Disable 3DES for Admin HTTPS access

[b_sean_377285]

Hi,

I need to disable 3DES as a part of SWEET32 vulnerability. I have gone through few articles and they mention modifying the SSL client profile and commenting out 3DES. My question is -

1. What client profile is used for admin access?
2. Or do I need to modify httpd ssl-ciphersuite to have this fixed.

Thanks, Sean

[Lee_Sutcliffe]

Have you seen these articles?

https://support.f5.com/csp/article/K13405 https://support.f5.com/csp/article/K17491 https://support.f5.com/csp/article/K31320003

For the management console you need to modify the httpd cipher suite

list sys httpd ssl-ciphersuite

will show the current cipher suites for the management console

[youssef1]

Hi,

You don't use a client ssl for admin access. you have to use tmsh in order to disable ciphers on admin access.

First of if you want to check cipher used, enter this command:

list sys httpd ssl-ciphersuite

sys httpd {
    ssl-ciphersuite ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA:ECDHE-ECDSA-AES128-SHA256:ECDHE-ECDSA-AES256-SHA384:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA:AES256-SHA:AES128-SHA256:AES256-SHA256:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:DES-CBC3-SHA
    }

So if you want to disable 3DES you can just add

:!DES:!DES

at the end of the line.

So to modify SSL-Ciphersuite follow this procedure:

tmsh modify sys httpd ssl-ciphersuite 'ECDHE-RSA-AES128-GCM-SHA256:....:!DES:!DES'
tmsh save sys config
bigstart restart httpd

Keep me in touch.

regards

[lixiaodong]

hello, I try this but not solut problem​

[Nic_Foxton]

I've just had a scan report for this on my F5's.

So this will modify the cipher suite for admin only?

For vServers i need to maintain the multi-suite available due to some application owners not updating their apps for years and actually can't upgrade some. We're proxying between suites for some services (false security imho but i do what i'm told)

[Nic_Foxton]

All sorted thankyou for this info