CVE-2021-32656
Last modified
CVE-2021-32656 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. Nextcloud Server is a Nextcloud package that handles data storage. A vulnerability in federated share exists in versions prior to 19.0.11, 20.0.10, and 21.0.2. EPSS estimates a 1.84% chance of exploitation in the next 30 days.
Description
Nextcloud Server is a Nextcloud package that handles data storage. A vulnerability in federated share exists in versions prior to 19.0.11, 20.0.10, and 21.0.2. An attacker can gain access to basic information about users of a server by accessing a public link that a legitimate server user added as a federated share. This happens because Nextcloud supports sharing registered users with other Nextcloud servers, which can be done automatically when selecting the "Add server automatically once a federated share was created successfully" setting. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2 As a workaround, disable "Add server automatically once a federated share was created successfully" in the Nextcloud settings.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Nextcloud Server | < 19.0.11 |
| Nextcloud | Nextcloud Server | >= 20.0.0, < 20.0.10 |
| Nextcloud | Nextcloud Server | >= 21.0.0, < 21.0.2 |
References
- https://hackerone.com/reports/1167853Permissions Required, Third Party Advisory
- https://security.gentoo.org/glsa/202208-17Third Party Advisory
- https://hackerone.com/reports/1167853Permissions Required, Third Party Advisory
- https://security.gentoo.org/glsa/202208-17Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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