CVEvulnerability

CVE-2021-32688

8.8 HIGH Published 2021-07-12 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-07-12
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
Weaknesses
CWE-285, CWE-552

Description

Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. These tokens are supposed to be granted to a specific applications (e.g. DAV sync clients), and can also be configured by the user to not have any filesystem access. Due to a lacking permission check, the tokens were able to change their own permissions in versions prior to 19.0.13, 20.0.11, and 21.0.3. Thus fileystem limited tokens were able to grant themselves access to the filesystem. The issue is patched in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds aside from upgrading.

Affected configurations

• nextcloud nextcloud server (< 19.0.13) • nextcloud nextcloud server (>= 20.0.0 < 20.0.11) • nextcloud nextcloud server (>= 21.0.0 < 21.0.3) • fedoraproject fedora 33 • fedoraproject fedora 34

Related

Weakness · CWE (2)

  • CWE-285 Improper Authorization weakness
  • CWE-552 Files or Directories Accessible to External Parties weakness

References