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TLP:WHITE

Advisory (ICSA-18-072-01)

Omron CX-Supervisor

Original release date: March 13, 2018

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CVSS v3 5.3

ATTENTION: Low skill level to exploit.

Vendor: Omron

Equipment: CX-Supervisor

Vulnerabilities: Stack-based Buffer Overflow, Use After Free, Access of Uninitialized Pointer, Double Free, Out-of-bounds Write, Untrusted Pointer Dereference, Heap-based Buffer Overflow

AFFECTED PRODUCTS

The following versions of CX-Supervisor are affected:

  • CX-Supervisor Versions 3.30 and prior.

IMPACT

Successful exploitation of these vulnerabilities could allow remote code execution.

MITIGATION

Omron has released a version 3.4.1 of CX-Supervisor to address the reported vulnerabilities. Users can download the latest version of CX-Supervisor at the following location:

https://www.myomron.com/index.php?action=kb&article=1707

NCCIC recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:

  • Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
  • Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
  • 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 in the NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website.

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.

In addition, NCCIC recommends that users take the following measures to protect themselves from social engineering attacks:

No known public exploits specifically target these vulnerabilities. These vulnerabilities are not exploitable remotely.

VULNERABILITY OVERVIEW

Parsing malformed project files may cause a stack-based buffer overflow.

CVE-2018-7513 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

Use after free vulnerabilities can be exploited when CX Supervisor parses a specially crafted project file.

CVE-2018-7521 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

Access of uninitialized pointer vulnerabilities can be exploited when CX Supervisor indirectly calls an initialized pointer when parsing malformed packets.

CVE-2018-7515 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

Parsing malformed project files may cause a double free vulnerability.

CVE-2018-7523 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

Parsing malformed project files may cause an out of bounds vulnerability.

CVE-2018-7517 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

Processing a malformed packet by a certain executable may cause an untrusted pointer dereference vulnerability.

CVE-2018-7525 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

Parsing malformed project files may cause a heap-based buffer overflow.

CVE-2018-7519 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

RESEARCHER

rgod working with Trend Micro’s Zero Day Initiative reported these vulnerabilities to NCCIC.

BACKGROUND

Critical Infrastructure Sector: Energy

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Japan


Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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