ESB-2018.2100 - [Win] PEPPERL+FUCHS VisuNet RM, VisuNet PC, and Box Thin Client: Access confidential data - Remote with user interaction 2018-07-19

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2100
        Advisory (ICSA-18-198-03) PEPPERL+FUCHS VisuNet RM, VisuNet
                          PC, and Box Thin Client
                               19 July 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           PEPPERL+FUCHS VisuNet RM, VisuNet PC, and Box Thin Client
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Access Confidential Data -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0886 CVE-2018-0866 

Reference:         ASB-2018.0056
                   ASB-2018.0043

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-198-03

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Advisory (ICSA-18-198-03)

PEPPERL+FUCHS VisuNet RM, VisuNet PC, and Box Thin Client

Original release date: July 17, 2018

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
provided "as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/.

1. EXECUTIVE SUMMARY

  o CVSS v3 7.5
  o Vendor: PEPPERL+FUCHS
  o Equipment: VisuNet RM, VisuNet PC, Box Thin Client (BTC)
  o Vulnerability: Improper Authentication

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow attackers to
intercept sensitive communications, establish a man-in-the-middle attack,
achieve administrator privileges, and execute remote code.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following PEPPERL+FUCHS product families are affected:

  o VisuNet RM All models,
  o VisuNet PC All models, and
  o BTC All models.

3.2 VULNERABILITY OVERVIEW

3.2.1    IMPROPER AUTHENTICATION CWE-287

An authentication vulnerability within CredSSP may allow interception of user
credentials resulting in remote code execution.

CVE-2018-0886 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is (AV: N/AC:H/PR:N/UI:R/S:U/
C:H/I:H/A:H).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Communications, Critical Manufacturing,
    Information Technology
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Eyal Karni, Yaron Zinar, and Roman Blachman with Preempt Research Labs reported
this vulnerability to PEPPRL+FUCHS, who then reported it to NCCIC.

4. MITIGATIONS

PEPPRL+FUCHS recommends users using HMI devices within VisuNet RM, VisuNet PC
or BTC product families follow these guidelines:

  o PEPPRL+FUCHS HMI devices running RM Shell 4 should be updated with 'RM
    Image 4 Security Patches 01/2017 to 05/2018' (18-33400C):

https://www.pepperl-fuchs.com/cgi-bin/db/doci.pl/?ShowDocByDocNo=18-33400c

  o PEPPRL+FUCHS HMI devices running RM Shell 5 should be updated with 'RM
    Image 5 Security: Windows Cumulative Security Patch 07/2018' (18-33624):

https://www.pepperl-fuchs.com/cgi-bin/db/doci.pl/?ShowDocByDocNo=18-33624

  o PEPPRL+FUCHS HMI devices running Windows 7 or Windows 10 should be updated
    by using the Windows Update mechanism. See Microsoft's security bulletin
    for more information:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/
CVE-2018-0866

  o After deploying the patch, all connected third-party clients or servers
    must use the latest version of the CredSSP protocol.
  o Be aware of the importance of installing these patches, as security will be
    enforced by the update. Security by default restriction might result in an
    error due to encryption oracle remediation. Updates should be installed on
    both the server and the HMI device; otherwise, system compatibility might
    be influenced.

For more information CERT@VDE has released a security advisory found at:

https://cert.vde.com/de-de/advisories/vde-2018-008

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

  o Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet.
  o Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  o When remote access is required, use secure methods, such as Virtual Private
    Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
    be updated to the most current version available. Also recognize that VPN
    is only as secure as the connected devices.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies.

Additional mitigation guidance and recommended practices are publicly available
on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies.

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.

NCCIC also recommends that users take the following measures to protect
themselves from social engineering attacks:

  o Do not click web links or open unsolicited attachments in email messages.
  o Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
  o Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely. High skill level is needed to
exploit.

Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://
ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

The NCCIC continuously strives to improve its products and services. You can
help by choosing one of the links below to provide feedback about this product.

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