CVE-2020-26034 : Exploit Details and Defense Strategies

An account-enumeration issue was discovered in Zammad before 3.4.1, allowing anonymous users to guess valid email addresses.

Understanding CVE-2020-26034

This CVE identifies a security vulnerability in Zammad that could lead to account enumeration.

What is CVE-2020-26034?

The vulnerability in Zammad before version 3.4.1 allows anonymous users to exploit the Create User functionality to guess valid user email addresses.

The Impact of CVE-2020-26034

The issue enables attackers to differentiate between valid and invalid email addresses, potentially aiding in targeted attacks or information gathering.

Technical Details of CVE-2020-26034

Zammad's vulnerability details and how systems are affected.

Vulnerability Description

Zammad before 3.4.1 allows anonymous users to exploit the Create User feature, revealing valid email addresses based on application responses.

Affected Systems and Versions

Product: Zammad
Vendor: Zammad
Versions affected: All versions before 3.4.1

Exploitation Mechanism

Attackers can input email addresses and observe the application's response to determine the validity of the address.

Mitigation and Prevention

Steps to address and prevent the CVE-2020-26034 vulnerability.

Immediate Steps to Take

Upgrade Zammad to version 3.4.1 or later to mitigate the account-enumeration issue.
Implement email address confidentiality measures to prevent unauthorized access.

Long-Term Security Practices

Regularly update and patch Zammad to address security vulnerabilities promptly.
Educate users on email security best practices to prevent account enumeration attacks.

Patching and Updates

Ensure timely installation of security patches and updates for Zammad to prevent exploitation of known vulnerabilities.