CVE-2021-39224 File path disclosure of shared files in OfficeOnline application
An attacker can view full file paths of shared documents due to verbose error messages in the Nextcloud OfficeOnline 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-2021-39224?
CVE-2021-39224 is a low-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 OfficeOnline application prior to version 1.1.1 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 OfficeOnline application is upgraded to 1.1.1. As a workaround, one may disable the OfficeOnline application in the app settings.
Weakness: CWE-200
Which versions are affected by CVE-2021-39224?
It affects 1 product.
Products include Nextcloud Officeonline.
How do I fix CVE-2021-39224?
No fix has been published for CVE-2021-39224 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-39224 being exploited?
There is no known exploitation of CVE-2021-39224 in the wild and no public exploit code.
Sources
Also known as GHSA-56wm-r6jm-3v9h.