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 2. News & Events
 3. Cybersecurity Advisories
 4. ICS Advisory

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ICS Advisory


ZEBRA ZTC INDUSTRIAL ZT400 AND ZTC DESKTOP GK420D

Release Date
December 05, 2023
Alert Code
ICSA-23-339-01


View CSAF(link is external)


1. EXECUTIVE SUMMARY

 * CVSS v3 5.4
 * ATTENTION: Exploitable with adjacent access/low attack complexity
 * Vendor: Zebra Technologies
 * Equipment: ZTC Industrial ZT410, ZTC Desktop GK420d
 * Vulnerability: Authentication Bypass Using an Alternate Path or Channel


2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to send
specially crafted packets to change credentials without any prior
authentication.


3. TECHNICAL DETAILS


3.1 AFFECTED PRODUCTS

The following versions of Zebra ZTC industrial and desktop printers are
affected:

 * ZTC Industrial ZT410: All versions
 * ZTC Desktop GK420d: All versions


3.2 VULNERABILITY OVERVIEW

3.2.1 Authentication Bypass Using an Alternate Path or Channel CWE-288(link is
external)

A vulnerability of authentication bypass has been found in Zebra Technologies
ZTC Industrial ZT410 and ZTC Desktop GK420d. This vulnerability allows an
attacker that is in the same network as the printer to change the username and
password for the web page by sending a specially crafted POST request to the
setvarsResults.cgi file. For this vulnerability to be exploitable, the printer's
protected mode must be disabled.

CVE-2023-4957 has been assigned to this vulnerability. A CVSS v3 base score of
5.4 has been calculated; the CVSS vector string is
(AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N(link is external)).


3.3 BACKGROUND

 * CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
 * COUNTRIES/AREAS DEPLOYED: Worldwide
 * COMPANY HEADQUARTERS LOCATION: United States


3.4 RESEARCHER

Phosphorus Cybersecurity reported this vulnerability to CISA.


4. MITIGATIONS

Zebra printers running Link-OS v6.0 and later have a protected mode that
protects the printer from this vulnerability. Activating this mode disables
unauthorized changes and locks the current configuration until an administrator
authorizes updates. By default, the secure mode is disabled as it is necessary
to generate a password first.

For more information about the protected mode and to apply it to Zebra printer
products that may be affected, see the Link-OS Printer Administration Guide(link
is external).

NOTE: The ZT410 industrial printer was discontinued on Oct 1st, 2020. The
service and support discontinuation dates are in September and December, 2025,
depending on region. Further information regarding security settings and best
practices, including "Protected Mode," can be found in the references of the
product.

NOTE: the GK420d desktop printer was discontinued on Jan 31, 2022. The service
and support discontinuation date is April 30, 2025.

For more information on the product resources, see GK420d Desktop Printer
Support Manual(link is external).

For more information on this vulnerability, see INCIBE-CERT's Security
Advisory(link is external).

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 cisa.gov/ics. Several CISA products detailing
cyber defense best practices are available for reading and download,
including Improving Industrial Control Systems Cybersecurity with
Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies
for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage at cisa.gov/ics in the technical information
paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies.

Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.

No known public exploitation specifically targeting this vulnerability has been
reported to CISA at this time.


5. UPDATE HISTORY

 * December 5, 2023: Initial Publication

This product is provided subject to this Notification and this Privacy &
Use policy.


VENDOR

Zebra


PLEASE SHARE YOUR THOUGHTS

We recently updated our anonymous product survey; we’d welcome your feedback.


RELATED ADVISORIES

Nov 30, 2023
ICS Advisory | ICSA-23-334-01


DELTA ELECTRONICS DOPSOFT

Nov 30, 2023
ICS Advisory | ICSA-23-334-04


MITSUBISHI ELECTRIC FA ENGINEERING SOFTWARE PRODUCTS

Nov 30, 2023
ICS Advisory | ICSA-23-334-02


YOKOGAWA STARDOM

Nov 30, 2023
ICS Advisory | ICSA-23-334-03


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