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AUSCERT External Security Bulletin Redistribution
ESB-2021.0679
(icsa-21-054-02) Advantech BB-ESWGP506-2SFP-T
24 February 2021
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AusCERT Security Bulletin Summary
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Product: Advantech BB-ESWGP506-2SFP-T Switch
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2021-22667
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-054-02
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ICS Advisory (ICSA-21-054-02)
Advantech BB-ESWGP506-2SFP-T
Original release date: February 23, 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 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Advantech
o Equipment: BB-ESWGP506-2SFP-T
o Vulnerability: Use of Hard-coded Credentials
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to gain
unauthorized access to sensitive information and execute arbitrary code.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Advantech products are affected:
o BB-ESWGP506-2SFP-T industrial ethernet switches: Versions 1.01.09 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 USE OF HARD-CODED CREDENTIALS CWE-798
The affected product is vulnerable due to the use of hard-coded credentials,
which may allow an attacker to gain unauthorized access and permit the
execution of arbitrary code.
CVE-2021-22667 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: East Asia, United States, Europe
o COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
An anonymous researcher working with Trend Micro's Zero Day Initiative reported
this vulnerability to CISA.
4. MITIGATIONS
Advantech no longer sells or maintains BB-ESWGP506-2SFP-T and considers it to
be an end-of-life product.
Advantech recommends users replace the device with a succeeding model such as
EKI-7708-4FPI.
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.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 this vulnerability.
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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