Headline
CVE-2022-31118
Nextcloud server is an open source personal cloud solution. In affected versions an attacker could brute force to find if federated sharing is being used and potentially try to brute force access tokens for federated shares (a-zA-Z0-9 ^ 15). It is recommended that the Nextcloud Server is upgraded to 22.2.9, 23.0.6 or 24.0.2. Users unable to upgrade may disable federated sharing via the Admin Sharing settings in index.php/settings/admin/sharing.
Impact
An attacker could brute force to find if federated sharing is being used and potentially try to brute force access tokens for federated shares (a-zA-Z0-9 ^ 15).
Patches
It is recommended that the Nextcloud Server is upgraded to 22.2.9, 23.0.6 or 24.0.2.
Workarounds
As a workaround federated sharing can be disabled in the Admin Sharing settings: index.php/settings/admin/sharing
References
- HackerOne
- PullRequest
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