Published: July 9, 2020
Security Vulnerabilities in Treck TCP/IP Software
See description for details.
See description for details.
Resolved In Version:
The Cybersecurity and Infrastructure Security Agency (CISA) issued an Industrial Control Systems (ICS) Advisory (ICSA-20-168-01) detailing 19 different vulnerabilities in the Treck TCP/IP software, which Opto 22 uses for network communication in some of its products. These vulnerabilities are referred to collectively as "Ripple20".
Opto 22 has reviewed its product set for exposure to these vulnerabilities and has determined that the following sub-set of vulnerabilities affects the listed products:
||Possible remote code execution via a single invalid DNS response.
||The following products with firmware versions R9.1a or later:
||Integer Overflow during Memory Allocation that causes an Out-of-Bounds Write
The following products with firmware versions R1.0a or later:
- SNAP-PAC-S1, SNAP-PAC-S1-FM, SNAP-PAC-S1-W
- SNAP-PAC-S2, SNAP-PAC-S2-W
- SNAP-PAC-R1, SNAP-PAC-R1-FM, SNAP-PAC-R1-W, SNAP-PAC-R1-B
- SNAP-PAC-R2, SNAP-PAC-R2-FM, SNAP-PAC-R2-W
- SNAP-PAC-EB1, SNAP-PAC-EB1-FM, SNAP-PAC-EB1-W
- SNAP-PAC-EB2, SNAP-PAC-EB2-FM, SNAP-PAC-EB2-W
||Ethernet Link Layer Integer Underflow
||Length Parameter Inconsistency in TCP
||Improper ICMPv4 Access Control
||TCP Out-of-bounds Read
||ARP Out-of-bounds Read
Opto 22 continues to study the effects of these vulnerabilities and will update this article with new information as it becomes available.
Remediation and Mitigation
Opto 22 has released a firmware update (R10.3b) that remediates these vulnerabilities for the indicated products. If you choose not to apply this firmware update, review the following cybersecurity best practices (as mentioned in the ICS-CERT advisory
- 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.
- Use an internal DNS server that performs DNS-over-HTTPS for lookups.
In addition, review the mitigation recommendations of the CERT Coordination Center (part of Carnegie Mellon University's Software Engineering Institute) in VU#257161 network mitigations
More Information About Security and Opto 22 Products
In addition to applying the fix, you can review the following series of OptoBlog postings on security, which can help you review your current practices and identify areas of improvement:
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to be notified of updates to this KB article and other information about Opto 22 products.
Opto 22 has resolved this issue.
Contact: Opto 22 Product Support.
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