Headline
CVE-2021-41239: User enumeration setting not obeyed in User Status API
Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.
Package
Server (Nextcloud)
Affected versions
< 20.0.14, < 21.0.6 , < 22.2.1
Patched versions
20.0.14, 21.0.6 , 22.2.1
Description
Impact
The User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled.
Patches
It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1.
Workarounds
None.
References
- Bug Report
- Pull Request
For more information
If you have any questions or comments about this advisory:
- Create a post in nextcloud/security-advisories
- Customers: Open a support ticket at support.nextcloud.com
Related news
Gentoo Linux Security Advisory 202208-17 - Multiple vulnerabilities have been found in Nextcloud, the worst of which could result in denial of service. Versions less than 23.0.4 are affected.