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Luca Bertoncello

2015-Jun-08 19:46 UTC

[asterisk-users] Am I cracked?

Hi list!

Very strange...
I ran the Asterisk CLI for other tasks, and suddenly I got this message:

  == Using SIP RTP CoS mark 5
    -- Executing [000972592603325 at default:1]
Verbose("SIP/192.168.20.120-0000002a", "2,PROXY Call from 0123456
to 000972592603325") in new stack
  == PROXY Call from 0123456 to 000972592603325
    -- Executing [000972592603325 at default:2]
Set("SIP/192.168.20.120-0000002a",
"CHANNEL(musicclass)=default") in new stack
    -- Executing [000972592603325 at default:3]
GotoIf("SIP/192.168.20.120-0000002a", "0?dialluca") in new
stack
    -- Executing [000972592603325 at default:4]
GotoIf("SIP/192.168.20.120-0000002a", "0?dialfax") in new
stack
    -- Executing [000972592603325 at default:5]
GotoIf("SIP/192.168.20.120-0000002a", "0?dialanika") in new
stack
    -- Executing [000972592603325 at default:6]
Dial("SIP/192.168.20.120-0000002a",
"SIP/pbxluca/000972592603325,,R") in new stack
[Jun  8 21:42:50] WARNING[18981]: app_dial.c:2345 dial_exec_full: Unable to
create channel of type 'SIP' (cause 20 - Subscriber absent)
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing [000972592603325 at default:7]
Hangup("SIP/192.168.20.120-0000002a", "") in new stack
  == Spawn extension (default, 000972592603325, 7) exited non-zero on
'SIP/192.168.20.120-0000002a'
[Jun  8 21:43:22] WARNING[16633]: chan_sip.c:3830 retrans_pkt: Retransmission
timeout reached on transmission 8dc31ca4e660a0408450715638784d86 for seqno 1
(Critical Response) -- See
https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 32001ms with no response

At the time no phone try to call...
On my Firewall I see a SIP packet coming from an IP in Palestine...
Am I cracked? I think I disabled all "guest" access. How can I check
if my
Asterisk allows guest to originate calls?

Thanks
Luca Bertoncello
(lucabert at lucabert.de)

Kevin Larsen

2015-Jun-08 19:58 UTC

head link

[asterisk-users] Am I cracked?

> Very strange...
> I ran the Asterisk CLI for other tasks, and suddenly I got this message:
> 
>   == Using SIP RTP CoS mark 5
>     -- Executing [000972592603325 at default:1] Verbose("SIP/192.168.
> 20.120-0000002a", "2,PROXY Call from 0123456 to
000972592603325") innew
stack>   == PROXY Call from 0123456 to 000972592603325
>     -- Executing [000972592603325 at default:2] Set("SIP/192.168.20.
> 120-0000002a", "CHANNEL(musicclass)=default") in new stack
>     -- Executing [000972592603325 at default:3]
GotoIf("SIP/192.168.20.
> 120-0000002a", "0?dialluca") in new stack
>     -- Executing [000972592603325 at default:4]
GotoIf("SIP/192.168.20.
> 120-0000002a", "0?dialfax") in new stack
>     -- Executing [000972592603325 at default:5]
GotoIf("SIP/192.168.20.
> 120-0000002a", "0?dialanika") in new stack
>     -- Executing [000972592603325 at default:6] Dial("SIP/192.168.20.
> 120-0000002a", "SIP/pbxluca/000972592603325,,R") in new
stack
> [Jun  8 21:42:50] WARNING[18981]: app_dial.c:2345 dial_exec_full: 
> Unable to create channel of type 'SIP' (cause 20 - Subscriber
absent)
>   == Everyone is busy/congested at this time (1:0/0/1)
>     -- Executing [000972592603325 at default:7]
Hangup("SIP/192.168.20.
> 120-0000002a", "") in new stack
>   == Spawn extension (default, 000972592603325, 7) exited non-zero 
> on 'SIP/192.168.20.120-0000002a'
> [Jun  8 21:43:22] WARNING[16633]: chan_sip.c:3830 retrans_pkt: 
> Retransmission timeout reached on transmission 
> 8dc31ca4e660a0408450715638784d86 for seqno 1 (Critical Response) -- See 
> https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
> Packet timed out after 32001ms with no response
> 
> At the time no phone try to call...
> On my Firewall I see a SIP packet coming from an IP in Palestine...
> Am I cracked? I think I disabled all "guest" access. How can I
check if
my> Asterisk allows guest to originate calls?
Based on SIP packets coming in from IP addresses you don't recognize, 
while you may not be hacked, you would seem to have people probing your 
system. One thing you can do at the firewall level is restrict inbound sip 
communications to only those from your external phone providers. Depending 
on their setup, they should be able to give you an IP, a range of IPs or a 
name that can be used (i.e. sip.myphoneprovider.com). If you restrict your 
inbound sip to that, it will be very helpful. Also, there are further 
steps you can take to harden your systems. An internet search will bring 
up many, but here are a couple of good ones:

