6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.3 High
AI Score
Confidence
High
0.01 Low
EPSS
Percentile
84.0%
--------- Begin Update C Part 1 of 3 ---------
--------- End Update C Part 1 of 3 ---------
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.
Successful exploitation of these vulnerabilities could allow an attacker to execute code under the privileges of the application and obtain sensitive information.
The following versions of LeviStudioU are reported to be affected:
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).
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 ---------
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).
--------- End Update C Part 2 of 3 ---------
--------- 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 Microβs Zero Day Initiative, and Peter Cheng from Elex Cybersecurity Inc. reported these vulnerabilities to CISA.
--------- End Update C Part 3 of 3 ---------
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:
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-12-146-01BβTargeted 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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-16243
www.we-con.com.cn/en/message.html
cwe.mitre.org/data/definitions/121.html
cwe.mitre.org/data/definitions/122.html
cwe.mitre.org/data/definitions/611.html
nvd.nist.gov/vuln/detail/CVE-2020-25186
nvd.nist.gov/vuln/detail/CVE-2020-25199
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=WECON%20LeviStudioU%20%28Update%20C%29+https://www.cisa.gov/news-events/ics-advisories/icsa-20-238-03
us-cert.cisa.gov/ncas/tips/ST04-014
us-cert.cisa.gov/sites/default/files/publications/emailscams_0905.pdf
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-20-238-03&title=WECON%20LeviStudioU%20%28Update%20C%29
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-20-238-03
www.oig.dhs.gov/
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-20-238-03
www.us-cert.cisa.gov/ics
www.us-cert.cisa.gov/ics
www.us-cert.gov/ics/recommended-practices
www.us-cert.gov/ics/tips/ICS-TIP-12-146-01B
www.us-cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=WECON%20LeviStudioU%20%28Update%20C%29&body=www.cisa.gov/news-events/ics-advisories/icsa-20-238-03
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.3 High
AI Score
Confidence
High
0.01 Low
EPSS
Percentile
84.0%