CVE-2021-42090 : What You Need to Know

An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because deserialization is mishandled.

Understanding CVE-2021-42090

This CVE involves a vulnerability in Zammad that could potentially lead to remote code execution due to mishandled deserialization.

What is CVE-2021-42090?

CVE-2021-42090 highlights a flaw in Zammad versions preceding 4.1.1, where the Form feature is susceptible to remote code execution.

The Impact of CVE-2021-42090

The vulnerability allows threat actors to execute malicious code remotely on systems running the affected Zammad versions, potentially leading to unauthorized access and data compromise.

Technical Details of CVE-2021-42090

This section delves into the technical aspects of the CVE.

Vulnerability Description

The issue arises from the mishandling of deserialization within the Form functionality of Zammad prior to version 4.1.1.

Affected Systems and Versions

Product: Zammad
Versions affected: All versions before 4.1.1

Exploitation Mechanism

Attackers could exploit the deserialization vulnerability in the Form feature to execute arbitrary code remotely.

Mitigation and Prevention

It is crucial to take immediate action to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Update Zammad to version 4.1.1 or the latest release to mitigate the vulnerability.
Monitor system logs for any suspicious activities indicating potential exploitation.

Long-Term Security Practices

Implement secure coding practices to prevent similar vulnerabilities in the future.
Conduct regular security assessments and penetration testing to identify and remediate vulnerabilities proactively.
Stay informed about security advisories and updates from Zammad.

Patching and Updates

Ensure timely application of security patches and updates released by Zammad to protect the system against known vulnerabilities.