CVE-2021-22743 : Security Advisory and Response
Learn about CVE-2021-22743 affecting Triconex TCM 4351B installed on Tricon V11.3.x systems. Explore the impact, technical details, and mitigation steps to secure your systems.
A detailed overview of CVE-2021-22743, highlighting the vulnerability, impact, technical details, and mitigation steps.
Understanding CVE-2021-22743
This section delves into the vulnerability in Triconex TCM 4351B installed on Tricon V11.3.x systems.
What is CVE-2021-22743?
The CVE-2021-22743 vulnerability involves an Improper Check for Unusual or Exceptional Conditions in Triconex TCM 4351B, potentially causing module resets in specific conditions.
The Impact of CVE-2021-22743
The vulnerability could lead to module resets when malformed TriStation packets are received while the write-protect keyswitch is in the program position, posing a risk to system stability.
Technical Details of CVE-2021-22743
This section explores the specifics of the vulnerability, affected systems, and the exploitation mechanism.
Vulnerability Description
The vulnerability arises from inadequate validation of incoming packets, triggering module resets under specific circumstances.
Affected Systems and Versions
Triconex TCM 4351B installed on Tricon V11.3.x systems are susceptible to this vulnerability, potentially impacting systems with these configurations.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending malformed TriStation packets to the TCM when the write-protect keyswitch is in the program position, causing module resets.
Mitigation and Prevention
This section outlines immediate steps to take and long-term security practices to enhance system resilience.
Immediate Steps to Take
System administrators should apply patches promptly, restrict network access to vulnerable devices, and monitor for suspicious activity.
Long-Term Security Practices
Implementing network segmentation, conducting regular security assessments, and maintaining up-to-date cybersecurity protocols can help mitigate similar vulnerabilities in the future.
Patching and Updates
Regularly checking for security updates from the vendor, deploying patches as soon as they are available, and staying informed about cybersecurity best practices are essential for safeguarding against CVE-2021-22743.