CVE-2023-39952 Advanced permissions not respected when copying entire group folders
Users can bypass advanced permission restrictions to read files in restricted subfolders of accessible group folders.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-39952?
CVE-2023-39952 is a medium-severity missing authorization vulnerability in Nextcloud Nextcloud Server, published on 10 Aug 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 22.0.0 and prior to versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1, a user can access files inside a subfolder of a groupfolder accessible to them, even if advanced permissions would block access to the subfolder. Nextcloud Server versions 25.0.8, 26.0.3, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1 contain a patch for this issue. No known workarounds are available.
Weakness: CWE-284
Which versions are affected by CVE-2023-39952?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2023-39952?
No fix has been published for CVE-2023-39952 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-2023-39952 being exploited?
There is no known exploitation of CVE-2023-39952 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-cq8w-v4fh-4rjq.