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AUSCERT External Security Bulletin Redistribution
ESB-2021.0297
Advisory (icsa-21-026-01) Fuji Electric Tellus Lite
V-Simulator and V-Server Lite
27 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Fuji Electric Tellus Lite V-Simulator and V-Server Lite
Publisher: ICS-CERT
Operating System: Windows
Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-22655 CVE-2021-22653 CVE-2021-22641
CVE-2021-22639 CVE-2021-22637
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-026-01
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ICS Advisory (ICSA-21-026-01)
Fuji Electric Tellus Lite V-Simulator and V-Server Lite
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 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Fuji Electric
o Equipment: Tellus Lite V-Simulator and V-Server Lite
o Vulnerabilities: Stack-based Buffer Overflow, Out-of-Bounds Read,
Out-of-Bounds Write, Access of Uninitialized Pointer, Heap-based Buffer
Overflow
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
execute code under the privileges of the application.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Fuji Electric products are affected:
o Tellus Lite V-Simulator: Versions prior to v4.0.10.0
o V-Server Lite: Versions prior to v4.0.10.0
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
Multiple stack-based buffer overflow issues have been identified in the way the
application processes project files, allowing an attacker to craft a special
project file that may allow arbitrary code execution.
CVE-2021-22637 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.2 OUT-OF-BOUNDS READ CWE-125
Multiple out-of-bounds read issues have been identified in the way the
application processes project files, allowing an attacker to craft a special
project file that may allow arbitrary code execution.
CVE-2021-22655 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.3 OUT-OF-BOUNDS WRITE CWE-787
Multiple out-of-bounds write issues have been identified in the way the
application processes project files, allowing an attacker to craft a special
project file that may allow arbitrary code execution.
CVE-2021-22653 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.4 ACCESS OF UNINITIALIZED POINTER CWE-824
An uninitialized pointer issue has been identified in the way the application
processes project files, allowing an attacker to craft a special project file
that may allow arbitrary code execution.
CVE-2021-22639 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.5 HEAP-BASED BUFFER OVERFLOW CWE-122
A heap-based buffer overflow issue has been identified in the way the
application processes project files, allowing an attacker to craft a special
project file that may allow arbitrary code execution.
CVE-2021-22641 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; 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: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
Kimiya, Khangkito - Tran Van Khang of VinCSS (Member of Vingroup), and an
anonymous researcher, working with Trend Micro's Zero Day Initiative, reported
these vulnerabilities to CISA.
4. MITIGATIONS
Fuji Electric recommends updating to the current version v4.0.10.0. Both disks
are required for updating. Login is required to download the files.
o v4.0.10.0 Disk 1
o v4.0.10.0 Disk 2
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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. These
vulnerabilities are 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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