ManageEngine ADSelfService Plus < build 6114 REST API Authentication Bypass - Nessus

Critical   Plugin ID: 153147

This page contains detailed information about the ManageEngine ADSelfService Plus < build 6114 REST API Authentication Bypass Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents
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Plugin Overview

ID: 153147
Name: ManageEngine ADSelfService Plus < build 6114 REST API Authentication Bypass
Filename: manageengine_adselfservice_6114.nasl
Vulnerability Published: 2021-09-07
This Plugin Published: 2021-09-08
Last Modification Time: 2022-03-08
Plugin Version: 1.9
Plugin Type: remote
Plugin Family: CGI abuses
Dependencies: manageengine_adselfservice_detect.nasl
Required KB Items [?]: installed_sw/ManageEngine ADSelfService Plus

Vulnerability Information

Severity: Critical
Vulnerability Published: 2021-09-07
Patch Published: 2021-09-07
CVE [?]: CVE-2021-40539
CPE [?]: cpe:/a:zohocorp:manageengine_adselfservice_plus

Synopsis

A web application is affected by an authentication bypass vulnerability.

Description

According to its self-reported version, the ManageEngine ADSelfService Plus application running on the remote host is prior to build 6114. It is, therefore, affected by an authentication bypass vulnerability affecting REST API URLs. An unauthenticated, remote attacker can exploit this to bypass authentication and execute arbitrary code.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported build number.

Solution

Upgrade to ManageEngine ADSelfService Plus build 6114 or later.

Public Exploits

Target Network Port(s): 8888
Target Asset(s): Services/www
Exploit Available: True (Metasploit Framework, GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the ManageEngine ADSelfService Plus < build 6114 REST API Authentication Bypass vulnerability:

  1. Metasploit: exploit/windows/http/manageengine_adselfservice_plus_cve_2021_40539
    [ManageEngine ADSelfService Plus CVE-2021-40539]
  2. GitHub: https://github.com/Mr-xn/Penetration_Testing_POC
    [CVE-2021-40539]
  3. GitHub: https://github.com/r0eXpeR/supplier
    [CVE-2021-40539]
  4. GitHub: https://github.com/DarkSprings/CVE-2021-40539
    [CVE-2021-40539: CVE-2021-40539 POC]
  5. GitHub: https://github.com/synacktiv/CVE-2021-40539
    [CVE-2021-40539: Exploitation code for CVE-2021-40539]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2021-40539
CVSS V2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P/E:H/RL:OF/RC:C
CVSS Base Score:7.5 (High)
Impact Subscore:6.4
Exploitability Subscore:10.0
CVSS Temporal Score:6.5 (Medium)
CVSS Environmental Score:NA (None)
Modified Impact Subscore:NA
Overall CVSS Score:6.5 (Medium)
CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C
CVSS Base Score:9.8 (Critical)
Impact Subscore:5.9
Exploitability Subscore:3.9
CVSS Temporal Score:9.4 (Critical)
CVSS Environmental Score:NA (None)
Modified Impact Subscore:NA
Overall CVSS Score:9.4 (Critical)
STIG Severity [?]: I
STIG Risk Rating: High

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Plugin Source

This is the manageengine_adselfservice_6114.nasl nessus plugin source code. This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof. 

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(153147);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/03/08");

  script_cve_id("CVE-2021-40539");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/11/17");
  script_xref(name:"IAVA", value:"2021-A-0561");

  script_name(english:"ManageEngine ADSelfService Plus < build 6114 REST API Authentication Bypass");

  script_set_attribute(attribute:"synopsis", value:
"A web application is affected by an authentication bypass vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the ManageEngine ADSelfService Plus application running on the remote host is
prior to build 6114. It is, therefore, affected by an authentication bypass vulnerability affecting REST API URLs. An
unauthenticated, remote attacker can exploit this to bypass authentication and execute arbitrary code.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported build
number.");
  # https://www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?74285241");
  script_set_attribute(attribute:"solution", value:
"Upgrade to ManageEngine ADSelfService Plus build 6114 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-40539");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'ManageEngine ADSelfService Plus CVE-2021-40539');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/09/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/09/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/09/08");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:zohocorp:manageengine_adselfservice_plus");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("manageengine_adselfservice_detect.nasl");
  script_require_keys("installed_sw/ManageEngine ADSelfService Plus");
  script_require_ports("Services/www", 8888);

  exit(0);
}

include('vcf.inc');
include('vcf_extras_zoho.inc');
include('http.inc');

var app, app_info, constraints, port;

app = 'ManageEngine ADSelfService Plus';

# Exit if app is not detected on this http port
port = get_http_port(default:8888);

app_info = vcf::zoho::fix_parse::get_app_info(
  app: app,
  port:  port,
  webapp: TRUE
);

constraints = [
  { 'fixed_version':'6114', 'fixed_display':'build 6114'}
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);

The latest version of this script can be found in these locations depending on your platform:

  • Linux / Unix:
    /opt/nessus/lib/nessus/plugins/manageengine_adselfservice_6114.nasl
  • Windows:
    C:\ProgramData\Tenable\Nessus\nessus\plugins\manageengine_adselfservice_6114.nasl
  • Mac OS X:
    /Library/Nessus/run/lib/nessus/plugins/manageengine_adselfservice_6114.nasl

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How to Run

Here is how to run the ManageEngine ADSelfService Plus < build 6114 REST API Authentication Bypass as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

  1. Click to start a New Scan.
  2. Select Advanced Scan.
  3. Navigate to the Plugins tab.
  4. On the top right corner click to Disable All plugins.
  5. On the left side table select CGI abuses plugin family.
  6. On the right side table select ManageEngine ADSelfService Plus < build 6114 REST API Authentication Bypass plugin ID 153147.
  7. Specify the target on the Settings tab and click to Save the scan.
  8. Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl manageengine_adselfservice_6114.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a manageengine_adselfservice_6114.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - manageengine_adselfservice_6114.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state manageengine_adselfservice_6114.nasl -t <IP/HOST>

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References

IAVA | Information Assurance Vulnerability Alert:
  • 2021-A-0561
See also: Similar and related Nessus plugins:
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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file manageengine_adselfservice_6114.nasl version 1.9. For more plugins, visit the Nessus Plugin Library.

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