CVE-2023-28998 Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys
A malicious server administrator can bypass end-to-end encryption to decrypt, read, and modify files in synchronized folders.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-28998?
CVE-2023-28998 is a medium-severity vulnerability in nextcloud security-advisories, published on 4 Apr 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-325
Which versions are affected by CVE-2023-28998?
It affects 1 product.
Products include Nextcloud Desktop.
How do I fix CVE-2023-28998?
Upgrade to a fixed version.
Is CVE-2023-28998 being exploited?
There is no known exploitation of CVE-2023-28998 in the wild and no public exploit code.
Other vulnerabilities in nextcloud security-advisories
- CVE-2024-46958 Misconfiguration in n/a
- CVE-2020-8224 Code injection in Desktop Client
- CVE-2020-8225 Information disclosure in Desktop Client
- CVE-2021-37617 Untrusted Search Path in Nextcloud Desktop Client
- CVE-2023-28999 Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders
Sources
Also known as DEBIAN-CVE-2023-28998, GHSA-jh3g-wpwv-cqgr, UBUNTU-CVE-2023-28998.