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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-20-353-01) Treck TCP/IP Stack
21 December 2020
AusCERT Security Bulletin Summary
Product: Treck TCP/IP stack
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2020-27338 CVE-2020-27337 CVE-2020-27336
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ICS Advisory (ICSA-20-353-01)
Treck TCP/IP Stack
Original release date: December 18, 2020
All information products included in https://us-cert.cisa.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
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information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely
o Vendor: Treck Inc.
o Equipment: TCP/IP
o Vulnerability : Heap-based Buffer Overflow, Out-of-bounds Read,
The Treck TCP/IP stack may be known by other names such as Kasago TCP/IP,
ELMIC, Net+ OS, Quadnet, GHNET v2, Kwiknet, or AMX.
2. RISK EVALUATION
Successful exploitation of this vulnerability may allow remote code execution
and a denial-of-service condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following components of Treck TCP/IP stack Version 184.108.40.206 and prior are
o HTTP Server
3.2 VULNERABILITY OVERVIEW
3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122
A vulnerability in Treck HTTP Server components allow an attacker to cause a
denial-of-service condition. This vulnerability may also result in arbitrary
CVE-2020-25066 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 OUT-OF-BOUNDS WRITE CWE-787
An out-of-bounds write in the IPv6 component may allow an unauthenticated user
to potentially cause a possible denial-of-service via network access.
CVE-2020-27337 has been assigned to this vulnerability. A CVSS v3 base score of
9.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
3.2.3 OUT-OF-BOUNDS READ CWE-125
An issue was discovered in Treck IPv6. An out-of-bound read in the DHCPv6
client component may allow an unauthenticated user to cause a possible
denial-of-service via adjacent network access.
CVE-2020-27338 has been assigned to this vulnerability. A CVSS v3 base score of
5.9 has been calculated; the CVSS vector string is ( AV:A/AC:H/PR:N/UI:N/S:U/
3.2.4 OUT-OF-BOUNDS READ CWE-125
Improper input validation in the IPv6 component may allow an unauthenticated
user to cause an out-of-bounds read of up to three bytes via network access.
CVE-2020-27336 has been assigned to this vulnerability. A CVSS v3 base score of
3.7 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Information
Technology, Healthcare and Public Health, Transportation Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
Intel reported these vulnerabilities to Treck.
Treck recommends users apply the latest version of the affected products (Treck
TCP/IP 220.127.116.11 or later versions). To obtain patches, email firstname.lastname@example.org
Treck recommends users who cannot apply the latest patches to implement
firewall rules to filter out packets that contain a negative content length in
the HTTP header.
For more detailed information on the vulnerabilities and the mitigating
controls, please see the Treck advisory .
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.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.
High skill level is needed to exploit. 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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