http://blogs.digium.com/2009/03/28/sip-security/
http://www.ipcomms.net/blog/70-11-steps-to-secure-your-asterisk-ip-pbx
http://nerdvittles.com/?p=580
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Luca Bertoncello

2015-Jun-08 20:09 UTC

head link

[asterisk-users] Am I cracked?

Kevin Larsen <kevin.larsen at pioneerballoon.com> schrieb:
> Based on SIP packets coming in from IP addresses you don't recognize, 
> while you may not be hacked, you would seem to have people probing your 
I think, too, it's someone probing my IP...
> system. One thing you can do at the firewall level is restrict inbound sip 
> communications to only those from your external phone providers. Depending 
> on their setup, they should be able to give you an IP, a range of IPs or a 
> name that can be used (i.e. sip.myphoneprovider.com). If you restrict your 
This is not really possible, since I'll login on my Asterisk from many
Providers...
> inbound sip to that, it will be very helpful. Also, there are further 
> steps you can take to harden your systems. An internet search will bring 
> up many, but here are a couple of good ones:
> 
> http://blogs.digium.com/2009/03/28/sip-security/
> http://www.ipcomms.net/blog/70-11-steps-to-secure-your-asterisk-ip-pbx
> http://nerdvittles.com/?p=580
OK, I set alwaysauthreject = yes and I discovered a allowguest, which I set
to "no", too.
The PBX is behind a Firewall and I just allow UDP 5060 and 10000-10100.
Now I log the SIP-pakets coming from Internet, too...

Hopefully I solved my problem...

Thanks
Luca Bertoncello
(lucabert at lucabert.de)

Michelle Dupuis

2015-Jun-08 20:55 UTC

head link

[asterisk-users] Am I cracked?

I'm guessing this is a small/home system?  I suggest you install SecAst from
this site: www.telium.ca   It's free for small office / home office and will
deal with these types of attacks and more.  It can also block users based on
their Geographic location (based on the phone number it attempted to dial I
suspect this is middle east), look for suspicious dialing patterns, etc.

If you still have allow guest enabled, then you should also follow the
'securing asterisk' steps from this site:
http://www.voip-info.org/wiki/view/Asterisk+security

You're definitely under attack (based on the 0123456 ID) so be sure to take
preventative steps to avoid a $50k phone bill..

________________________________________
From: asterisk-users-bounces at lists.digium.com <asterisk-users-bounces at
lists.digium.com> on behalf of Luca Bertoncello <lucabert at
lucabert.de>
Sent: Monday, June 8, 2015 3:46 PM
To: Asterisk Users List
Subject: [asterisk-users] Am I cracked?

Hi list!

Very strange...
I ran the Asterisk CLI for other tasks, and suddenly I got this message:

  == Using SIP RTP CoS mark 5
    -- Executing [000972592603325 at default:1]
Verbose("SIP/192.168.20.120-0000002a", "2,PROXY Call from 0123456
to 000972592603325") in new stack
  == PROXY Call from 0123456 to 000972592603325
    -- Executing [000972592603325 at default:2]
Set("SIP/192.168.20.120-0000002a",
"CHANNEL(musicclass)=default") in new stack
    -- Executing [000972592603325 at default:3]
GotoIf("SIP/192.168.20.120-0000002a", "0?dialluca") in new
stack
    -- Executing [000972592603325 at default:4]
GotoIf("SIP/192.168.20.120-0000002a", "0?dialfax") in new
stack
    -- Executing [000972592603325 at default:5]
GotoIf("SIP/192.168.20.120-0000002a", "0?dialanika") in new
stack
    -- Executing [000972592603325 at default:6]
Dial("SIP/192.168.20.120-0000002a",
"SIP/pbxluca/000972592603325,,R") in new stack
[Jun  8 21:42:50] WARNING[18981]: app_dial.c:2345 dial_exec_full: Unable to
create channel of type 'SIP' (cause 20 - Subscriber absent)
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing [000972592603325 at default:7]
Hangup("SIP/192.168.20.120-0000002a", "") in new stack
  == Spawn extension (default, 000972592603325, 7) exited non-zero on
'SIP/192.168.20.120-0000002a'
[Jun  8 21:43:22] WARNING[16633]: chan_sip.c:3830 retrans_pkt: Retransmission
timeout reached on transmission 8dc31ca4e660a0408450715638784d86 for seqno 1
(Critical Response) -- See
https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 32001ms with no response

