topic Re: WebVPN restrictions in Network Security

WebVPN restrictions

josephium — Mon, 11 Mar 2019 11:11:05 GMT

Hi,

i have a concern about webvpn.

after you enable webvpn on the outside interface of ASA, so now anyone can login to the page and try to login , doesn't this have the potential of a brute force attack, can't we restrict who can even see the webvpn page ?

Thank you

Re: WebVPN restrictions

whisperwind — Fri, 14 Sep 2007 13:01:25 GMT

Josephium,

That is a good quesiton about brute and I do not know the answer, if anyone does would love to learn it.

One of the things I have done is implement in ver 8 the virtual software keyboard. This appears when users try to enter their password. I would think this would hinder many brute attacks and it makes access more secure as there is no local caching inadvertently, its all mouse clicks.

You can certainly deny subnets to the outside interface of the ASA, I do suspect that would quickly become an admin nightmare.

Re: WebVPN restrictions

srue — Fri, 14 Sep 2007 16:16:40 GMT

I don't think you can deny access to the webvpn access using standard interface ACL's. But I don't know of any other way to restrict it either, unless there is a device in front of the ASA that can do some blocking.

Re: WebVPN restrictions

cnienhuis — Fri, 14 Sep 2007 21:16:14 GMT

You should use AAA authentication with a lockout after a certain number of failed attempts. For instance use a LDAP server to lookup user accounts against active directory. The accounts can be set to lockout after a number of invalid attempts. This won?t prevent access to the portal but will help to prevent un-authorized authentication. 8x code has very good support this.