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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
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Access Privileged Data          -- Remote/Unauthenticated
                   Provide Misleading Information  -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-14027 CVE-2017-14021 

Original Bulletin: 

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Advisory (ICSA-17-299-01)

Korenix JetNet

Original release date: October 26, 2017

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CVSS v3 9.8

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Korenix

Equipment: JetNet

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 
man-in-the-middle attacks.


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.



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 


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

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (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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