CVE-2023-45150 : What You Need to Know
Learn about CVE-2023-45150 affecting Nextcloud server, caused by inviting long email addresses to a calendar event, leading to unresponsive servers. Find mitigation steps here.
This article discusses the CVE-2023-45150 vulnerability in the Nextcloud server platform that arises from inviting excessively long email addresses to a calendar event, leading to server unresponsiveness.
Understanding CVE-2023-45150
This section delves into the nature and impact of the CVE-2023-45150 vulnerability in the Nextcloud server platform.
What is CVE-2023-45150?
CVE-2023-45150 is a vulnerability in the Nextcloud server due to missing precondition checks, allowing the server to attempt validating strings of any length as email addresses, causing server busyness and unresponsiveness.
The Impact of CVE-2023-45150
Inviting excessively long email addresses to a calendar event can trigger uncontrolled resource consumption, leading the Nextcloud server to become unresponsive.
Technical Details of CVE-2023-45150
This section provides specific technical details regarding the CVE-2023-45150 vulnerability.
Vulnerability Description
The Nextcloud Calendar app lacks proper precondition checks, enabling the validation of large data strings as email addresses, resulting in server overload and unresponsiveness.
Affected Systems and Versions
The vulnerability affects Nextcloud server versions greater than or equal to 1.0.0 and less than 4.4.4.
Exploitation Mechanism
By sending calendar event invitations with excessively long email addresses, attackers can exploit the server's validation process, causing resource consumption and server unresponsiveness.
Mitigation and Prevention
This section outlines the necessary steps to mitigate and prevent the CVE-2023-45150 vulnerability.
Immediate Steps to Take
Users are advised to upgrade their Nextcloud Calendar app to version 4.4.4 to address the vulnerability. Those unable to upgrade should consider disabling the calendar app as a temporary workaround.
Long-Term Security Practices
To enhance security posture, organizations should regularly update their server software and plugins to prevent vulnerabilities like CVE-2023-45150.
Patching and Updates
Stay informed about security advisories and patches released by Nextcloud to promptly address and mitigate potential vulnerabilities.