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`.

Category

8.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.18%
Vendor Advisory gentoo.org
Affected: nextcloud security-advisories
Published at:
Updated at:

References

Link Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2 third party advisory
https://github.com/nextcloud/server/pull/28728 third party advisory patch
https://hackerone.com/reports/1265709 third party advisory permissions required
https://security.gentoo.org/glsa/202208-17 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-41177?
CVE-2021-41177 has been scored as a high severity vulnerability.
How to fix CVE-2021-41177?
To fix CVE-2021-41177, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-41177 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-41177 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-41177?
CVE-2021-41177 affects nextcloud security-advisories.
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