CVE-2022-29243 : Security Advisory and Response

Nextcloud Server versions prior to 22.2.7 and 23.0.4 are vulnerable due to missing input-size validation for new session names, impacting performance. Here's what you need to know about CVE-2022-29243.

Understanding CVE-2022-29243

This vulnerability in Nextcloud Server allows users to create app passwords with long names, leading to performance issues. The CVSS base score is 4.3 (Medium severity).

What is CVE-2022-29243?

Nextcloud Server, the file server software for Nextcloud, is susceptible to a lack of input-size validation for new session names, causing slowdowns due to loading long names in memory.

The Impact of CVE-2022-29243

The vulnerability affects systems running Nextcloud Server versions prior to 22.2.7 and 23.0.4. Attackers could exploit this issue to impact system performance and operations.

Technical Details of CVE-2022-29243

This section provides more insights into the vulnerability.

Vulnerability Description

The improper input-size validation of new session names in Nextcloud Server allows users to generate app passwords with lengthy names, hampering performance.

Affected Systems and Versions

Nextcloud versions < 22.2.7 and >= 23.0.0, < 23.0.4 are impacted by this vulnerability.

Exploitation Mechanism

The missing input-size validation enables users to create excessively long names for app passwords, which are then stored in memory, affecting system execution and responsiveness.

Mitigation and Prevention

To secure your systems against CVE-2022-29243, consider the following measures.

Immediate Steps to Take

Update Nextcloud Server to version 22.2.7 or 23.0.4 to apply the necessary fix for this vulnerability.

Long-Term Security Practices

Regularly monitor security advisories and promptly apply patches or updates to mitigate similar risks in the future.

Patching and Updates

Stay informed about security patches released by Nextcloud and apply them in a timely manner to prevent exploitation of known vulnerabilities.