CVE-2021-20592 : Vulnerability Insights and Analysis
Learn about CVE-2021-20592, a critical vulnerability in GOT2000 series models and GT SoftGOT2000, enabling remote DoS attacks via the MODBUS/TCP slave communication function.
A missing synchronization vulnerability in the GOT2000 series GT27, GT25, and GT23 models, along with GT SoftGOT2000 versions 1.170C through 1.256S, allows a remote attacker to cause a Denial of Service (DoS) condition by exploiting the MODBUS/TCP slave communication function.
Understanding CVE-2021-20592
This section explores the details of the vulnerability, its impact, technical aspects, and mitigation strategies.
What is CVE-2021-20592?
The flaw enables an unauthenticated attacker to disrupt the MODBUS/TCP slave communication by rapidly connecting and disconnecting to the communication port, necessitating a restart to remediate.
The Impact of CVE-2021-20592
The vulnerability allows for DoS attacks, affecting the availability of the affected products and potentially disrupting critical operations dependent on MODBUS/TCP communication.
Technical Details of CVE-2021-20592
Let's delve into the technical aspects of the vulnerability.
Vulnerability Description
The missing synchronization vulnerability impacts the communication driver versions of the specified models, leading to service disruption on the MODBUS/TCP slave function.
Affected Systems and Versions
GOT2000 series GT27, GT25, and GT23 models, as well as GT SoftGOT2000 versions 1.170C through 1.256S are affected by this vulnerability.
Exploitation Mechanism
Exploitation involves a remote, unauthenticated attacker repeatedly connecting and disconnecting to the MODBUS/TCP communication port, triggering a DoS state that requires a restart for recovery.
Mitigation and Prevention
This section covers the steps to mitigate and prevent exploitation of CVE-2021-20592.
Immediate Steps to Take
Implement network security controls, restrict access to vulnerable ports, and apply vendor-supplied patches to safeguard against potential attacks.
Long-Term Security Practices
Regularly update software and firmware, conduct security assessments, and educate personnel on best security practices to enhance overall resilience against cyber threats.
Patching and Updates
Stay informed about security advisories from the vendor, promptly apply patches, and follow best practices for maintaining secure industrial control systems.