CVE-2021-39223 File path disclosure of shared files in Richdocuments application
An attacker can view full file paths of shared documents due to verbose error messages in the Nextcloud Richdocuments application.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-39223?
CVE-2021-39223 is a medium-severity vulnerability in nextcloud security-advisories, published on 25 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Richdocuments application prior to versions 3.8.6 and 4.2.3 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. (e.g. an attacker could see that the file `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the Richdocuments application is upgraded to 3.8.6 or 4.2.3. As a workaround, disable the Richdocuments application in the app settings.
Weakness: CWE-200
Which versions are affected by CVE-2021-39223?
It affects 1 product.
Products include Nextcloud Richdocuments.
How do I fix CVE-2021-39223?
No fix has been published for CVE-2021-39223 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-39223 being exploited?
There is no known exploitation of CVE-2021-39223 in the wild and no public exploit code.
Other vulnerabilities in nextcloud security-advisories
- CVE-2021-37628 File Drop can be bypassed using Richdocuments app in nextcloud
- CVE-2022-31024 Federated editing allows iframing remote servers by default in richdocuments
- CVE-2023-25150 Document content of files can be obtained through Collabora for files of other users
- CVE-2023-28645 Secure view can be bypassed by using internal API endpoint in Nextcloud richdocuments
- CVE-2021-37629 Lack of ratelimit on Richdocuments OCS endpoint in nextcloud
Sources
Also known as GHSA-rjcc-4cgj-6v93.