CVE-2021-41177
Rate-limits not working on instances without configured memory cache backend
Description
Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, Nextcloud Server did not implement a database backend for rate-limiting purposes. Any component of Nextcloud using rate-limits (as as `AnonRateThrottle` or `UserRateThrottle`) was thus not rate limited on instances not having a memory cache backend configured. In the case of a default installation, this would notably include the rate-limits on the two factor codes. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5, or 22.2.0. As a workaround, enable a memory cache backend in `config.php`.
INFO
Published Date :
Oct. 25, 2021, 10:15 p.m.
Last Modified :
Nov. 21, 2024, 6:25 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Upgrade Nextcloud to the latest version.
- Alternatively, enable a memory cache backend in `config.php`.
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-2021-41177.
| URL | Resource |
|---|---|
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2 | Third Party Advisory |
| https://github.com/nextcloud/server/pull/28728 | Patch Third Party Advisory |
| https://hackerone.com/reports/1265709 | Permissions Required Third Party Advisory |
| https://security.gentoo.org/glsa/202208-17 | Third Party Advisory |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2 | Third Party Advisory |
| https://github.com/nextcloud/server/pull/28728 | Patch Third Party Advisory |
| https://hackerone.com/reports/1265709 | Permissions Required Third Party Advisory |
| 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-2021-41177 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-2021-41177
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-2021-41177 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-41177 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-fj39-4qx4-m3f2 Added Reference https://github.com/nextcloud/server/pull/28728 Added Reference https://hackerone.com/reports/1265709 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. 26, 2022
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Changed Reference Type https://security.gentoo.org/glsa/202208-17 No Types Assigned https://security.gentoo.org/glsa/202208-17 Third Party Advisory -
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]
Oct. 28, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:N/A:P) Changed Reference Type https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2 No Types Assigned https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2 Third Party Advisory Changed Reference Type https://github.com/nextcloud/server/pull/28728 No Types Assigned https://github.com/nextcloud/server/pull/28728 Patch, Third Party Advisory Changed Reference Type https://hackerone.com/reports/1265709 No Types Assigned https://hackerone.com/reports/1265709 Permissions Required, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* versions up to (excluding) 20.0.13 *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* versions from (including) 21.0.0 up to (excluding) 21.0.5 *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* versions from (including) 22.0.0 up to (excluding) 22.2.0
Vulnerability Scoring Details
Base CVSS Score: 8.1
Base CVSS Score: 5.5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.54 }} 0.03%
score
0.66597
percentile