CVE-2021-32726
Webauthn tokens not removed after user has been deleted
Description
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.
INFO
Published Date :
July 12, 2021, 8:15 p.m.
Last Modified :
Nov. 21, 2024, 6:07 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Upgrade Nextcloud Server to a version greater than 19.0.13, 20.0.11, or 21.0.3.
- If upgrading is not immediately possible, review and remove any orphaned WebAuthn tokens.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-32726.
| URL | Resource |
|---|---|
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg | Third Party Advisory |
| https://github.com/nextcloud/server/pull/27532 | Third Party Advisory |
| https://hackerone.com/reports/1202590 | Permissions Required |
| https://security.gentoo.org/glsa/202208-17 | Third Party Advisory |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg | Third Party Advisory |
| https://github.com/nextcloud/server/pull/27532 | Third Party Advisory |
| https://hackerone.com/reports/1202590 | Permissions Required |
| https://security.gentoo.org/glsa/202208-17 | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-32726 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-32726
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-32726 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-32726 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg Added Reference https://github.com/nextcloud/server/pull/27532 Added Reference https://hackerone.com/reports/1202590 Added Reference https://security.gentoo.org/glsa/202208-17 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Oct. 25, 2022
Action Type Old Value New Value Changed Reference Type https://security.gentoo.org/glsa/202208-17 No Types Assigned https://security.gentoo.org/glsa/202208-17 Third Party Advisory Removed CWE NIST CWE-668 Added CWE NIST CWE-287 -
CVE Modified by [email protected]
Aug. 11, 2022
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/202208-17 [No Types Assigned] -
Initial Analysis by [email protected]
Jul. 14, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg No Types Assigned https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg Third Party Advisory Changed Reference Type https://github.com/nextcloud/server/pull/27532 No Types Assigned https://github.com/nextcloud/server/pull/27532 Third Party Advisory Changed Reference Type https://hackerone.com/reports/1202590 No Types Assigned https://hackerone.com/reports/1202590 Permissions Required Added CWE NIST CWE-668 Added CPE Configuration OR *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* versions up to (excluding) 19.0.13 *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* versions from (including) 20.0.0 up to (excluding) 20.0.11 *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* versions from (including) 21.0.0 up to (excluding) 21.0.3
Vulnerability Scoring Details
Base CVSS Score: 9.8
Base CVSS Score: 7.5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.55 }} 0.06%
score
0.67038
percentile