[asterisk-users] Detecting DoS attacks via SIP

[Kseniya Blashchuk]

Well, correct me if I'm wrong, but I would say this conversation you have
posted is a bit outdated, now fail2ban can be used with asterisk security
log
https://wiki.asterisk.org/wiki/display/AST/Asterisk+Security+Event+Logger.

On Thu, Aug 17, 2017, 4:53 AM Telium Technical Support <support at telium.ca>
wrote:

> Keep in mind that the attacks you are seeing in the log are ONLY the ones
> that Asterisk is detecting and rejecting.  All other attacks aren't even
> showing up!
>
> There's a good discussion of how to secure your PBX here:
> https://www.voip-info.org/wiki/view/asterisk+security
>
> In general, don't let the malevolent traffic get as far as the PBX (block
> at
> the firewall).  Also, Digium regularly warns users that fail2ban is NOT a
> security system: http://forums.asterisk.org/viewtopic.php?p=159984
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of mdiehl
> Sent: Tuesday, August 15, 2017 3:38 PM
> To: asterisk-users at lists.digium.com
> Subject: [asterisk-users] Detecting DoS attacks via SIP
>
> Hi all,
>
> Lately, I've seen an increase in the number of attacks against my system
> from the so-called "Friendly Scanner."  When one of these script kiddies
> targets my server, all I see for symptoms is a few of my trunks become
> lagged due to server load and a stream of messages on the console that
> resemble this:
>
> [Aug  2 20:27:50]   == Using SIP VIDEO CoS mark 6
> [Aug  2 20:27:50]   == Using SIP RTP TOS bits 24
> [Aug  2 20:27:50]   == Using SIP RTP CoS mark 5
> [Aug  2 20:32:47]   == Using SIP VIDEO TOS bits 24
> [Aug  2 20:32:47]   == Using SIP VIDEO CoS mark 6
> [Aug  2 20:32:47]   == Using SIP RTP TOS bits 24
> [Aug  2 20:32:47]   == Using SIP RTP CoS mark 5
> [Aug  2 20:34:26]   == Using SIP VIDEO TOS bits 24
> [Aug  2 20:34:26]   == Using SIP VIDEO CoS mark 6
>
>
> I have to turn on sip debugging to find out who's hitting me.  However, I
> can't just leave it on because it would kill my logging system.
>
> So, how are other people handling this?  Is there an AMI event I want watch
> for?  I watch for PeerStatus, but since there's no actual peer in the
> attack, I don't seem to get an event from AMI.
>
> Any ideas?
>
> Mike Diehl.
>
> --
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>
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>
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Check out the new Asterisk community forum at:
> https://community.asterisk.org/
>
> New to Asterisk? Start here:
>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>
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