<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>It's been a decade since I've touched SS7, and I barely remember what I had for breakfast, so it's like it's all new to me again.</div><div><br></div><div>From what I read, it sounds like there may be a "proxy" function that can be injected which would bring both endpoints back to you so you can record both legs. The 60 Minutes piece shows exactly that. And, while it was done in seconds for TV, we all know there was a lot of prep work required ahead of time to make it that simple.</div><div><br></div><div>Question, though: does the proliferation of SMS gateway services open a security risk since they may be bridging IP to SS7?</div><div><br>On Apr 21, 2016, at 14:13, Paul Timmins <<a href="mailto:paul@timmins.net">paul@timmins.net</a>> wrote:<br><br></div><div>
<meta content="text/html; charset=windows-1252" http-equiv="Content-Type">
<div class="moz-cite-prefix">You could do it by saying "hey, this
handset is roaming on me" then directing the call back to the
handset in question, I figure. It would be inbound only intercept,
but i could see that working.<br>
<br>
-Paul<br>
<br>
On 04/21/2016 02:12 PM, Matthew Yaklin wrote:<br>
</div>
<blockquote cite="mid:BLUPR0401MB17303D2F53AF656AAFC9BCEFDA6E0@BLUPR0401MB1730.namprd04.prod.outlook.com" type="cite">
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<p><br>
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<p>The part I was curious about and perhaps someone can clarify
who has more knowledge than I is...</p>
<p><br>
</p>
<p>It appears in order to record calls the attacker has to be in
very close proximity to the target. Like radio/tower range.</p>
<p>You cannot record a conversation half way across the world.</p>
<p><br>
</p>
<p>Matt</p>
<br>
<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b>
VoiceOps <a class="moz-txt-link-rfc2396E" href="mailto:voiceops-bounces@voiceops.org"><voiceops-bounces@voiceops.org></a> on behalf
of Matthew Yaklin <a class="moz-txt-link-rfc2396E" href="mailto:myaklin@firstlight.net"><myaklin@firstlight.net></a><br>
<b>Sent:</b> Thursday, April 21, 2016 2:09 PM<br>
<b>To:</b> Kidd Filby; Chris Aloi<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:voiceops@voiceops.org">voiceops@voiceops.org</a><br>
<b>Subject:</b> Re: [VoiceOps] SS7</font>
<div> </div>
</div>
<div>
<div id="divtagdefaultwrapper" style="font-size:12pt;
color:#000000; background-color:#FFFFFF;
font-family:Calibri,Arial,Helvetica,sans-serif">
<p><br>
</p>
<p>Here is a paper that may shed some light on the
discussion for the curious.</p>
<p><br>
</p>
<p><a moz-do-not-send="true" href="https://www.sans.org/reading-room/whitepapers/critical/fall-ss7--critical-security-controls-help-36225" id="LPlnk600737" title="https://www.sans.org/reading-room/whitepapers/critical/fall-ss7--critical-security-controls-help-36225
Ctrl+Click
or tap to follow the link">https://www.sans.org/reading-room/whitepapers/critical/fall-ss7--critical-security-controls-help-36225</a></p>
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<a moz-do-not-send="true" id="LPUrlAnchor_14612622330100.32622934630536204" href="https://www.sans.org/reading-room/whitepapers/critical/fall-ss7--critical-security-controls-help-36225" target="_blank" style="text-decoration:none">SANS
Institute InfoSec Reading Room</a></div>
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The Fall of SS7 Ð How Can the Critical
Security Controls Help? 4 "
#$$#%!&'()#*+!"#$$#%,-')#*./-#01,2'-! area
notices this registration and transfers to a
Visitor ...</div>
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<br>
<br>
<br>
<div style="color:rgb(0,0,0)">
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Kidd Filby
<a class="moz-txt-link-rfc2396E" href="mailto:kiddfilby@gmail.com"><kiddfilby@gmail.com></a><br>
<b>Sent:</b> Thursday, April 21, 2016 2:01 PM<br>
<b>To:</b> Chris Aloi<br>
<b>Cc:</b> Matthew Yaklin; <a class="moz-txt-link-abbreviated" href="mailto:voiceops@voiceops.org">voiceops@voiceops.org</a><br>
<b>Subject:</b> Re: [VoiceOps] SS7</font>
<div> </div>
</div>
<div>
