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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-005-03) GE Reason RT43X Clocks
6 January 2021
AusCERT Security Bulletin Summary
Product: GE Reason RT43X Clocks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2020-25197 CVE-2020-25193
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ICS Advisory (ICSA-21-005-03)
GE Reason RT43X Clocks
Original release date: January 05, 2021
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1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: GE
o Equipment: Reason RT43X Clocks
o Vulnerabilities: Code Injection, Use of Hard-coded Cryptographic Key
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an authenticated
remote attacker to execute arbitrary code on the system or intercept and
decrypt encrypted traffic.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
GE reports the vulnerabilities affect the following GNSS clocks:
o RT430, RT431 & RT434: All firmware versions prior to Version 08A06
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER CONTROL OF GENERATION OF (CODE INJECTION) CWE-94
A code injection vulnerability exists in one of the webpages that could allow
an authenticated remote attacker to execute arbitrary code on the system.
CVE-2020-25197 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/
3.2.2 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321
By having access to the hard-coded cryptographic key, attackers would be able
to intercept and decrypt encrypted traffic through an HTTPS connection.
CVE-2020-25193 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Communications, Critical Manufacturing,
Energy, Healthcare and Public Health, Transportation Systems, Water and
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
Tom Westenberg of Thales UK reported these vulnerabilities to GE.
GE strongly recommends users of Reason RT43X products update their units to
firmware Version 08A06 or greater to resolve these issues. The firmware update
addresses both vulnerabilities as described in the Reason RT43X 08A06 Release
GE recommends users evaluate current risk and implement appropriate network
security mitigation measures as follows. The following mitigation actions do
not ensure complete security but should be considered until the affected time
synchronization product is upgraded:
o Use strong network and physical security protection to prevent an attacker
from reaching the local network where Reason RT43X clocks are normally
o Block TCP/IP Ports 80 and 443 to block the HTTP/HTTPS access to web
interface with Reason RT43X products, avoiding all the vulnerabilities.
This TCP/IP port blocking should be limited to the Ethernet port interface
where the Reason RT43X clock is connected (e.g., using Access Control List
(ACL)). Otherwise, other HTTP/HTTPS applications may be affected.
o Minimize network exposure for all control system devices and/or systems and
ensure they are not accessible from the Internet.
o Analyze security events to early detect unexpected traffic/communication.
Please see GE publication GES-2020-006 (login required) for more details on
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
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
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 these vulnerabilities.
For any questions related to this report, please contact the CISA at:
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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