What is CVE-2023-28998?

CVE-2023-28998 is a vulnerability in the Nextcloud Desktop Client that allows a malicious server administrator to gain full access to an end-to-end encrypted folder.

What is the severity of CVE-2023-28998?

The severity of CVE-2023-28998 is medium, with a severity value of 6.1.

How does CVE-2023-28998 affect Nextcloud Desktop Client?

CVE-2023-28998 affects Nextcloud Desktop Client versions 3.0.0 to 3.6.5, allowing a malicious server administrator to decrypt files, recover the folder structure, and add new files.

Is there a fix for CVE-2023-28998?

Yes, a fix for CVE-2023-28998 is available in version 3.6.5 of the Nextcloud Desktop Client.

Where can I find more information about CVE-2023-28998?

More information about CVE-2023-28998 can be found in the ETH Zurich report and the Nextcloud Desktop Client GitHub pull request and security advisories.

Vulnerability/
CVE-2023-28998

medium

6.7

CWE

325

4/4/2023

2/8/2024

CVE-2023-28998: Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys

First published: Tue Apr 04 2023(Updated: )

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, 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. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Nextcloud Desktop	>=3.0.0<3.6.5

Remedy

https://github.com/nextcloud/desktop/pull/5323

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Reference Links

Frequently Asked Questions

What is CVE-2023-28998?
CVE-2023-28998 is a vulnerability in the Nextcloud Desktop Client that allows a malicious server administrator to gain full access to an end-to-end encrypted folder.
What is the severity of CVE-2023-28998?
The severity of CVE-2023-28998 is medium, with a severity value of 6.1.
How does CVE-2023-28998 affect Nextcloud Desktop Client?
CVE-2023-28998 affects Nextcloud Desktop Client versions 3.0.0 to 3.6.5, allowing a malicious server administrator to decrypt files, recover the folder structure, and add new files.
Is there a fix for CVE-2023-28998?
Yes, a fix for CVE-2023-28998 is available in version 3.6.5 of the Nextcloud Desktop Client.
Where can I find more information about CVE-2023-28998?
More information about CVE-2023-28998 can be found in the ETH Zurich report and the Nextcloud Desktop Client GitHub pull request and security advisories.

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vendor/nextcloud
canonical/nextcloud desktop
version/nextcloud desktop/3.0.0

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