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AUSCERT External Security Bulletin Redistribution
ESB-2019.3346
A vulnerability has been identified in EZAutomation EZ PLC Editor
4 September 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: EZAutomation EZ PLC Editor
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-13522
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-19-246-02
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ICS Advisory (ICSA-19-246-02)
EZAutomation EZ PLC Editor
Original release date: September 03, 2019
Legal Notice
All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: EZAutomation
o Equipment: EZ PLC Editor
o Vulnerability: Improper Restriction of Operations within the Bounds of a
Memory Buffer
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to
execute code under the privileges of the application.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of EZ PLC Editor are affected:
o EZ PLC Editor Versions 1.8.41 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119
An attacker could use a specially crafted project file to corrupt the memory
and execute code under the privileges of the application.
CVE-2019-13522 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/C:H/
I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
9sg Security Team, working with Trend Micro's Zero Day Initiative, reported
this vulnerability to CISA.
4. MITIGATIONS
EZAutomation recommends users update to Version 1.9.0 or later .
EZAutomation recommends the following workarounds to further reduce risk:
o Use project files from known sources only
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
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.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-12-146-01B--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 this vulnerability. This
vulnerability is not exploitable remotely.
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