Schneider (CVE-2018-7812) - Nessus

High   Plugin ID: 500299

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This page contains detailed information about the Schneider (CVE-2018-7812) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Plugin Overview

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ID: 500299
Name: Schneider (CVE-2018-7812)
Filename: tenable_ot_schneider_CVE-2018-7812.nasl
Vulnerability Published: 2018-12-17
This Plugin Published: 2022-02-07
Last Modification Time: 2022-02-07
Plugin Version: 1.1
Plugin Type: remote
Plugin Family: Tenable.ot
Dependencies: tenable_ot_api_integration.nasl
Required KB Items [?]: Tenable.ot/Schneider

Vulnerability Information

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Severity: High
Vulnerability Published: 2018-12-17
Patch Published: 2018-12-17
CVE [?]: CVE-2018-7812
CPE [?]: cpe:/o:schneider-electric:modicom_m340_firmware, cpe:/o:schneider-electric:modicom_premium_firmware, cpe:/o:schneider-electric:modicom_quantum_firmware

Synopsis

The remote OT asset is affected by a vulnerability.

Description

An Information Exposure through Discrepancy vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200 where the web server sends different responses in a way that exposes security- relevant information about the state of the product, such as whether a particular operation was successful or not. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

Public Exploits

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Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (GitHub)
Exploit Ease: Exploits (PoCs) are available

Here's the list of publicly known exploits and PoCs for verifying the Schneider (CVE-2018-7812) vulnerability:

1. GitHub: https://github.com/SadFud/Exploits
   [CVE-2018-7812]

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

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CVSS Score Source [?]: CVE-2018-7812
CVSS V2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Base Score:	5.0 (Medium)
Impact Subscore:	2.9
Exploitability Subscore:	10.0
CVSS Temporal Score:	NA (None)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.0 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS Base Score:	7.5 (High)
Impact Subscore:	3.6
Exploitability Subscore:	3.9
CVSS Temporal Score:	NA (None)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.5 (High)

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Plugin Source

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This is the tenable_ot_schneider_CVE-2018-7812.nasl nessus plugin source code. This script is Copyright (C) 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(500299);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/07");

  script_cve_id("CVE-2018-7812");

  script_name(english:"Schneider (CVE-2018-7812)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"An Information Exposure through Discrepancy vulnerability exists in the embedded web servers in all Modicon M340,
Premium, Quantum PLCs and BMXNOR0200 where the web server sends different responses in a way that exposes security-
relevant information about the state of the product, such as whether a particular operation was successful or not.
This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # https://www.schneider-electric.com/en/download/document/SEVD-2018-327-01/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?36792959");
  # https://github.com/SadFud/Exploits/tree/master/Real%20World/SCADA%20-%20IOT%20Systems/CVE-2018-7812
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d59345d6");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-7812");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(200);

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/12/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/07");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:schneider-electric:modicom_m340_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:schneider-electric:modicom_premium_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:schneider-electric:modicom_quantum_firmware");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

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

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Schneider");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Schneider');

var asset = tenable_ot::assets::get(vendor:'Schneider');

var vuln_cpes = {
    "cpe:/o:schneider-electric:modicom_m340_firmware" : {},
    "cpe:/o:schneider-electric:modicom_premium_firmware" : {},
    "cpe:/o:schneider-electric:modicom_quantum_firmware" : {}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);

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

• Linux / Unix:
  /opt/nessus/lib/nessus/plugins/tenable_ot_schneider_CVE-2018-7812.nasl
• Windows:
  C:\ProgramData\Tenable\Nessus\nessus\plugins\tenable_ot_schneider_CVE-2018-7812.nasl
• Mac OS X:
  /Library/Nessus/run/lib/nessus/plugins/tenable_ot_schneider_CVE-2018-7812.nasl

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How to Run

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Here is how to run the Schneider (CVE-2018-7812) 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 Tenable.ot plugin family.
6. On the right side table select Schneider (CVE-2018-7812) plugin ID 500299.
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 tenable_ot_schneider_CVE-2018-7812.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a tenable_ot_schneider_CVE-2018-7812.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - tenable_ot_schneider_CVE-2018-7812.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 tenable_ot_schneider_CVE-2018-7812.nasl -t <IP/HOST>

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References

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CWE | Common Weakness Enumeration:

• CWE-200 (Weakness) Exposure of Sensitive Information to an Unauthorized Actor

See also:

• https://www.tenable.com/plugins/nessus/500299
• http://www.nessus.org/u?36792959
• http://www.nessus.org/u?d59345d6
• https://vulners.com/nessus/TENABLE_OT_SCHNEIDER_CVE-2018-7812.NASL

Similar and related Nessus plugins:

• 500029 - Schneider (CVE-2013-0662)
• 500074 - Schneider (CVE-2013-0663)
• 500122 - Schneider (CVE-2018-7842)
• 64296 - Schneider Electric Interactive Graphical SCADA System dc.exe Unspecified Buffer Overflow
• 65603 - Schneider Electric Accutech Manager RFManagerService Heap Overflow

Version

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This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file tenable_ot_schneider_CVE-2018-7812.nasl version 1.1. For more plugins, visit the Nessus Plugin Library.

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