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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.2281
              Advisory (icsa-21-180-05) AVEVA System Platform
                               30 June 2021

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

Product:           AVEVA System Platform
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account      
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-33010 CVE-2021-33008 

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-21-180-05

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ICS Advisory (ICSA-21-180-05)

AVEVA System Platform

Original release date: June 29, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics 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
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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 https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 8.8
  o ATTENTION: Exploitable from adjacent network/low attack complexity
  o Vendor: AVEVA Software, LLC
  o Equipment: System Platform
  o Vulnerabilities: Missing Authentication for Critical Function, Uncaught
    Exception

2. RISK EVALUATION

Successful exploitation of these vulnerabilities, if exploited and chained
together, could allow a malicious entity to achieve arbitrary code execution
with system privileges or cause a denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

o AVEVA reports the vulnerability affects AVEVA System Platform versions 2017
through 2020 R2 P01 (inclusive)

3.2 VULNERABILITY OVERVIEW

3.2.1 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306

The software does not perform any authentication for functionality that
requires a provable user identity.

CVE-2021-33008 has been assigned to this vulnerability. A CVSS v3 base score of
8.0 has been calculated; the CVSS vector string is ( AV:A/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:H ).

3.2.2 UNCAUGHT EXCEPTION CWE-248

An exception is thrown from a function, but it is not caught, which may cause a
denial-of-service condition.

CVE-2021-33010 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy,
    Food and Agriculture, and Water and Wastewater Systems
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: United Kingdom

3.4 RESEARCHER

Sharon Brizinov of Claroty reported these vulnerabilities to AVEVA.

4. MITIGATIONS

AVEVA recommends organizations evaluate the impact of these vulnerabilities
based on their operational environment, architecture, and product
implementation.

AutoBuild service is intended to be used only on the GR Node of System Platform
during configuration. If the AutoBuild service is enabled on any Runtime nodes,
it should be disabled. Furthermore, if the AutoBuild functionality is not used
on the GR Node, the AutoBuild service can be disabled on the GR Node as an
alternative mitigation that does not require patching.

AVEVA recommends users who need to continually use the AutoBuild functionality
and cannot disable it in System Platform Versions 2017 through 2020 R2 P01
(inclusive) are affected by the vulnerabilities and should first upgrade to one
of the System Platform versions listed below, then apply the corresponding
security update:

  o System Platform 2020 R2 P01, 2020 R2, 2020: Apply AVEVA Communication
    Drivers Pack 2020 R2.1
  o System Platform 2017 U3 SP1 P01:

 1. First apply AVEVA Communication Drivers Pack 2020 R2 AVEVA notes that
    Activated Licensing is required to apply AVEVA Communication Drivers Pack
    2020 R2 on top of System Platform 2017 U3 SP1 P01. For information on AVEVA
    license compatibility, please contact AVEVA Customer Support
 2. Then apply AVEVA Communication Drivers Pack 2020 R2.1

Please see AVEVA's security bulletin AVEVA-2021-002 for more information.

CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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 VPNs may have vulnerabilities and should be
    updated to the most current version available. Also recognize VPN is only
    as secure as its connected devices.

CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.cisa.gov . 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 webpage on us-cert.cisa.gov 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 CISA for tracking
and correlation against other incidents.

No known public exploits specifically target these vulnerabilities.

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

CISA 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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