[asterisk-users] asterisk security....again

[Jamie A. Stapleton]

http://sipera.com/ is one such product.

From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rizwan Hisham
Sent: Monday, February 28, 2011 9:33 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] asterisk security....again

Thanks Mr. Kevin.

Can anyone please also tell me which firewall is best suited for asterisk/sip attack prevention. Is there any firewall built specially to address sip security problems?
On Mon, Feb 28, 2011 at 6:38 PM, Kevin P. Fleming <kpfleming at digium.com<mailto:kpfleming at digium.com>> wrote:
On 02/28/2011 07:27 AM, Rizwan Hisham wrote:
Any suggestions on encrypting the sip and rtp. I have done some googling
on it. looks like it is not supported by most end point devices or
service providers. But still your thoughts will be appreciated on this
subject.

You cannot protect a remote SIP endpoint from attacks via your server; that SIP endpoint is an endpoint itself, and if it can receive IP packets from attackers, it will process them. These packets don't go through your server, and encrypting the legitimate traffic between your server and the remote endpoint isn't going to make any difference at all.

The *only* way to address attacks like this is to modify the configuration of the remote endpoint to ignore all incoming packets that aren't from your server(s). Even that is not a perfect solution, though, because the attacker (if they are actually aware of your server and customers) can spoof the IP addresses of your server(s) in order to get the remote endpoints to at least accept an INVITE (they can't place a successful call through them using spoofing though).

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Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kfleming at digium.com<mailto:kfleming at digium.com>
Check us out at www.digium.com<http://www.digium.com> & www.asterisk.org<http://www.asterisk.org>


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Rizwan Qureshi
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