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AUSCERT External Security Bulletin Redistribution
ESB-2019.2523
Advisory (icsa-19-190-03) Schneider Electric Zelio Soft 2
10 July 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric Zelio Soft 2
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6822
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-19-190-03
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ICS Advisory (ICSA-19-190-03)
Schneider Electric Zelio Soft 2
Original release date: July 09, 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: Exploitable remotely/low skill level to exploit
o Vendor: Schneider Electric
o Equipment: Zelio Soft 2
o Vulnerability: Use After Free
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow remote code execution
through the opening of a specially crafted project file.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Zelio Soft 2, a programming platform, are affected:
o Zelio Soft 2 Versions 5.2 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 USE AFTER FREE CWE-416
A use after free vulnerability has been identified, which could cause remote
code execution when opening a specially crafted Zelio Soft 2 project file.
CVE-2019-6822 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: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
3.4 RESEARCHER
9sg Security Team working with Trend Micro Zero Day Initiative (ZDI) reported
this vulnerability to NCCIC.
4. MITIGATIONS
Schneider Electric reports that version 5.3 of the affected software mitigates
the reported vulnerability. The new version can be downloaded from: https://
www.schneider-electric.com/en/download/document/ZelioSoft2_V5_3/
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
Strategies .
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 this vulnerability.
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