ESB-2019.1311 - [Appliance] WAGO Series 750-88x and 750-87x PLCs: Multiple vulnerabilities 2019-04-17

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1311
         Advisory (ICSA-19-106-02) WAGO Series 750-88x and 750-87x
                               17 April 2019

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

Product:           WAGO Series 750-88x and 750-87x PLCs
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Increased Privileges            -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-10712  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-106-02

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TITLE: 

Advisory (ICSA-19-106-02)

WAGO Series 750-88x and 750-87x

Original release date: April 16, 2019

Legal Notice

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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 9.8
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: WAGO
  o Equipment: Series 750-88x and 750-87x
  o Vulnerability: Use of Hard-coded Credentials

2. RISK EVALUATION

This vulnerability allows a remote attacker to change the settings or alter the
programming of the device.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Series 750-88x and 750-87x, programmable logic
controllers, are affected:

  o Series 750-88x
       750-330 firmware versions prior to FW14
       750-352 firmware versions prior to FW14
       750-829 firmware versions prior to FW14
       750-831 firmware versions prior to FW14
       750-852 firmware versions prior to FW14
       750-880 firmware versions prior to FW14
       750-881 firmware versions prior to FW14
       750-882 firmware versions prior to FW14
       750-884 firmware versions prior to FW14
       750-885 firmware versions prior to FW14
       750-889 firmware versions prior to FW14
  o Series 750-87x
       750-830 firmware versions prior to FW06
       750-849 firmware versions prior to FW08
       750-871 firmware versions prior to FW11
       750-872 firmware versions prior to FW07
       750-873 firmware versions prior to FW07

3.2 VULNERABILITY OVERVIEW

3.2.1 USE OF HARD-CODED CREDENTIALS CWE-798

By exploiting the undocumented service access, it is possible to change the
settings of a device and access web-based management with administrator
privileges. An attacker can exploit this vulnerability to lock other users out
from the device or open closed network ports. It is also possible to use this
service access as an FTP user and exchange or delete the application.

CVE-2019-10712 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical
    Manufacturing, Energy, Transportation Systems
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: United States, Germany, Switzerland, Poland,
    China, India

3.4 RESEARCHER

Reported by Jorn Schneeweisz/Recurity Labs to CERT-Bund coordinated by CERT@VDE
with NCCIC.

4. MITIGATIONS

WAGO released a security advisory available at:

https://www.wago.com/de/download/public/Sicherheitshinweis-SA-SYS-2019-001/
SA-SYS-2019-001.pdf

WAGO recommends updating to the newest firmware as listed above and taking the
following defensive measures:

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

CERT@VDE has published an advisory regarding this vulnerability at the
following location:

https://cert.vde.com/en-us/advisories/vde-2019-008

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.

No known public exploits specifically target this vulnerability.

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