CVE-2021-42093 : Security Advisory and Response

An issue was discovered in Zammad before 4.1.1 where an admin can execute code on the server via a crafted request that manipulates triggers.

Understanding CVE-2021-42093

What is CVE-2021-42093?

CVE-2021-42093 is a vulnerability found in Zammad before version 4.1.1, allowing an admin to run code on the server through a specially crafted request.

The Impact of CVE-2021-42093

The vulnerability enables malicious admins to execute unauthorized code on the server, potentially leading to system compromise or data breaches.

Technical Details of CVE-2021-42093

Vulnerability Description

An admin can leverage a crafted request to manipulate triggers, exploiting the system and executing arbitrary code.

Affected Systems and Versions

Affected Version: Zammad before 4.1.1

Exploitation Mechanism

By sending a carefully crafted request, an admin can abuse triggers within Zammad to execute malicious code on the server.

Mitigation and Prevention

Immediate Steps to Take

Update Zammad to version 4.1.1 or later to patch the vulnerability
Review and restrict admin privileges to minimize the risk of exploitation

Long-Term Security Practices

Regularly audit and monitor server activities for suspicious behavior
Educate admins on secure coding practices to prevent similar vulnerabilities
Implement proper input validation and secure coding techniques

Patching and Updates

Apply all relevant security updates and patches promptly to ensure that known vulnerabilities like CVE-2021-42093 are mitigated effectively.