<div dir="ltr">
<div class="gmail_default" style="font-family:comic
sans ms,sans-serif">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.<br>
<br>
</div>
<div class="gmail_default" style="font-family:comic
sans ms,sans-serif">I cannot comment on CALEA<br>
<br>
</div>
<div class="gmail_default" style="font-family:comic
sans ms,sans-serif">Kidd<br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Apr 21, 2016 at
10:56 AM, Chris Aloi <span dir="ltr">
<<a moz-do-not-send="true" href="mailto:ctaloi@gmail.com" target="_blank">ctaloi@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0
0 .8ex; border-left:1px #ccc solid;
padding-left:1ex">
<div dir="auto">
<div>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. </div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>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. </div>
<div><br>
</div>
<div>
<div>---</div>
<div>Christopher Aloi</div>
Sent from my iPhone</div>
<div>
<div class="h5">
<div><br>
On Apr 21, 2016, at 11:52 AM, Kidd Filby
<<a moz-do-not-send="true" href="mailto:kiddfilby@gmail.com" target="_blank">kiddfilby@gmail.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<div dir="ltr">
<div class="gmail_default" style="font-family:comic sans
ms,sans-serif">There is no VOICE
traversing the SS7 network, so you
cannot possibly record a
conversation by having access to
the SS7 network only.<br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Apr
21, 2016 at 9:36 AM, Matthew
Yaklin <span dir="ltr">
<<a moz-do-not-send="true" href="mailto:myaklin@firstlight.net" target="_blank">myaklin@firstlight.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;
border-left:1px #ccc solid;
padding-left:1ex">
<br>
In other words the hacker has to
have working SS7 trunks or
access to someone who does? That
is how I understood it.<br>
<br>
Not exactly a remote hack from
mom's basement sort of thing.<br>
<br>
Matt<br>
<br>
________________________________________<br>
From: VoiceOps <<a moz-do-not-send="true" href="mailto:voiceops-bounces@voiceops.org" target="_blank"></a><a class="moz-txt-link-abbreviated" href="mailto:voiceops-bounces@voiceops.org">voiceops-bounces@voiceops.org</a>>
on behalf of Peter Rad. <<a moz-do-not-send="true" href="mailto:peter@4isps.com" target="_blank"></a><a class="moz-txt-link-abbreviated" href="mailto:peter@4isps.com">peter@4isps.com</a>><br>
Sent: Thursday, April 21, 2016
11:25 AM<br>
To: <a moz-do-not-send="true" href="mailto:voiceops@voiceops.org" target="_blank">voiceops@voiceops.org</a><br>
Subject: [VoiceOps] SS7<br>
<div>
<div><br>
FYI...<br>
<br>
U.S. carriers mum on 60
Minutes report on
vulnerability in SS7 -<br>
<a moz-do-not-send="true" href="http://www.fiercewireless.com/story/us-carriers-mum-60-minutes-report-vulnerability-ss7/2016-04-19" rel="noreferrer" target="_blank">http://www.fiercewireless.com/story/us-carriers-mum-60-minutes-report-vulnerability-ss7/2016-04-19</a><br>
<br>
Regards,<br>
<br>
Peter Radizeski<br>
RAD-INFO, Inc.<br>
<a moz-do-not-send="true" href="tel:813.963.5884" value="+18139635884" target="_blank">813.963.5884</a><br>
<a moz-do-not-send="true" href="http://rad-info.net" rel="noreferrer" target="_blank">http://rad-info.net</a><br>
* Need bandwidth or
colocation? call me<br>
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-- <br>
<div>
<div dir="ltr">Kidd Filby<br>
<a moz-do-not-send="true" href="tel:661.557.5640" value="+16615575640" target="_blank">661.557.5640</a>
(C)<br>
<a moz-do-not-send="true" href="http://www.linkedin.com/in/kiddfilby" title="View public profile" name="m_6600178105790939021_UNIQUE_ID_SafeHtmlFilter_SafeHtmlFilter_webProfileURL" target="_blank">http://www.linkedin.com/in/kiddfilby</a><br>
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<div class="gmail_signature">
<div dir="ltr">Kidd Filby<br>
661.557.5640 (C)<br>
<a moz-do-not-send="true" href="http://www.linkedin.com/in/kiddfilby" title="View public profile" name="UNIQUE_ID_SafeHtmlFilter_SafeHtmlFilter_webProfileURL" target="_blank">http://www.linkedin.com/in/kiddfilby</a><br>
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