At the time no phone try to call...
On my Firewall I see a SIP packet coming from an IP in Palestine...
Am I cracked? I think I disabled all "guest" access. How can I check
if my
Asterisk allows guest to originate calls?

Thanks
Luca Bertoncello
(lucabert at lucabert.de)

--
_____________________________________________________________________
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
               http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Steve Edwards

2015-Jun-08 22:46 UTC

head link

[asterisk-users] Am I cracked?

On Mon, 8 Jun 2015, Michelle Dupuis wrote:
> You're definitely under attack (based on the 0123456 ID) so be sure to 
> take preventative steps to avoid a $50k phone bill..
Don't enable 'auto-replenish' in your provider account and don't
keep a
balance you can't afford to lose.

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000

Dereck D

2015-Jun-10 14:09 UTC

head link

[asterisk-users] Am I cracked?

For such cases i created a dialplan in the default dialplan which blocks
the ip of the hacker with iptables.

On Monday, June 8, 2015, Luca Bertoncello <lucabert at lucabert.de> wrote:
> Hi list!
>
> Very strange...
> I ran the Asterisk CLI for other tasks, and suddenly I got this message:
>
>   == Using SIP RTP CoS mark 5
>     -- Executing [000972592603325 at default:1]
> Verbose("SIP/192.168.20.120-0000002a", "2,PROXY Call from
0123456 to
> 000972592603325") in new stack
>   == PROXY Call from 0123456 to 000972592603325
>     -- Executing [000972592603325 at default:2]
> Set("SIP/192.168.20.120-0000002a",
"CHANNEL(musicclass)=default") in new
> stack
>     -- Executing [000972592603325 at default:3]
> GotoIf("SIP/192.168.20.120-0000002a", "0?dialluca") in
new stack
>     -- Executing [000972592603325 at default:4]
> GotoIf("SIP/192.168.20.120-0000002a", "0?dialfax") in
new stack
>     -- Executing [000972592603325 at default:5]
> GotoIf("SIP/192.168.20.120-0000002a", "0?dialanika") in
new stack
>     -- Executing [000972592603325 at default:6]
> Dial("SIP/192.168.20.120-0000002a",
"SIP/pbxluca/000972592603325,,R") in
> new stack
> [Jun  8 21:42:50] WARNING[18981]: app_dial.c:2345 dial_exec_full: Unable
> to create channel of type 'SIP' (cause 20 - Subscriber absent)
>   == Everyone is busy/congested at this time (1:0/0/1)
>     -- Executing [000972592603325 at default:7]
> Hangup("SIP/192.168.20.120-0000002a", "") in new stack
>   == Spawn extension (default, 000972592603325, 7) exited non-zero on
> 'SIP/192.168.20.120-0000002a'
> [Jun  8 21:43:22] WARNING[16633]: chan_sip.c:3830 retrans_pkt:
> Retransmission timeout reached on transmission
> 8dc31ca4e660a0408450715638784d86 for seqno 1 (Critical Response) -- See
> https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
> Packet timed out after 32001ms with no response
>
> At the time no phone try to call...
> On my Firewall I see a SIP packet coming from an IP in Palestine...
> Am I cracked? I think I disabled all "guest" access. How can I
check if my
> Asterisk allows guest to originate calls?
>
> Thanks
> Luca Bertoncello
> (lucabert at lucabert.de <javascript:;>)
>
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
> New to Asterisk? Join us for a live introductory webinar every Thurs:
>                http://www.asterisk.org/hello
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
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Luca Bertoncello

2015-Jun-10 14:12 UTC

head link

[asterisk-users] Am I cracked?

Zitat von Dereck D <dereck.s at gmail.com>:
> For such cases i created a dialplan in the default dialplan which blocks
> the ip of the hacker with iptables.
That's interesting...
Could you explain me how do you did it?

Thanks
Luca Bertoncello
(lucabert at lucabert.de)

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