CVE-2021-33021 Explained : Impact and Mitigation

This article discusses the CVE-2021-33021 vulnerability in xArrow SCADA versions 7.2 and earlier, focusing on its impact, technical details, and mitigation steps.

Understanding CVE-2021-33021

This section delves into the specifics of the vulnerability, its implications, and affected systems.

What is CVE-2021-33021?

The CVE-2021-33021 vulnerability in xArrow SCADA versions 7.2 and prior exposes a cross-site scripting flaw, potentially allowing unauthorized attackers to execute arbitrary code through the 'edate' parameter of the resource xhisalarm.htm.

The Impact of CVE-2021-33021

With a CVSS base score of 6.1, this medium-severity vulnerability requires user interaction and can lead to low confidentiality and integrity impacts. Attackers could exploit this flaw to execute malicious code.

Technical Details of CVE-2021-33021

Explore the vulnerability's technical aspects, affected systems, and exploitation mechanisms.

Vulnerability Description

The vulnerability arises from inadequate input validation in the 'edate' parameter, enabling malicious code execution by threat actors.

Affected Systems and Versions

xArrow SCADA versions 7.2 and earlier are impacted by this cross-site scripting vulnerability, exposing them to potential exploitation.

Exploitation Mechanism

Attackers can leverage the 'edate' parameter in the xhisalarm.htm resource to inject and execute arbitrary code, compromising the system's security.

Mitigation and Prevention

Discover the crucial steps to mitigate the CVE-2021-33021 vulnerability and enhance the security posture of affected systems.

Immediate Steps to Take

Users are advised to disable the web server implementation, minimize network exposure for control system devices, isolate them behind firewalls, and use secure methods like VPNs for remote access.

Long-Term Security Practices

Organizations must conduct impact analysis, risk assessments, and implement stringent security measures to safeguard against potential exploits.

Patching and Updates

xArrow is urged to collaborate with CISA to address the vulnerability promptly, while users should stay updated on security patches and best practices to prevent exploitation.