CVE-2018-16463 : Security Advisory and Response

A vulnerability in Nextcloud Server versions prior to 14.0.0, 13.0.3, and 12.0.8 could lead to session fixation, potentially granting unauthorized access to protected shares.

Understanding CVE-2018-16463

This CVE identifies a security flaw in Nextcloud Server that could be exploited for unauthorized access.

What is CVE-2018-16463?

The vulnerability in Nextcloud Server versions before 14.0.0, 13.0.3, and 12.0.8 allows session fixation, enabling unauthorized individuals to gain entry to password-protected shares.

The Impact of CVE-2018-16463

The vulnerability poses a risk of unauthorized access to sensitive data stored on Nextcloud Server, potentially compromising the security and confidentiality of shared information.

Technical Details of CVE-2018-16463

This section provides technical insights into the vulnerability.

Vulnerability Description

The flaw in Nextcloud Server versions earlier than 14.0.0, 13.0.3, and 12.0.8 allows attackers to conduct session fixation attacks, potentially accessing protected shares requiring passwords.

Affected Systems and Versions

Product: Nextcloud Server
Versions Affected: <14.0.0, <13.0.3, <12.0.8

Exploitation Mechanism

Attackers can exploit this vulnerability to fixate sessions, gaining unauthorized access to protected shares on Nextcloud Server.

Mitigation and Prevention

Protecting systems from CVE-2018-16463 is crucial for maintaining security.

Immediate Steps to Take

Update Nextcloud Server to versions 14.0.0 or newer to mitigate the vulnerability.
Monitor and restrict access to sensitive shares.

Long-Term Security Practices

Implement multi-factor authentication for enhanced security.
Regularly audit and review access controls to prevent unauthorized entry.

Patching and Updates

Apply security patches promptly to ensure protection against known vulnerabilities.