9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
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
0.077 Low
EPSS
Percentile
94.2%
This updated advisory is a follow-up to the original advisory titled ICSA-19-036-03 WECON LeviStudioU that was published February 5, 2019, on the ICS webpage on us-cert.gov.
Successful exploitation of these vulnerabilities could allow attackers to execute arbitrary code.
--------- Begin Update A Part 1 of 2 ---------
The following versions of LeviStudioU are affected:
--------- End Update A Part 1 of 2 ---------
Several heap-based buffer overflow vulnerabilities have been identified, which may allow arbitrary code execution.
CVE-2019-6539 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).
Multiple stack-based buffer overflow vulnerabilities may be exploited when parsing strings within project files. The process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage these vulnerabilities to execute code under the context of the current process.
CVE-2019-6537 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).
A memory corruption vulnerability has been identified, which may allow arbitrary code execution.
CVE-2019-6541 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).
Mat Powell, Ziad Badawi, and Natnael Samson working with Trend Microβs Zero Day Initiative, reported these vulnerabilities to NCCIC.
--------- Begin Update A Part 2 of 2 ---------
WECON has produced Version 1.8.69 to fix the reported vulnerabilities in Version 1.8.56; however, exploits are still successful against this updated version. Future software updates will be made available at the following location:
<http://www.we-con.com.cn/en/download_45.html>
For more information contact WECON customer service:
Phone: 0086-591-87868869-894
Website: <http://www.we-con.com.cn/en/message.html>
--------- End Update A Part 2 of 2 ---------
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA recommends users take the following measures to protect themselves from social engineering attacks:
CISA also recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.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.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-2019-6537
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6539
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6541
www.we-con.com.cn/en/download_45.html
www.we-con.com.cn/en/message.html
cwe.mitre.org/data/definitions/119.html
cwe.mitre.org/data/definitions/121.html
cwe.mitre.org/data/definitions/122.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=WECON%20LeviStudioU%20%28Update%20A%29+https://www.cisa.gov/news-events/ics-advisories/icsa-19-036-03
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-19-036-03&title=WECON%20LeviStudioU%20%28Update%20A%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:H/A:H
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-19-036-03
www.oig.dhs.gov/
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-036-03
www.us-cert.gov/
www.us-cert.gov/ics
www.us-cert.gov/ics/Recommended-Practices
www.us-cert.gov/ics/tips/ICS-TIP-12-146-01B
www.us-cert.gov/ncas/tips/ST04-014
www.us-cert.gov/sites/default/files/publications/emailscams_0905.pdf
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%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-19-036-03
9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
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
0.077 Low
EPSS
Percentile
94.2%