Solved

Enforce encryption strength on Cisco ASA VPN

Posted on 2014-01-21
3
2,508 Views
Last Modified: 2014-02-19
Hello

My client has an ASA 5505 firewall using the classic VPN client software. Cisco are dropping support for this client so we want to move to Anyconnect Essentials client software and we will upgrade the ASA to the latest versions of the OS (asa914-k8.bin) and ASDM (asdm-715-100.bin).
We would like to enforce a key length of 256 bits AES and 2048 RSA and the ASA should drop connection requests not meeting these standards. Is it possible to enforce this using the software mentioned?

My understanding of encryption is not the best.

Many thanks,

Alasdair Barclay
0
Comment
Question by:Alasdairb
  • 2
3 Comments
 
LVL 12

Accepted Solution

by:
Henk van Achterberg earned 500 total points
ID: 39798062
you can set SSL settings for SSL VPN/ASDM. This is not for AnyConnect though:

http://epubbud_uploads.s3.amazonaws.com/13749785/MZ39X7RW/03fig02.jpg

http://www.epubbud.com/read.php?g=MZ39X7RW&tocp=10

ciscoasa(config)#ssl trust-point TEST-CA outside
ciscoasa(config)# webvpn
ciscoasa(config-webvpn)#ssl server-version tlsv1
ciscoasa(config-webvpn)#ssl encryption aes128-sha1 aes256-sha1 3des-sha1 des-sha1
0
 

Author Comment

by:Alasdairb
ID: 39800497
Hello Henk,

thanks for the links, I did not come across these. I guess the line then would be
ciscoasa(config-webvpn)#ssl encryption aes256-sha1

and leave out the other options. It will either negotiate the aes256-sha1 or it won't connect.

I hope to have a proper read of your lined document tomorrow and will report back.

Thanks.
0
 

Author Closing Comment

by:Alasdairb
ID: 39871158
Hello Henk,

sorry I've been away so long, many projects to pay with. It's not sorted yet, at least the enforcement, but at least the Anyconnect is working.

I'll award the points as you were the only person to help, and you gave me good reading tips I didn't find myself.

Thanks.

Alasdair
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Monitor Internet Edge Router behind Firewall 2 22
virus encrypted files with OSIRIS extension 12 61
Data encryption when using public Wi-Fi 4 34
Cisco  3750E switches 1 28
In 2017, ransomware will become so virulent and widespread that if you aren’t a victim yourself, you will know someone who is.
This past year has been one of great growth and performance for OnPage. We have added many features and integrations to the product, making 2016 an awesome year. We see these steps forward as the basis for future growth.
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question