[asterisk-users] Attack on Sip server.

andrew Colin andrew at vsave.co.za
Fri Jun 27 11:15:30 CDT 2014

Block the ip?

You should only enable sip for your specific clients in iptables.

Sent from Samsung Mobile

<div>-------- Original message --------</div><div>From: arun kumar <arunvsadnikov at gmail.com> </div><div>Date:27/06/2014  4:42 PM  (GMT+02:00) </div><div>To: Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users at lists.digium.com> </div><div>Subject: Re: [asterisk-users] Attack on Sip server. </div><div>

    Change the protocol from tcp to udp in iptables.


On 27 Jun 2014 20:07, "Anurag Rana" <anuragrana31189 at gmail.com> wrote:

Hi All.

Someone is attacking on my SIP server.
There are lot of requests coming in and I am not able to stop it because I am unable to detect the IP address. 
I used wireshark to capture the packets.

Although I am using very strong password for my SIP users but still is there any way to drop these packets and stop this attack.

I tried dropping packet after matching some string (most of the packets from attacker contains string 'VaxSIPUserAgent/3.1' ) but it failed. Packets are still flowing in. 

iptables -I INPUT 1 -p tcp --dport 5060 -m string --string "VaxSIPUserAgent" --algo bm -j DROP

​Its something like this

Registration from '"30" <sp:30 at my_public_ip:5060> failed for '192.168.xxx.xxx:6373' - Wrong Password​

​and there are approx 10 request per minute of this type.

Please suggest some way to stop this.​

Anurag Rana 
On the trampoline of life's experiences, Striving towards a saintly life in the midst of these materialistic turbulences.

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