CVE-2021-42750 : What You Need to Know

A cross-site scripting (XSS) vulnerability in Rule Engine in ThingsBoard 3.3.1 allows remote attackers (with administrative access) to inject arbitrary JavaScript within the title of a rule node.

Understanding CVE-2021-42750

This CVE refers to a specific XSS vulnerability that affects ThingsBoard version 3.3.1.

What is CVE-2021-42750?

CVE-2021-42750 is a cross-site scripting vulnerability in the Rule Engine component of ThingsBoard. It enables attackers with administrative access to insert malicious JavaScript code into a rule node's title.

The Impact of CVE-2021-42750

The vulnerability allows attackers to execute arbitrary JavaScript code within the context of an authenticated user, potentially leading to various security risks such as data theft, unauthorized actions, and further compromise of the system.

Technical Details of CVE-2021-42750

This section delves into the specific technical aspects of the vulnerability.

Vulnerability Description

The vulnerability resides in the Rule Engine feature of ThingsBoard 3.3.1, enabling attackers with administrative privileges to perform XSS attacks by injecting malicious JavaScript into rule node titles.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: ThingsBoard 3.3.1

Exploitation Mechanism

Attackers with administrative access can exploit this vulnerability by crafting malicious JavaScript code and inserting it into the title of a rule node in the ThingsBoard platform.

Mitigation and Prevention

Protecting systems from CVE-2021-42750 requires immediate actions to mitigate the risk and prevent future occurrences.

Immediate Steps to Take

Update ThingsBoard to a patched version that addresses the XSS vulnerability.
Restrict administrative access to trusted users only.
Monitor and review rule node titles for any suspicious JavaScript content.

Long-Term Security Practices

Regularly audit and review the security configurations of ThingsBoard.
Educate administrators on web security best practices to prevent XSS attacks.

Patching and Updates

Ensure that you regularly update ThingsBoard to the latest versions to mitigate known vulnerabilities and enhance platform security.