Operating System:

[Win]

Published:

23 March 2018

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0835
                             Beckhoff TwinCAT
                               23 March 2018

===========================================================================

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

Product:           Beckhoff TwinCAT
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Administrator Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-7502  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-081-02

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Advisory (ICSA-18-081-02)

Beckhoff TwinCAT

Original release date: March 22, 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/.

CVSS v3 7.8

ATTENTION: Low skill level to exploit.

Vendor: Beckhoff

Equipment: TwinCAT

Vulnerability: Untrusted Pointer Dereference

AFFECTED PRODUCTS

Beckhoff reports that the vulnerability affects the following TwinCAT PLC
products:

  o TwinCAT 3.1 Build 4022.4 or prior,
  o TwinCAT 2.11 R3 2259 or prior, and
  o TwinCAT 3.1 C++ / Matlab (TC1210/TC1220/TC1300/TC1320).

IMPACT

Successful exploitation of this vulnerability could allow local attackers to
escalate privileges.

MITIGATION

Beckhoff recommends users update to the newest version and recompile Matlab
modules after updating.

Please see Beckhoff Security Advisory 2018-001 at the following location for
more information:

https://download.beckhoff.com/download/Document/product-security/Advisories/
advisory-2018-001.pdf

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

  o Restrict machine access to only those who need it.
  o Don't share usernames or passwords.
  o Monitor and respond to suspicious behavior.

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
in the NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber
Intrusion Detection and Mitigation Strategies, that is available for download
from the ICS-CERT website.

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.

No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely.

VULNERABILITY OVERVIEW

UNTRUSTED POINTER DEREFERENCE CWE-822

Several kernel drivers lack proper validation of user-supplied pointer values.
An attacker who is able to execute code on the target may be able to exploit
this vulnerability to obtain SYSTEM privileges.

CVE-2018-7502 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H
/I:H/A:H).

RESEARCHER

Steven Seeley of Source Incite reported this vulnerability to NCCIC.

BACKGROUND

Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water and
Wastewater Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany

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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