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AUSCERT External Security Bulletin Redistribution
Multiple vulnerabilities have been identified in Korenix JetNet
27 October 2017
AusCERT Security Bulletin Summary
Product: Korenix JetNet
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2017-14027 CVE-2017-14021
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Original release date: October 26, 2017
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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 http://www.us-cert.gov/tlp/.
CVSS v3 9.8
ATTENTION: Remotely exploitable/low skill level to exploit.
Vulnerabilities: Use of Hard-coded Cryptographic Key, Use of Hard-coded
The following versions of JetNet, an Ethernet switch, are affected:
JetNet5018G version 1.4,
JetNet5310G version 1.4a,
JetNet5428G-2G-2FX version 1.4,
JetNet5628G-R version 1.4,
JetNet5628G version 1.4,
JetNet5728G-24P version 1.4,
JetNet5828G version 1.1d,
JetNet6710G-HVDC version 1.1e, and
JetNet6710G version 1.1
Successful exploitation of these vulnerabilities could allow a remote attacker
to gain remote access to the device to run arbitrary code and perform
Korenix has produced new firmware that removes the undocumented hard-coded
credentials from supported systems. The new firmware is available for download
http://www.korenix.com/upload/doc/FW_JetNet5310G_V2.0.rar (link is external)
Korenix recommends that affected users use the software support certificate
replacement feature to change certificates on affected devices.
Users can find customer support links for Korenix at:
http://www.korenix-usa.com/contact-us.php (link is external)
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. Specifically, users should:
Minimize network exposure for all control system devices and/or systems, and
ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
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.
ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended
practices on the ICS-CERT web page. 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 in the ICS-CERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321
An attacker may gain access to hard-coded certificates and private keys
allowing the attacker to perform man-in-the-middle attacks.
CVE-2017-14021 has been assigned to this vulnerability. A CVSS v3 base score
of 9.8 has been assigned; the CVSS vector string is
USE OF HARD-CODED CREDENTIALS CWE-798
The software uses undocumented hard-coded credentials that may allow an
attacker to gain remote access.
CVE-2017-14027 has been assigned to this vulnerability. A CVSS v3 base score
of 9.8 has been assigned; the CVSS vector string is
Mandar Jadhav of the Qualys Vulnerability Signature/Research Team reported
these vulnerabilities to ICS-CERT.
Critical Infrastructure Sectors: Commercial Facilities, Critical
Manufacturing, and Transportation Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Walnut, California
For any questions related to this report, please contact ICS-CERT at:
Email: firstname.lastname@example.org (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
ICS-CERT continuously strives to improve its products and services. You can
help by choosing one of the links below to provide feedback about this
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