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AUSCERT External Security Bulletin Redistribution
ESB-2020.2917.4
Advisory (icsa-20-238-03) WECON LeviStudioU
4 December 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: WECON LeviStudioU
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-25186 CVE-2019-16243
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-238-03
Revision History: December 4 2020: Vendor added additional vulnerabilities to advisory
October 30 2020: vendor minor update to Researcher section
October 22 2020: Additional CVE added to advisory
August 26 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-20-238-03)
WECON LeviStudioU (Update C)
Original release date: December 13, 2020 | Last revised: December 03, 2020
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: WECON Technology Co., Ltd (WECON)
o Equipment: LeviStudioU
- --------- Begin Update C Part 1 of 3 ---------
o Vulnerabilities: Stack-based Buffer Overflow, Improper Restriction of XML
External Entity Reference, Heap-based Buffer Overflow
- --------- End Update C Part 1 of 3 ---------
2. UPDATE INFORMATION
This updated advisory is a follow-up to the advisory update titled
ICSA-20-238-03 WECON LeviStudioU (Update B) that was published October 29,
2020, to the ICS webpage on us-cert.cisa.gov.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
execute code under the privileges of the application and obtain sensitive
information.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following versions of LeviStudioU are reported to be affected:
o LeviStudioU: Release Build 2019-09-21 and prior. If you have questions
about the affected products, please contact WECON.
4.2 VULNERABILITY OVERVIEW
4.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
Multiple buffer overflow vulnerabilities exist when processing project files.
Opening a specially crafted project file could allow an attacker to exploit and
execute code under the privileges of the application.
CVE-2020-16243 has been assigned to these vulnerabilities. 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 ).
4.2.2 IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE CWE-611
An XXE vulnerability exists when processing parameter entities, which may allow
file disclosure.
CVE-2020-25186 has been assigned to this vulnerability. A CVSS v3 base score of
5.5 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:N/A:N ).
- --------- Begin Update C Part 2 of 3 ---------
4.2.3 HEAP-BASED BUFFER OVERFLOW CWE-122
A heap-based buffer overflow vulnerability exists when processing project
files. Opening a specially crafted project file could allow an attacker to
exploit and execute code under the privileges of the application.
CVE-2020-25199 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 ).
- --------- EndUpdate C Part 2 of 3 ---------
4.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: China
4.4 RESEARCHER
- --------- Begin Update C Part 3 of 3 ---------
Natnael Samson and Mehmet D. INCE @mdisec from T0.Group, Tran Van Khang -
khangkito of VinCSS (member of Vingroup) working with Trend Micro's Zero Day
Initiative, and Peter Cheng from Elex Cybersecurity Inc. reported these
vulnerabilities to CISA.
- --------- EndUpdate C Part 3 of 3 ---------
5. MITIGATIONS
WECON is aware of the issue and is currently developing a solution. For more
information, contact WECON online or by phone: 0086-591-87868869-894
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Only use project files from trusted sources.
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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