Horner Automation Cscape 

1. EXECUTIVE SUMMARY

• CVSS v3 8.4
• ATTENTION: Low attack complexity
• Vendor: Horner Automation
• Equipment: Cscape
• 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:

• 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 process.

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/C:H/I:H/A:H).

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/C:H/I:H/A:H).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

Sharon Brizinov of Claroty reported these vulnerabilities to CISA.

4. MITIGATIONS

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:

• techsppt@heapg.com (+1-317-916-4274)
• tech.support@hornerirl.ie (+353-(0)21-4321266 ext. 202) outside of the Americas

CISA recommends users take the following measures to protect themselves from social engineering attacks:

• Only use project files from trust sources.
• Ensure the least-privilege user principle is followed.
• Do not click web links or open unsolicited attachments in email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• 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 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 these vulnerabilities. These vulnerabilities are not exploitable remotely.

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