What is CVE-2023-28999?

CVE-2023-28999 is a vulnerability that allows a malicious server administrator to gain full access to an end-to-end encrypted folder in Nextcloud Desktop client, Nextcloud Android app, and Nextcloud iOS app.

What is the severity of CVE-2023-28999?

The severity of CVE-2023-28999 is medium, with a CVSS score of 6.4.

Which software versions are affected by CVE-2023-28999?

Nextcloud Desktop client versions 3.0.0 to 3.8.0, Nextcloud Android app versions 3.13.0 to 3.25.0, and Nextcloud iOS app versions 3.0.5 to 4.8.0 are affected by CVE-2023-28999.

How can a malicious server administrator exploit CVE-2023-28999?

A malicious server administrator can exploit CVE-2023-28999 to gain full access to an end-to-end encrypted folder and decrypt files.

Are there any references for CVE-2023-28999?

Yes, you can find references for CVE-2023-28999 at the following links: [link1], [link2], [link3].

Vulnerability/
CVE-2023-28999

medium

6.9

CWE

311 325

4/4/2023

2/8/2024

CVE-2023-28999: Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders

First published: Tue Apr 04 2023(Updated: )

Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app 3.13.0 until 3.25.0, and Nextcloud iOS app 3.0.5 until 4.8.0, a malicious server administrator can gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure and add new files. This issue is fixed in Nextcloud Desktop 3.8.0, Nextcloud Android 3.25.0, and Nextcloud iOS 4.8.0. No known workarounds are available.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Nextcloud Desktop	>=3.0.0<3.8.0
Nextcloud Nextcloud	>=3.0.5<4.8.0
Nextcloud Nextcloud	>=3.13.0<3.25.0

Remedy

https://github.com/nextcloud/desktop/pull/5560

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Frequently Asked Questions

What is CVE-2023-28999?
CVE-2023-28999 is a vulnerability that allows a malicious server administrator to gain full access to an end-to-end encrypted folder in Nextcloud Desktop client, Nextcloud Android app, and Nextcloud iOS app.
What is the severity of CVE-2023-28999?
The severity of CVE-2023-28999 is medium, with a CVSS score of 6.4.
Which software versions are affected by CVE-2023-28999?
Nextcloud Desktop client versions 3.0.0 to 3.8.0, Nextcloud Android app versions 3.13.0 to 3.25.0, and Nextcloud iOS app versions 3.0.5 to 4.8.0 are affected by CVE-2023-28999.
How can a malicious server administrator exploit CVE-2023-28999?
A malicious server administrator can exploit CVE-2023-28999 to gain full access to an end-to-end encrypted folder and decrypt files.
Are there any references for CVE-2023-28999?
Yes, you can find references for CVE-2023-28999 at the following links: [link1], [link2], [link3].

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