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AUSCERT External Security Bulletin Redistribution
ESB-2020.0726
Advisory (icsa-20-056-04) Moxa EDS-G516E and EDS-510E Series
Ethernet Switches
28 February 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Moxa EDS-G516E and EDS-510E Series Ethernet Switches
Publisher: ICS
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7007 CVE-2020-7001 CVE-2020-6997
CVE-2020-6991 CVE-2020-6989 CVE-2020-6981
CVE-2020-6979
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-056-04
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ICS Advisory (ICSA-20-056-04)
Moxa EDS-G516E and EDS-510E Series Ethernet Switches
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 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Moxa
o Equipment: EDS-G516E series, and EDS-510E series
o Vulnerabilities: Stack-based Buffer Overflow, Use of a Broken or Risky
Cryptographic Algorithm, Use of Hard-coded Cryptographic Key, Use of
Hard-coded Credentials, Classic Buffer Overflow,Cleartext Transmission of
Sensitive Information, Weak Password Requirements
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could crash the device,
execute arbitrary code, and allow access to sensitive information.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Moxa reports the vulnerabilities affect the following Ethernet switches:
o EDS-G516E Series firmware, Version 5.2 or lower
o EDS-510E Series firmware, Version 5.2 or lower
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
The attacker may execute arbitrary codes or target the device, causing it to go
out of service.
CVE-2020-7007 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 ).
3.2.2 USE OF A BROKEN OR RISKY CRYPTOGRAPHIC ALGORITHM CWE-327
The affected products use a weak cryptographic algorithm, which may allow
confidential information to be disclosed.
CVE-2020-7001 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 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321
The affected products use a hard-coded cryptographic key, increasing the
possibility that confidential data can be recovered.
CVE-2020-6979 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 ).
3.2.4 USE OF HARD-CODED CREDENTIALS CWE-798
An attacker may gain access to the system without proper authentication.
CVE-2020-6981 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 ).
3.2.5 CLASSIC BUFFER OVERFLOW CWE-120
Some of the parameters in the setting pages do not ensure text is the correct
size for its buffer.
CVE-2020-6989 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
C:N/I:N/A:H ).
3.2.6 CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319
Sensitive information is transmitted over some web applications in cleartext.
CVE-2020-6997 has been assigned to this vulnerability. A CVSS v3 base score of
4.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:R/S:U/
C:H/I:N/A:N ).
3.2.7 WEAK PASSWORD REQUIREMENTS CWE-521
Weak password requirements may allow an attacker to gain access using brute
force.
CVE-2020-6991 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: 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 and Georgy Zaytsev of
Positive Technologies reported these vulnerabilities to Moxa.
4. MITIGATIONS
Moxa has developed the following solutions to address the vulnerabilities:
o EDS-G516E Series: Download the new firmware .
o EDS-510E Series: please contact Moxa Technical Support for assistance.
o Enable password on configuration file from "Configuration File Encryption"
setting to eliminate the potential risk.
o Enable HTTPS from the "Management Interface" setting.
o Enable "Account Login Failure Lockout" functions to eliminate the potential
risk.
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.
o 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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