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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-18-277-01) - WECON PI Studio
5 October 2018
AusCERT Security Bulletin Summary
Product: WECON PI Studio
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Administrator Compromise -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
CVE Names: CVE-2018-17889 CVE-2018-14818 CVE-2018-14814
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WECON PI Studio
Original release date: October 04, 2018
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1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: WECON Technology Co., Ltd. (WECON)
o Equipment: PI Studio
o Vulnerabilities: Stack-based Buffer Overflow, Out-of-Bounds Write,
Information Exposure Through XML External Entity Reference, Out-of-Bounds
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow remote code
execution, execution of code in the context of an administrator, read past the
end of an allocated object or allow an attacker to disclose sensitive
information under the context of administrator.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of PI Studio, a HMI project programmer, are affected:
o PI Studio HMI: Versions 4.1.9 and prior,
o PI Studio Versions 4.2.34 and prior.
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
A stack-based buffer overflow vulnerability has been identified, which may
allow remote code execution.
CVE-2018-14818 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H
3.2.2 OUT-OF-BOUNDS WRITE CWE-787
The affected product parses files and passes invalidated user data to an unsafe
method call, which may allow code to be executed in the context of an
CVE-2018-14810 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:H
3.2.3 INFORMATION EXPOSURE THROUGH XML EXTERNAL ENTITY REFERENCE CWE-611
When parsing project files, the XMLParser that ships with Wecon PIStudio is
vulnerable to a XML external entity injection attack, which may allow sensitive
CVE-2018-17889 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:R/S:U/C:H/
3.2.4 OUT-OF-BOUNDS READ CWE-125
The affected product lacks proper validation of user-supplied data, which may
result in a read past the end of an allocated object.
CVE-2018-14814 has been assigned to this vulnerability. A CVSS v3 base score of
4.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: China
Mat Powell and Natnael Samson (Natti), working with Trend Micro's Zero Day
Initiative, reported these vulnerabilities to NCCIC.
WECON has verified the vulnerabilities but has not yet released an updated
version. NCCIC is currently working with WECON and will update the advisory
once an updated version is released.
NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
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
on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
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.
For any questions related to this report, please contact the NCCIC at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information:
or incident reporting:
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