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
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
EPSS
Percentile
35.9%
CVSS v3 5.9
ATTENTION: Low skill level to exploit.
Vendor: WECON Technology Co., Ltd. (WECON)
Equipment: LeviStudio HMI Editor, and PI Studio HMI Project Programmer
Vulnerabilities: Stack-based Buffer Overflow
Successful exploitation of these vulnerabilities could allow remote code execution.
The following versions of LEVI Studio HMI Editor and PI Studio HMI Project Programmer, HMI programming software products, are affected:
A buffer overflow can be triggered by opening a specially crafted file.
CVE-2018-7527 has been assigned to these vulnerabilities. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).
Sergey Zelenyuk of RVRT and Michael DePlante of Leahy Center for Digital Investigation at Champlain College, both working with Trend Microβs Zero Day Initiative, reported these vulnerabilities to NCCIC.
WECON recommends that users update to the latest version, which can be found at the following location (download):
<http://wecon-disk.oss-ap-southeast-1.aliyuncs.com/LeviStudioU20180420 TEST.exe>
NCCIC recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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 in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities. These vulnerabilities is not exploitable remotely.
wecon-disk.oss-ap-southeast-1.aliyuncs.com/LeviStudioU20180420%20TEST.exe
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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
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
EPSS
Percentile
35.9%