CVE-2020-8236 Explained : Impact and Mitigation

Nextcloud Server 19.0.1 incorrectly configures passwordless WebAuthn, leading users to believe it is a two-factor verification method.

Understanding CVE-2020-8236

This CVE involves improper authentication in Nextcloud Server 19.0.1, impacting user security.

What is CVE-2020-8236?

The misconfiguration in Nextcloud Server 19.0.1 causes confusion by not verifying the PIN for passwordless WebAuthn, misleading users about the security measures.

The Impact of CVE-2020-8236

This vulnerability can lead to a false sense of security for users, potentially exposing their accounts to unauthorized access.

Technical Details of CVE-2020-8236

Nextcloud Server 19.0.1's misconfiguration affects user authentication and security.

Vulnerability Description

The issue arises from the incorrect handling of the passwordless WebAuthn method, which fails to verify the associated PIN, compromising the authentication process.

Affected Systems and Versions

Product: Nextcloud Server
Version: 19.0.2

Exploitation Mechanism

Attackers could exploit this vulnerability by bypassing the incomplete authentication process, gaining unauthorized access to user accounts.

Mitigation and Prevention

Proactive measures are crucial to address and prevent the risks posed by CVE-2020-8236.

Immediate Steps to Take

Users should be cautious when relying on passwordless authentication methods and consider additional security measures.
Nextcloud Server administrators must update to a patched version to mitigate the vulnerability.

Long-Term Security Practices

Implement multi-factor authentication to enhance security layers.
Regularly educate users on best security practices to prevent social engineering attacks.

Patching and Updates

Nextcloud Server users should promptly update to the latest version to address the misconfiguration and enhance authentication security.