CVE-2023-45149 : Exploit Details and Defense Strategies

A vulnerability has been discovered in Nextcloud talk chat module that allows attackers to brute force passwords of public conversations. Upgrading to specific versions is crucial to mitigate this issue.

Understanding CVE-2023-45149

Nextcloud talk is a chat module for the Nextcloud server platform. The vulnerability in affected versions allows bypassing brute force protection for public talk conversation passwords.

What is CVE-2023-45149?

This CVE relates to improper restriction of excessive authentication attempts in the Nextcloud Talk app. Attackers can brute force public conversation passwords due to a missing endpoint that validates such attempts.

The Impact of CVE-2023-45149

The vulnerability can lead to unauthorized access to public conversations on the Nextcloud server platform, compromising the confidentiality of discussions.

Technical Details of CVE-2023-45149

In affected versions of the Nextcloud Talk app, brute force protection for public conversation passwords is inadequate, allowing attackers to guess passwords without restriction.

Vulnerability Description

The issue arises from a missing endpoint that should validate brute force attempts for public talk conversation passwords.

Affected Systems and Versions

Versions of the Nextcloud Talk app impacted include >= 15.0.0 and < 15.0.8, >= 16.0.0 and < 16.0.6, and >= 17.0.0 and < 17.1.1.

Exploitation Mechanism

Attackers can exploit this vulnerability by attempting to brute force public conversation passwords without any restrictions, potentially gaining unauthorized access.

Mitigation and Prevention

To address CVE-2023-45149, it is crucial to take immediate action and implement long-term security measures to protect Nextcloud Talk users.

Immediate Steps to Take

Upgrade the Nextcloud Talk app to version 15.0.8, 16.0.6, or 17.1.1 as a preventive measure against brute force attacks on public conversation passwords.

Long-Term Security Practices

Implement strong password policies, educate users on secure authentication practices, and regularly update the Nextcloud Talk app to secure against future vulnerabilities.

Patching and Updates

Ensure timely installation of security patches and updates provided by Nextcloud to stay protected against known vulnerabilities.