1. EXECUTIVE SUMMARY

  • CVSS v3 7.5
  • ATTENTION: Low skill level to exploit
  • Vendor: Horner Automation
  • Equipment: Cscape
  • Vulnerabilities: Improper Input Validation, Out-of-bounds Write

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could crash the device being accessed, which may allow the attacker to access information and execute arbitrary code.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Cscape, a control system application programming software, are affected:

  • Cscape 9.90 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1    IMPROPER INPUT VALIDATION CWE-20

An improper input validation vulnerability has been identified that may be exploited by processing files lacking user input validation. This may allow an attacker to access information and remotely execute arbitrary code.

CVE-2019-13541 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    OUT-OF-BOUNDS WRITE CWE-787

Improper validation of data may cause the system to write outside the intended buffer area, which may allow arbitrary code execution.

CVE-2019-13545 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).

3.3 BACKGROUND

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

3.4 RESEARCHER

Francis Provencher of Protek Research Lab working with Trend Micro’s Zero Day Initiative reported these vulnerabilities to CISA.

4. MITIGATIONS

Horner Automation recommends affected users update to Cscape Version 9.90 SP1 or later, which is available for download at:

www.heapg.com

www.horner-apg.com (outside of the Americas)

 

CISA recommends users take the following measures to protect themselves from 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 these vulnerabilities. These vulnerabilities are not exploitable remotely.

 

Source:

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