CVE-2023-25159 Nextcloud Server previews are accessible without a watermark
Attackers can access document previews without watermarks or download restrictions, bypassing intended security controls in Nextcloud Server and Office.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-25159?
CVE-2023-25159 is a low-severity missing authorization vulnerability in Nextcloud Nextcloud Server, published on 13 Feb 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform, and Nextcloud Office is a document collaboration app for the same platform. Nextcloud Server 24.0.x prior to 24.0.8 and 25.0.x prior to 25.0.1, Nextcloud Enterprise Server 24.0.x prior to 24.0.8 and 25.0.x prior to 25.0.1, and Nextcloud Office (Richdocuments) App 6.x prior to 6.3.1 and 7.x prior to 7.0.1 have previews accessible without a watermark. The download should be hidden and the watermark should get applied. This issue is fixed in Nextcloud Server 25.0.1 and 24.0.8, Nextcloud Enterprise Server 25.0.1 and 24.0.8, and Nextcloud Office (Richdocuments) App 7.0.1 (for 25) and 6.3.1 (for 24). No known workarounds are available.
Weakness: CWE-284
Which versions are affected by CVE-2023-25159?
It affects 2 products.
Products include Nextcloud Nextcloud Server, Nextcloud Richdocuments.
How do I fix CVE-2023-25159?
No fix has been published for CVE-2023-25159 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2023-25159 being exploited?
There is no known exploitation of CVE-2023-25159 in the wild and no public exploit code.
Other vulnerabilities in Nextcloud Nextcloud Server
- CVE-2021-32802 Preview generation used third-party library not suited for user-generated content in Nextcloud server
- CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server
- CVE-2018-3775 Auth bypass in Nextcloud Server
- CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected
- CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended
Sources
Also known as GHSA-92g2-h5jv-jjmg.