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AUSCERT External Security Bulletin Redistribution
ESB-2021.0077
Advisory (icsa-21-007-02) Omron CX-One
8 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Omron CX-One
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27261 CVE-2020-27259 CVE-2020-27257
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-007-02
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ICS Advisory (ICSA-21-007-02)
Omron CX-One
Original release date: January 07, 2021
Legal Notice
All information products included in https://us-cert.cisa.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://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Omron
o Equipment: CX-One
o Vulnerabilities: Untrusted Pointer Dereference, Stack-based Buffer
Overflow, Type Confusion
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could crash the device being
accessed. In addition, a buffer overflow condition may allow remote code
execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of CX-One, an Automation Software Suite, are affected:
o CX-One Versions 4.60 and prior, including the following applications:
CX-Protocol Versions 2.02 and prior
CX-Server Versions 5.0.28 and prior
CX-Position Versions 2.52 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 UNTRUSTED POINTER DEREFERENCE CWE-822
The affected product may allow an attacker to supply a pointer to arbitrary
memory locations, which may allow an attacker to remotely execute arbitrary
code.
CVE-2020-27259 has been assigned to this vulnerability. A CVSS v3 base score of
6.6 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:L/I:H/A:L ).
3.2.2 STACK-BASED BUFFER OVERFLOW CWE-121
The affected product is vulnerable to a stack-based buffer overflow, which may
allow an attacker to remotely execute arbitrary code.
CVE-2020-27261 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 ).
3.2.3 ACCESS OF RESOURCE USING INCOMPATIBLE TYPE ('TYPE CONFUSION') CWE-843
This vulnerability allows local attackers to execute arbitrary code due to the
lack of proper validation of user-supplied data, which can result in a
type-confusion condition.
CVE-2020-27257 has been assigned to this vulnerability. A CVSS v3 base score of
6.6 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:L/I:H/A:L ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
rgod, working with Trend Micro's Zero Day Initiative, reported these
vulnerabilities to CISA.
4. MITIGATIONS
Omron has released an updated version of CX-One to address the reported
vulnerabilities. These releases are available through the CX-One auto-update
service and are as follows:
o CX-Protocol Version 2.03
o CX-Server Version 5.0.29
o CX-Position Version 2.53
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.cisa.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.cisa.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.
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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