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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-112-01) Horner Automation Cscape
23 April 2021
AusCERT Security Bulletin Summary
Product: Horner Automation Cscape
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Modify Arbitrary Files -- Existing Account
CVE Names: CVE-2021-22682 CVE-2021-22678
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ICS Advisory (ICSA-21-112-01)
Horner Automation Cscape
Original release date: April 22, 2021
All information products included in https://us-cert.cisa.gov/ics 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
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1. EXECUTIVE SUMMARY
o CVSS v3 8.4
o ATTENTION: Low attack complexity
o Vendor: Horner Automation
o Equipment: Cscape
o Vulnerabilities: Improper Input Validation, Improper Access Controls
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow code execution in
the context of the current process or locally escalate privileges.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Cscape, a control system application programming
software, are affected:
o Cscape: All versions prior to 9.90 SP4
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
The affected application lacks proper validation of user-supplied data when
parsing project files. This could lead to memory corruption. An attacker could
leverage this vulnerability to execute code in the context of the current
CVE-2021-22678 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/
3.2.2 IMPROPER ACCESS CONTROL CWE-284
The affected product is configured by default to be installed for all users,
which allows full permissions, including read/write access. This may allow
unprivileged users to modify the binaries and configuration files and lead to
local privilege escalation.
CVE-2021-22682 has been assigned to this vulnerability. A CVSS v3 base score of
8.4 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
Sharon Brizinov of Claroty reported these vulnerabilities to CISA.
Horner Automation recommends affected users update to the latest version of
Cscape (Version 9.90 SP4).
Users with questions regarding their specific Cscape installations should
contact their local Horner Automation service support team at either:
o email@example.com (+1-317-916-4274)
o firstname.lastname@example.org (+353-(0)21-4321266 ext. 202) outside of the
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Only use project files from trust sources.
o Ensure the least-privilege user principle is followed.
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.cisa.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.cisa.gov 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 CISA for tracking
and correlation against other incidents.
No known public exploits specifically target these vulnerabilities. These
vulnerabilities are not exploitable remotely.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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