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AUSCERT External Security Bulletin Redistribution
ESB-2020.1621
ICS Advisory (ICSA2012601) Fazecast jSerialComm
7 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Fazecast jSerialComm
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-10626
Original Bulletin:
https://www.us-cert.gov/ics/advisories/ICSA2012601
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ICS Advisory (ICSA-20-126-01)
Fazecast jSerialComm
Original release date: May 05, 2020
Legal Notice
All information products included in https://us-cert.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 contained
within. DHS does not endorse any commercial product or service, referenced in
this product or otherwise. Further dissemination of this product is governed by
the Traffic Light Protocol (TLP) marking in the header. For more information
about TLP, see https://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Fazecast
o Equipment: jSerialComm
o 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:
o Version 2.2.2 and prior
Schneider Electric reports the vulnerability affects the following EcoStruxure
IT Gateway versions:
o 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
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Information
Technology
o COUNTRIES/AREAS DEPLOYED: Worldwide
o 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:
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.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.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
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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