ICS Advisory (ICSA-20-126-01)

Fazecast jSerialComm

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1. EXECUTIVE SUMMARY

  • CVSS v3 7.8
  • ATTENTION: Low skill level to exploit
  • Vendor: Fazecast
  • Equipment: jSerialComm
  • Vulnerability: Uncontrolled Search Path Element

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an unauthenticated attacker to execute arbitrary code on a targeted system.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of jSerialComm, a platform-independent serial communication for Java, are affected:

  • Version 2.2.2 and prior

Schneider Electric reports the vulnerability affects the following EcoStruxure IT Gateway versions:

  • Versions 1.5.x, 1.6.x, 1.7.x

CISA will update this document as more mitigations are identified by affected vendors.

3.2 VULNERABILITY OVERVIEW

3.2.1    UNCONTROLLED SEARCH PATH ELEMENT CWE-427

An uncontrolled search path element vulnerability could allow a malicious DLL file with the same name of any resident DLLs inside the software installation to execute arbitrary code.

CVE-2020-10626 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:L/UI:N/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

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

3.4 RESEARCHER

Ryan Wincey (@rwincey) of Securifera working with Trend Micro’s Zero Day Initiative reported this vulnerability to CISA.

4. MITIGATIONS

Fazecast, Inc., recommends users update jSerialComm to Version 2.3 or later.

Schneider Electric recommends users upgrade EcoStruxure IT Gateway to Version 1.8.1 or later.

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 this vulnerability. This vulnerability is exploitable remotely.


Contact Information

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

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  https://www.us-cert.gov/ics 
or incident reporting:  https://www.us-cert.gov/report

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