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AUSCERT External Security Bulletin Redistribution
ESB-2020.0721
Advisory (icsa-20-056-02) Moxa ioLogik 2542-HSPA Series
Controllers and IOs, and IOxpress Configuration Utility
28 February 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: ioLogik 2500 series firmware
IOxpress configuration utility
Publisher: ICS
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7003 CVE-2019-18242 CVE-2019-18238
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-056-02
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ICS Advisory (ICSA-20-056-02)
Moxa ioLogik 2542-HSPA Series Controllers and IOs, and IOxpress Configuration
Utility
Original release date: February 25, 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 7.5
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Moxa
o Equipment: ioLogik 2542-HSPA Series Controllers and IOs, and IOxpress
Configuration Utility
o Vulnerabilities: Cleartext Storage of Sensitive Information, Cleartext
Transmission of Sensitive Information, Incorrectly Specified Destination in
a Communication Channel
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could crash the device or
allow access to sensitive information.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Moxa reports these vulnerabilities affects the following products:
o ioLogik 2500 series firmware, Version 3.0 or lower
o IOxpress configuration utility, Version 2.3.0 or lower
3.2 VULNERABILITY OVERVIEW
3.2.1 CLEARTEXT STORAGE OF SENSITIVE INFORMATION CWE-312
Sensitive information is stored in configuration files without encryption,
which may allow an attacker to access an administrative account.
CVE-2019-18238 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:N/A:N ).
3.2.2 CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319
Sensitive information is transmitted over some web applications in clear text.
CVE-2020-7003 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:N/A:N ).
3.2.3 INCORRECTLY SPECIFIED DESTINATION IN A COMMUNICATION CHANNEL CWE-941
Frequent and multiple requests for short-term use may cause the web server to
fail.
CVE-2019-18242 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:L ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
Ilya Karpov and Evgeniy Druzhinin from Rostelecom-Solar reported these
vulnerabilities to Moxa.
4. MITIGATIONS
Moxa has developed a solution to address these vulnerabilities: Please contact
Moxa Technical Support for a security patch.
Please see Moxa's security advisory for more information.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o 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.
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.
CISA also 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.
Refer to Avoiding Social Engineering and Phishing Attacks for more information
on social engineering attacks.
No known public exploits specifically target these vulnerabilities.
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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