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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.2117
        Advisory (ICSA-19-164-02) WAGO Industrial Managed Switches
                      852-303, 852-1305, and 852-1505
                               14 June 2019

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

Product:           WAGO Industrial Managed Switches
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Root Compromise -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-12550 CVE-2019-12549 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-164-02

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Advisory (ICSA-19-164-02)

WAGO Industrial Managed Switches 852-303, 852-1305, and 852-1505

Original release date: June 13, 2019

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
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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 9.8
  o ATTENTION : Exploitable remotely/low skill level to exploit
  o Vendor : WAGO
  o Equipment : Industrial Managed Switches 852-303, 852-1305, and 852-1505
  o Vulnerabilities : Use of Hard-coded Credentials, Use of Hard-coded
    Cryptographic Key, Using Components with Known Vulnerabilities

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow a compromise of
the managed switch, resulting in disruption of communication, and root access
to the operating system.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

WAGO reports these vulnerabilities affect the following industrial managed
switches:

  o 852-303: All versions prior to v1.2.2.S0
  o 852-1305: All versions prior to v1.1.6.S0
  o 852-1505: All versions prior to v1.1.5.S0

3.2 VULNERABILITY OVERVIEW

3.2.1 USE OF HARD-CODED CREDENTIALS CWE-798

An attacker with access to the hard-coded credentials may gain access to the
operating system of the managed switch with root privileges, which may allow
manipulation of the operating system of the managed switch.

CVE-2019-12550 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).

3.2.2 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321

An attacker with access to the hard-coded SSH key may disrupt communication or
compromise the managed switch. The SSH-keys cannot be regenerated by users and
all switches use the same key.

CVE-2019-12549 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).

3.2.3 USING COMPONENTS WITH KNOWN VULNERABILITIES

The listed managed switches use outdated third-party components with known
vulnerabilities. See the full list of CVE identifiers in CERT@VDE advisory
number VDE-2019-013 .

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

T. Weber of SEC Consult Vulnerability Lab reported these vulnerabilities to
CERT@VDE.

4. MITIGATIONS

WAGO recommends users update their managed switch to the latest firmware
published June 7, 2019, or later. New firmware can be requested in the Runtime
Software dropdown within the Downloads section at the links below:

  o 852-303: v1.2.2.S0 or later

https://www.wago.com/us/switches/industrial-managed-switch/p/852-303

  o 852-1305: v1.1.6.S0 or later

https://www.wago.com/us/switches/industrial-managed-switch/p/852-1305

  o 852-1505: v1.1.5.S0 or later

https://www.wago.com/us/switches/industrial-managed-switch/p/852-1505

WAGO also recommends users implement the following security measures:

  o Restrict network access to the switch
  o Restrict network access to the SSH server.
  o Do not directly connect the device to the Internet.

For more information CERT@VDE has released a security notification which can be
viewed at the following link:
https://cert.vde.com/en-us/advisories/vde-2019-013

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

  o Implement access control lists.
  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.

No known public exploits specifically target these vulnerabilities.

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