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Vulnerability CVE-2021-41177
Published: 2021-10-25 Modified: 2021-10-26
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`. |
Type:
CWE-799
CVSS2 => (AV:N/AC:L/Au:S/C:P/I:N/A:P)
CVSS Base Score |
Impact Subscore |
Exploitability Subscore |
5.5/10 |
4.9/10 |
8/10 |
Exploit range |
Attack complexity |
Authentication |
Remote |
Low |
Single time |
Confidentiality impact |
Integrity impact |
Availability impact |
Partial |
None |
Partial |
References: |
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2
https://hackerone.com/reports/1265709
https://github.com/nextcloud/server/pull/28728
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