CVE-2021-42088 : Security Advisory and Response

An issue was discovered in Zammad before 4.1.1. The Chat functionality allows XSS because clipboard data is mishandled.

Understanding CVE-2021-42088

An issue in Zammad's Chat function exposing a cross-site scripting vulnerability due to mishandling clipboard data.

What is CVE-2021-42088?

This CVE identifies a vulnerability in Zammad versions before 4.1.1 that allows for cross-site scripting attacks through the mishandling of clipboard data in the Chat feature.

The Impact of CVE-2021-42088

Malicious actors can exploit this vulnerability to execute arbitrary scripts within the context of a user's session, potentially leading to unauthorized actions.

Technical Details of CVE-2021-42088

The technical details of the vulnerability in Zammad before version 4.1.1 are as follows:

Vulnerability Description

An XSS vulnerability in the Chat functionality due to improper handling of clipboard data.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: Not applicable

Exploitation Mechanism

Attackers can embed malicious scripts into the clipboard data, which then get executed in the context of a user's session through the Chat feature.

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2021-42088:

Immediate Steps to Take

Upgrade Zammad to version 4.1.1 or later to patch the vulnerability.
Ensure users are cautious with any data copied to the clipboard within the Chat feature.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Educate users on safe browsing habits and potential security risks related to cross-site scripting.

Patching and Updates

Apply security patches and updates provided by Zammad promptly to mitigate the risk of exploitation.