Compromised VOIP Account

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Dulouz

883 posts

Ultimate Geek

#173284 18-May-2015 10:27

One of my 2talk phone lines was compromised yesterday with a few calls being made to some unusual countries. I've changed all the passwords on the account and devices although it was also suggested that I disallow SIP or web access to your device from the Internet.

I'm using Yealink devices and can't figure out how to do this - any most ideas welcome?

Amanon

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#1306995 18-May-2015 10:33

Can you see the IP address that it came from?

sbiddle

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#1307001 18-May-2015 10:35

Do you have any form of port forwarding enabled either on SIP ports or HTTP ports to your phone? You should under no circumstances have either that are public facing.

Dulouz

883 posts

Ultimate Geek

#1307006 18-May-2015 10:38

johnr: Can you see the IP address that it came from?

No - actually I wouldn't know where to look for that.

Amanon

Dulouz

883 posts

Ultimate Geek

#1307009 18-May-2015 10:40

sbiddle: Do you have any form of port forwarding enabled either on SIP ports or HTTP ports to your phone? You should under no circumstances have either that are public facing.

No port forwarding has been set up. The phones just have their default set up and are plugged into an ethernet cable and connect directly to 2talk.co.nz via port 5060

Amanon

sbiddle

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#1307020 18-May-2015 10:45

Dulouz:
sbiddle: Do you have any form of port forwarding enabled either on SIP ports or HTTP ports to your phone? You should under no circumstances have either that are public facing.

No port forwarding has been set up. The phones just have their default set up and are plugged into an ethernet cable and connect directly to 2talk.co.nz via port 5060

And you definitely didn't set up a port forward for port 5060 or any other port for SIP traffic?

Dulouz

883 posts

Ultimate Geek

#1307027 18-May-2015 10:50

sbiddle:
Dulouz:
sbiddle: Do you have any form of port forwarding enabled either on SIP ports or HTTP ports to your phone? You should under no circumstances have either that are public facing.

No port forwarding has been set up. The phones just have their default set up and are plugged into an ethernet cable and connect directly to 2talk.co.nz via port 5060

And you definitely didn't set up a port forward for port 5060 or any other port for SIP traffic?

No - I've only ever set up port forwarding in my life once before and that was for a NAS device.

Amanon

freitasm

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#1307087 18-May-2015 11:38

Possible this NAS device is compromised?

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Dulouz

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#1307201 18-May-2015 14:10

freitasm: Possible this NAS device is compromised?

Possibly - one thing I have noticed is if I enter my network IP address into the browser address bar it takes me to the Yealink device login page. This seems strange as it as has its own internal IP address. Why would it also be accessible via my network IP address?

Amanon

ajobbins

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#1307213 18-May-2015 14:15

Dulouz:
freitasm: Possible this NAS device is compromised?

Possibly - one thing I have noticed is if I enter my network IP address into the browser address bar it takes me to the Yealink device login page. This seems strange as it as has its own internal IP address. Why would it also be accessible via my network IP address?

That will be it.

Any chance the internal IP address you port forwarded to your NAS has now been reassigned to the Yealink? Another possible cause is that the Yealink is setting up it's own port forward using UPnP - but that seems less likely.

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Dulouz

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#1307233 18-May-2015 14:44

ajobbins:
Dulouz:
freitasm: Possible this NAS device is compromised?

Possibly - one thing I have noticed is if I enter my network IP address into the browser address bar it takes me to the Yealink device login page. This seems strange as it as has its own internal IP address. Why would it also be accessible via my network IP address?

That will be it.

Any chance the internal IP address you port forwarded to your NAS has now been reassigned to the Yealink? Another possible cause is that the Yealink is setting up it's own port forward using UPnP - but that seems less likely.

I had set up set up port forwarding for the MyCloud over a year ago as it was causing issues with my internet connection on mt TG589vn v2. For some reason the UPnP has applied it's self to the Yealink device. I notice that the device ip addresses seems to change so wonder if the game/service applies it's self to the ip address rather than the device. I've now removed the game/service from the Yealink device and when I enter the network IP I get the following message which I assume is normal.

Forbidden You don't have permission to access /cgi-bin/ConfigManApp.com on this server.

Amanon

ajobbins

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#1307235 18-May-2015 14:49

Port forwarding is usually set up to the IP not to a device MAC address, so if the IPs are changing (likley, unless you have set Static IPs for each device), I suspect your Yealink has assumed the IP you had port forwarded for your NAS.

Have your router set your NAS and VoIP devices static IPs based on their MAC address, then port forward to the static NAS IP (if you really have to). If you router doesn't let you set static IPs by device, you should be able to configure it at the device end (but make sure you set it to something outside your DHCP pool and on the same subnet).

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Dulouz

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#1307238 18-May-2015 14:53

ajobbins: Port forwarding is usually set up to the IP not to a device MAC address, so if the IPs are changing (likley, unless you have set Static IPs for each device), I suspect your Yealink has assumed the IP you had port forwarded for your NAS.

Have your router set your NAS and VoIP devices static IPs based on their MAC address, then port forward to the static NAS IP (if you really have to). If you router doesn't let you set static IPs by device, you should be able to configure it at the device end (but make sure you set it to something outside your DHCP pool and on the same subnet).

Thanks - I may no longer need the port forwarding as it seems it hasn't been working for a while anyway and I've had no internet issues. Thanks for your help.

Amanon

chevrolux

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#1307271 18-May-2015 15:36

Set a toll bar PIN on your 2Talk account too. You can have it set so that no international calls can be made without entering the PIN, but local, national, mobile etc do not require the PIN.

cyberhub

224 posts

Master Geek

#1307298 18-May-2015 16:33

2Talk voip account will be hack is annoying and potentially costly.

It appears that you don't have port forwarding or devices with a public IP. This suggests that your PC may have a keylogger or another device on your internal network may of been compromised.

First thing, I would run an online antivirus scan on your PC/Mac. I normally use Eset Nod 32 online scanner even if you have an antivirus program I would run this just to check. I would run this on all PC's on your network and remove any found viruses.

Once you have done that I would do the following

Change your 2Talk phone number password again (esp if it found some viruses)
Change or add a password onto your Yealink device (esp if it found some viruses)
Turn on 2Talk Authorisation Pin Code for Expensive Overseas Destinations
Also, you may want to turn off automatic credit card charging while you have this issue. As I have heard horror stories from people that come to work on Monday morning and have a $2,000 phone bill from a hacked voip line over the weekend.

If you do all that you should be pretty sorted.

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Dulouz

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Ultimate Geek

#1307311 18-May-2015 16:51

cyberhub: 2Talk voip account will be hack is annoying and potentially costly.

It appears that you don't have port forwarding or devices with a public IP. This suggests that your PC may have a keylogger or another device on your internal network may of been compromised.

First thing, I would run an online antivirus scan on your PC/Mac. I normally use Eset Nod 32 online scanner even if you have an antivirus program I would run this just to check. I would run this on all PC's on your network and remove any found viruses.

Once you have done that I would do the following

Change your 2Talk phone number password again (esp if it found some viruses)
Change or add a password onto your Yealink device (esp if it found some viruses)
Turn on 2Talk Authorisation Pin Code for Expensive Overseas Destinations
Also, you may want to turn off automatic credit card charging while you have this issue. As I have heard horror stories from people that come to work on Monday morning and have a $2,000 phone bill from a hacked voip line over the weekend.

If you do all that you should be pretty sorted.

Thanks for that - I've updated all passwords. My suspicion though is that is is a brute force attack and the port forwarding left the device open to be accessed.

Amanon

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