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AUSCERT External Security Bulletin Redistribution
ESB-2021.0078.2
Advisory (icsa-21-007-03) Eaton EASYsoft
28 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Eaton EASYsoft
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-6656 CVE-2020-6655
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-007-03
Revision History: January 28 2021: Vendor updated advisory
January 8 2021: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-21-007-03)
Eaton EASYsoft (Update A)
Original release date: January 26, 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 5.8
o Vendor: Eaton
o Equipment: EASYsoft
o Vulnerabilities: Type Confusion, Out-of-bounds Read
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-21-007-03 Eaton EASYsoft that was published January 7, 2021, to the ICS
webpage on us-cert.cisa.gov.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow a local attacker
to modify or crash the program.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
o Versions 7.20 and prior of EASYsoft are affected
4.2 VULNERABILITY OVERVIEW
4.2.1 ACCESS OF RESOURCE USING INCOMPATIBLE TYPE ('TYPE CONFUSION') CWE-843
The affected product allows a pointer to be read into an object from a file,
resulting in type confusion.
CVE-2020-6656 has been assigned to this vulnerability. A CVSS v3 base score of
5.8 has been assigned; the CVSS vector string is ( AV:L/AC:H/PR:N/UI:R/S:U/C:H/
I:L/A:L ).
4.2.2 OUT-OF-BOUNDS READ CWE-125
The affected product is vulnerable to an out-of-bounds read, which may allow an
attacker to modify or crash the program.
CVE-2020-6655 has been assigned to this vulnerability. A CVSS v3 base score of
5.8 has been assigned; the CVSS vector string is ( AV:L/AC:H/PR:N/UI:R/S:U/C:H/
I:L/A:L ).
4.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Ireland
4.4 RESEARCHER
Francis Provencher {PRL}, working with Trend Micro's Zero Day Initiative,
reported these vulnerabilities to CISA.
5. MITIGATIONS
- --------- Begin Update A Part 1 of 1 ---------
Eaton has patched the issues and released Version 7.22 , which can be
downloaded from Eaton's website.
Navigate to Eaton software download center -> Select "Software" -> "easySoft"
- -> v7.22
- --------- End Update A Part 1 of 1 ---------
Eaton recommends those affected by the report vulnerabilities use only .E70
files created from a fully trusted source.
If the application crashes due to .E70 file upload, restart the application and
do not upload the .E70 file again.
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.
High skill is needed to exploit. These vulnerabilities are not exploitable
remotely. 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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