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AUSCERT External Security Bulletin Redistribution
Horner Automation Cscape
20 February 2019
AusCERT Security Bulletin Summary
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
CVE Names: CVE-2019-6555
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Horner Automation Cscape
Original release date: February 19, 2019
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Horner Automation
o Equipment: Cscape
o Vulnerability: Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could crash the device being
accessed, which may allow the attacker to read confidential information and
remotely execute arbitrary code.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Cscape, a control system application programming
software, are affected:
o Cscape 9.80 SP4 and prior.
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
An improper input validation vulnerability may be exploited by processing
specially crafted POC files. This may allow an attacker to read confidential
information and remotely execute arbitrary code.
CVE-2019-6555 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
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
Anonymous working with Trend Micro's Zero Day Initiative reported this
vulnerability to NCCIC.
Horner Automation recommends affected users update to the latest version of
Cscape (Version 9.90), which is available for download at the following links:
http://www.horner-apg.com (outside of the Americas)
Users with questions regarding specific Cscape installations should contact a
local Horner Automation service support team at the following email addresses
or telephone numbers:
firstname.lastname@example.org or +1-317-916-4274
email@example.com or +353-(0)21-4321266 ext. 202 (outside of the
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 this vulnerability. This
vulnerability is not exploitable remotely.
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/.
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