VoIP Mailing List Archives

[support at telium.ca]

The details of the source IP are available in the asterisk security log (if you have that enabled) – but that particular attack hides its address from the messages file.

It’s essential that you secure your PBX; there are options ranging from free to commercial.  Have a look at:

http://www.voip-info.org/wiki/view/Asterisk+security

It’s easy to get a $20,000 phone bill, so take securing your PBX seriously.

-M-


From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Motty
Sent: Wednesday, December 02, 2015 1:12 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion; motty.cruz@gmail.com
Subject: [asterisk-users] Failed to authenticate device 100



Hello, I continued to see this errors in the logs:

[2015-12-02 10:05:57] NOTICE[19949]: chan_sip.c:23277 handle_request_invite: Failed to authenticate device 100<sip:100@xx.xx.xx.xx> ([email]sip:100@xx.xx.xx.xx[/email]);tag=10cdeaf7

how do I guard against this kinds of attacks? Also, to get the IP address from where this attack come from I use the following command "tcpdump -lni eth0 -f "udp port 5060" is there an easy way to get the attacker's IP?

Thanks,
Motty

[motty.cruz at gmail.com]

Thanks M,
I have security enable,
; output security messages to the file named "Security"
security => security

I see the file created in /var/log/asterisk/security but is empty, and in /var/log/asterisk/messages I see the following:
[2015-12-03 06:52:32] NOTICE[19949] chan_sip.c: Failed to authenticate device 100<sip:100@X.X.X.X> ([email]sip:100@X.X.X.X[/email]);tag=a121ab55

X.X.X.X is the IP of my Server, I don't know who is the attacker IP unless I monitor for the server using the following command:
tcpdump -lni eth0 -f "udp port 5060"

Please advise.
Thanks,
Motty

On 12/02/2015 01:53 PM, Telium Technical Support wrote: