ESB-2017.3247 - [Win][Android] PEPPERL+FUCHS/ecom instruments: Multiple vulnerabilities 2017-12-20

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.3247
       KRACK attacks patched/mitigated in industrial control tablets
                             20 December 2017

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

Product:           Tab-Ex 01
                   Ex-Handy 09
                   Ex-Handy 209
                   Smart-Ex 01
                   Smart-Ex 201
                   Pad-Ex 01
                   i.roc Ci70-Ex
                   CK70A-ATEX
                   CK71A-ATEX
                   CN70A-ATEX
                   CN70E-ATEX
Publisher:         PEPPERL+FUCHS/ecom instruments
Operating System:  Android
                   Windows
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated      
                   Provide Misleading Information -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-13088 CVE-2017-13087 CVE-2017-13086
                   CVE-2017-13082 CVE-2017-13081 CVE-2017-13080
                   CVE-2017-13079 CVE-2017-13078 CVE-2017-13077

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-353-02

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ATTENTION: Low skill level is needed to exploit. Public exploits are available.

Vendor: PEPPERL+FUCHS/ecom instruments

Equipment: WLAN capable devices using the WPA2 Protocol

Vulnerabilities: Reusing a Nonce

AFFECTED PRODUCTS

PEPPERL+FUCHS/ecom instruments reports that these vulnerabilities affect all
versions of the following WLAN capable devices using the WPA2 Protocol:

  * Tab-Ex 01,
  * Ex-Handy 09,
  * Ex-Handy 209,
  * Smart-Ex 01,
  * Smart-Ex 201,
  * Pad-Ex 01,
  * i.roc Ci70-Ex,
  * CK70A-ATEX,
  * CK71A-ATEX,
  * CN70A-ATEX, and
  * CN70E-ATEX.

IMPACT

Successful exploitation of these vulnerabilities could allow an attacker to
operate as a "man-in-the-middle" between the device and the wireless access
point.

MITIGATION

PEPPERL+FUCHS/ecom instruments report the following mitigations:

Android

  * Affected Products: Tab-Ex 01, Ex-Handy 09, Ex-Handy 209, Smart-Ex 01,
    Smart-Ex 201
  * ecom instruments is actively working on these vulnerabilities. This
    advisory will updated as soon as further significant details are provided
    by the vendor, with an emphasis on information about available patches.

Windows

  * Affected Products: Pad-Ex 01, i.roc Ci70-Ex, CK70A-ATEX, CK71A-ATEX,
    CN70A-ATEX, CN70E-ATEX
  * For ecom instruments devices running Windows, ecom instruments recommends
    users apply the security update provided by Microsoft. If users are using
    WPA-TKIP in their WLAN, users should switch to AES-CCMP immediately.

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

https://cert.vde.com/de-de/advisories/vde-2017-005

NCCIC/ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. Specifically, users should:

  * Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet.
  * Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  * 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.

ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

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

VULNERABILITY OVERVIEW

REUSING A NONCE, KEY PAIR IN ENCRYPTION CWE-323

Multiple products are affected by key reinstallation attacks known as KRACK.
The four-way hand shake traffic in the Wi-Fi Protected Access WPA and WPA2
protocol can be manipulated to allow nonce reuse resulting in key
reinstallation. This could allow an attacker to execute a ?man-in-the-middle?
attack, enabling the attacker within radio range to replay, decrypt, or spoof
frames.

The following CVEs have been assigned to this group of vulnerabilities:

CVE-2017-13077: Reinstallation of the pairwise key during the four-way
handshake.

CVE-2017-13078: Reinstallation of the group key during the four-way handshake.

CVE-2017-13079: Reinstallation of the Integrity Group Temporal Key (IGTK)
during the four-way handshake.

CVE-2017-13080: Reinstallation of the group key during the group key handshake.

CVE-2017-13081: Reinstallation of the IGTK during the group key handshake.

CVE-2017-13082: Reinstallation of the Pairwise Transient Key (PTK) Temporal Key
(TK) during the fast BSS transmission (FT) handshake.

CVE-2017-13086: Reinstallation of the Tunneled Direct-Link Setup (TDLS) Peer
Key (TPK) during the TDLS handshake.

CVE-2017-13087: Reinstallation of the Group Temporal Key (GTK) when processing
a Wireless Network Management (WNM) Sleep Mode Response frame.

CVE-2017-13088: Reinstallation of the IGTK when processing a WNM Sleep Mode
Response frame.

A CVSS v3 base score of 8.1 has been assigned; the CVSS vector string is (AV:A/
AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).

RESEARCHER

Mathy Vanhoef of imec-DistriNet, KU Leuven discovered these vulnerabilities.
PEPPERL+FUCHS reported to CERT@VDE that their products are affected. CERT@VDE
coordinated these vulnerabilities with ICS-CERT.

BACKGROUND

Critical Infrastructure Sectors: Communications, Critical Manufacturing,
Information Technology

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?

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