ESB-2017.2990 - [Appliance] Phoenix Contact devices: Multiple vulnerabilities 2017-11-22

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2990
       Multiple Phoenix Contact products vulnerable to KRACK Attack
                             22 November 2017

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

Product:           Phoenix Contact devices
Publisher:         Phoenix Contact
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-13080 CVE-2017-13078 CVE-2017-13077

Reference:         ESB-2017.2905
                   ESB-2017.2620
                   ESB-2017.2599

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-325-01

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Advisory (ICSA-17-325-01)

PHOENIX CONTACT WLAN Capable Devices using the WPA2 Protocol

Original release date: November 21, 2017

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
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For more information about TLP, see http://www.us-cert.gov/tlp/.

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CVSS v3 6.8

ATTENTION: Public exploits are available.

Vendor: PHOENIX CONTACT

Equipment: WLAN capable devices using the WPA2 Protocol

Vulnerabilities: Reusing a Nonce

AFFECTED PRODUCTS

PHOENIX CONTACT reports that these vulnerabilities affect all versions of the
following WLAN capable devices using the WPA2 Protocol:

  * BL2 BPC,
  * BL2 PPC,
  * FL COMSERVER WLAN 232/422/485,
  * FL WLAN 110x,
  * FL WLAN 210x,
  * FL WLAN 510x,
  * FL WLAN 230 AP 802-11,
  * FL WLAN 24 AP 802-11,
  * FL WLAN 24 DAP 802-11,
  * FL WLAN 24 EC 802-11,
  * FL WLAN EPA,
  * FL WLAN SPA,
  * ITC 8113,
  * RAD-80211-XD,
  * RAD-WHG/WLAN-XD,
  * TPC 6013,
  * VMT 30xx,
  * VMT 50xx, and
  * VMT 70xx.

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

PHOENIX CONTACT has reported that users operating embedded devices in AP mode
are not affected by these vulnerabilities. PHOENIX CONTACT is actively working
on discovering how these vulnerabilities affect its products and plans to
release future updates as they become available. For more information, please
see the advisory at this location:

https://cert.vde.com/de-de/advisories/vde-2017-003

PHOENIX CONTACT recommends that users apply the security update provided by
Microsoft at the following location for devices running Microsoft Windows:

https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/
CVE-2017-13080

If WPA-TKIP is being used for WLAN configuration, PHOENIX CONTACT recommends
the user switch to AES-CCMP immediately.

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.

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

These vulnerabilities are not remotely exploitable. High skill level is needed
to exploit.

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 in the four-way handshake,

CVE-2017-13078: reinstallation of the group key in the four-way handshake, and

CVE-2017-13080: reinstallation of the group key in the group key handshake,

A CVSS v3 base score of 6.8 has been assigned; the CVSS vector string is (AV:A/
AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).

RESEARCHER

Mathy Vanhoef of imec-DistriNet, KU Leuven discovered these vulnerabilities.
PHOENIX CONTACT reported these vulnerabilities to CERT@VDE. CERT@VDE
coordinated these vulnerabilities with ICS-CERT.

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