CVE-2021-35303 : Security Advisory and Response

A detailed overview of CVE-2021-35303, a Cross Site Scripting (XSS) vulnerability found in Zammad versions 1.0.x up to 4.0.0 that allows remote attackers to execute arbitrary web scripts or HTML.

Understanding CVE-2021-35303

This section discusses what CVE-2021-35303 is and its impact on systems.

What is CVE-2021-35303?

CVE-2021-35303 is a Cross Site Scripting (XSS) vulnerability identified in Zammad 1.0.x up to 4.0.0. It enables malicious actors to run arbitrary web scripts or HTML by exploiting the User Avatar attribute.

The Impact of CVE-2021-35303

The vulnerability poses a significant risk as attackers can execute malicious scripts on affected systems, potentially leading to unauthorized data access or other security breaches.

Technical Details of CVE-2021-35303

Explore the specifics of the CVE-2021-35303 vulnerability.

Vulnerability Description

CVE-2021-35303 allows remote attackers to launch XSS attacks through Zammad's User Avatar attribute, opening the possibility for executing malicious web scripts or HTML.

Affected Systems and Versions

Zammad versions 1.0.x up to 4.0.0 are impacted by this vulnerability, exposing systems that have not implemented necessary security updates.

Exploitation Mechanism

Attackers can exploit CVE-2021-35303 by injecting malicious scripts or HTML code into the User Avatar attribute, taking advantage of the XSS weakness.

Mitigation and Prevention

Discover the steps to mitigate and prevent the exploitation of CVE-2021-35303.

Immediate Steps to Take

Users and administrators should update Zammad to a patched version to eliminate the vulnerability and prevent potential exploitation.

Long-Term Security Practices

Implement security best practices such as input validation and output encoding to mitigate XSS vulnerabilities in web applications.

Patching and Updates

Regularly check for security updates and apply patches promptly to address known vulnerabilities and enhance system security.