CVE-2021-41177 (GCVE-0-2021-41177)

Vulnerability from cvelistv5 – Published: 2021-10-25 21:50 – Updated: 2024-08-04 02:59
VLAI?
Title
Rate-limits not working on instances without configured memory cache backend
Summary
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`.
Severity ?
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
  • CWE-799 - Improper Control of Interaction Frequency
Assigner
References
Impacted products
Vendor Product Version
nextcloud security-advisories Affected: < 20.0.13
Affected: >= 21.0.0, < 21.0.5
Affected: < 22.2.0
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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