CVE-2021-42085 : What You Need to Know

An issue was discovered in Zammad before 4.1.1 that allows stored XSS via a custom Avatar.

Understanding CVE-2021-42085

The vulnerability allows attackers to execute malicious scripts by manipulating the custom Avatar feature in Zammad.

What is CVE-2021-42085?

CVE-2021-42085 is a security flaw in Zammad versions prior to 4.1.1 that enables stored cross-site scripting (XSS) attacks through a custom Avatar.

The Impact of CVE-2021-42085

The vulnerability could lead to unauthorized access, data theft, and account compromise for users affected by the XSS exploit.

Technical Details of CVE-2021-42085

The following section provides specific technical details regarding this CVE.

Vulnerability Description

The issue in Zammad before version 4.1.1 allows attackers to inject and execute malicious scripts via the custom Avatar feature.

Affected Systems and Versions

Product: Zammad
Vendor: N/A
Versions affected: All versions prior to 4.1.1

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading a malicious Avatar with embedded scripts, which are then executed within the context of the user's session.

Mitigation and Prevention

Protect your systems and data from CVE-2021-42085 by following the recommended mitigation strategies.

Immediate Steps to Take

Upgrade Zammad to version 4.1.1 or the latest release to patch the XSS vulnerability.
Avoid clicking on untrusted links or uploading custom Avatars from unknown sources.

Long-Term Security Practices

Regularly monitor for suspicious activities related to Avatars or user profile images.
Educate users about the risks of XSS attacks and safe practices for managing profile images.

Patching and Updates

Stay informed about security updates and patches released by Zammad to address vulnerabilities like CVE-2021-42085.