor Commented:
ok what kind of other possibilities I have ?
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Ernie BeekExpertCommented:
Well, the rude way is to just block port 443 but I think you don't want that.
So another option is to deploy a proxy like ISA, Forefront or have a look at something like Websense.
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Eprs_AdminSystem ArchitectAuthor Commented:
with my CSC module is it not possible ?
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Ernie BeekExpertCommented:
No, sorry:
HTTPS Traffic Issue

Problem

You are unable to block the HTTPS traffic through CSC-SSM. How can the HTTPS traffic be blocked?

Solution

The CSC-SSM cannot block the HTTPS traffic because it cannot deep inspect the packet due to the SSL encryption on it.


Source: http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a00808dea62.shtml#HTTPS
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