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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0123
         Advisory (icsa-21-012-01) Schneider Electric EcoStruxure
                            Power Build-Rapsody
                              13 January 2021

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

Product:           Schneider Electric EcoStruxure Power Build-Rapsody
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2021-22698 CVE-2021-22697 

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-21-012-01

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ICS Advisory (ICSA-21-012-01)

Schneider Electric EcoStruxure Power Build-Rapsody

Original release date: January 12, 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
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 https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.8
  o ATTENTION: Low skill level to exploit
  o Vendor: Schneider Electric
  o Equipment: EcoStruxure Power Build - Rapsody
  o Vulnerability: Unrestricted Upload of File with Dangerous Type

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow a local attacker to
upload a malicious SSD file, resulting in a use-after-free condition or a
stack-based buffer overflow.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

EcoStruxure Power Build - Rapsody software Versions 2.1.13 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS TYPE CWE-434

When a malicious SSD file is uploaded and improperly parsed, an attacker could
cause a use-after-free condition or stack-based buffer overflow resulting in
remote code execution.

CVE-2021-22697 and CVE-2021-22698 have been assigned to this vulnerability. A
CVSS v3 base score of 7.8 has been assigned; the CVSS vector string is ( AV:L/
AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Energy, Food and
    Agriculture, Government Facilities, Transportation Systems, Water and
    Wastewater Systems
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: France

3.4 RESEARCHER

rgod, working with Trend Micro's Zero Day Initiative, reported this
vulnerability to CISA.

4. MITIGATIONS

Schneider Electric reports fixes will be available in the first half of 2021.
Until then, Schneider recommends affected users immediately apply the following
mitigations to reduce the risk of exploit:

  o Apply the principle of least privilege to limit access to the computer
    running the Rapsody software.
  o Install application whitelisting software on the computer to block the
    execution of malicious code.
  o Install antivirus on the computer and keep it up to date.

All updates, including details on affected products and remediation plans, can
be found by subscribing to Schneider Electric's security notification service .

CISA 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.

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 this vulnerability. This
vulnerability is not exploitable remotely.

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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