[VoiceOps] SS7

[Matthew Yaklin]

Here is a paper that may shed some light on the discussion for the curious.


https://www.sans.org/reading-room/whitepapers/critical/fall-ss7--critical-security-controls-help-36225

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________________________________
From: Kidd Filby <kiddfilby at gmail.com>
Sent: Thursday, April 21, 2016 2:01 PM
To: Chris Aloi
Cc: Matthew Yaklin; voiceops at voiceops.org
Subject: Re: [VoiceOps] SS7

In a strictly TDM world, or conversation... having access to the SS7 network gets you nothing but what and where the call traversed.  NO audio is carried and without End Office controlling software for call routing, just dropping it into some IP connection is not going to afford you anything other than what you already have.  You still need access to the audio carrying infrastructure of the network to get the audio.

I cannot comment on CALEA

Kidd

On Thu, Apr 21, 2016 at 10:56 AM, Chris Aloi <ctaloi at gmail.com<mailto:ctaloi at gmail.com>> wrote:
It looked like they had access to SS7 links (likely A links terminated to a physical server) and were using FreeSWITCH to somehow fork the media from the call and record it.  Just a guess based on  the quick console recording.

Correct, SS7 doesn't carry the actual voice it handles the signaling to bring up the voice channels (by identifying be point code and CICs) and various other signaling bits.  Not sure if there are provisions for CALEA in SS7 that could fork a media stream or exactly how that would work.

So I guess the barrier to entry would be access to the SS7 network, not as easy as hopping on the Internet, but certainly not much of a challenge.

---
Christopher Aloi
Sent from my iPhone

On Apr 21, 2016, at 11:52 AM, Kidd Filby <kiddfilby at gmail.com<mailto:kiddfilby at gmail.com>> wrote:

There is no VOICE traversing the SS7 network, so you cannot possibly record a conversation by having access to the SS7 network only.

On Thu, Apr 21, 2016 at 9:36 AM, Matthew Yaklin <myaklin at firstlight.net<mailto:myaklin at firstlight.net>> wrote:

In other words the hacker has to have working SS7 trunks or access to someone who does? That is how I understood it.

Not exactly a remote hack from mom's basement sort of thing.

Matt

________________________________________
From: VoiceOps <voiceops-bounces at voiceops.org<mailto:voiceops-bounces at voiceops.org>> on behalf of Peter Rad. <peter at 4isps.com<mailto:peter at 4isps.com>>
Sent: Thursday, April 21, 2016 11:25 AM
To: voiceops at voiceops.org<mailto:voiceops at voiceops.org>
Subject: [VoiceOps] SS7

FYI...

  U.S. carriers mum on 60 Minutes report on vulnerability in SS7 -
http://www.fiercewireless.com/story/us-carriers-mum-60-minutes-report-vulnerability-ss7/2016-04-19

Regards,

Peter Radizeski
RAD-INFO, Inc.
813.963.5884<tel:813.963.5884>
http://rad-info.net
* Need bandwidth or colocation? call me
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