CVE-2024-22402 : Vulnerability Insights and Analysis

This CVE involves an improper handling of request URLs in the Nextcloud Guests app, allowing guest users to bypass the app allowlist.

Understanding CVE-2024-22402

In this section, we will delve into the details of CVE-2024-22402, covering what it is and its potential impact.

What is CVE-2024-22402?

The Nextcloud guests app is a utility designed to create guest users who can only see files shared with them. In affected versions, users were able to load the first page of apps they were not actually allowed to access. Depending on the selection of installed apps, this could result in a permissions bypass. It is recommended to upgrade the Guests app to versions 2.4.1, 2.5.1, or 3.0.1 to mitigate this vulnerability. No known workarounds are available for this issue.

The Impact of CVE-2024-22402

This vulnerability can have a medium severity impact, with a base score of 5.4 according to CVSS v3.1 metrics. The attack complexity is considered low, with network-based attack vectors. The confidentiality and integrity impacts are low, and no user interaction is required to exploit this vulnerability. However, the availability impact is determined to be none.

Technical Details of CVE-2024-22402

Here, we will explore the technical details of CVE-2024-22402, including the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in the Nextcloud Guests app allows guest users to bypass the app allowlist, potentially accessing unauthorized pages.

Affected Systems and Versions

The Nextcloud security-advisories versions affected by this issue include:

= 2.4.0, < 2.4.1

= 2.5.0, < 2.5.1

= 3.0.0, < 3.0.1

Exploitation Mechanism

Guest users within the affected versions of the Nextcloud Guests app can exploit this vulnerability by accessing the first page of apps they are not permitted to use, leading to a potential permissions bypass.

Mitigation and Prevention

In this section, we will discuss the steps to mitigate and prevent CVE-2024-22402 for enhanced security measures.

Immediate Steps to Take

To address this vulnerability, it is crucial to upgrade the Guests app to versions 2.4.1, 2.5.1, or 3.0.1 as recommended by the vendor.

Long-Term Security Practices

Implementing strong access controls, regularly updating software to the latest versions, and conducting security audits can help prevent similar vulnerabilities in the future.

Patching and Updates

Ensuring timely application of patches, security updates, and monitoring security advisories from the vendor can help maintain the security of the Nextcloud Guests app and prevent exploitation of this vulnerability.