PT-2021-15272 · Nextcloud+1 · Nextcloud+1

Sjw · Published 2021-06-11 · Updated 2021-11-03 · CVE-2021-22915

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Nextcloud server versions prior to 19.0.11 Nextcloud server versions prior to 20.0.10 Nextcloud server versions prior to 21.0.2

Description The issue is related to brute force attacks due to the lack of inclusion of IPv6 subnets in rate-limiting considerations. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection.

Recommendations For versions prior to 19.0.11, update to version 19.0.11 or later. For versions prior to 20.0.10, update to version 20.0.10 or later. For versions prior to 21.0.2, update to version 21.0.2 or later.

Fix

Improper Restriction of Excessive Authentication Attempts

Weakness Enumeration

CWE-307

Related Identifiers

ALT-PU-2021-3108

ALT-PU-2021-3224

CVE-2021-22915

Affected Products

Alt Linux

Nextcloud

References · 7

• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGXGR6HYGQ6MZXISMJEHCOXRGRFRUFMA · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-22915 · Security Note
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-22915 · Vendor Advisory
• https://nextcloud.com/security/advisory/?id=NC-SA-2021-009 · Note
• https://hackerone.com/reports/1154003 · Note
• https://t.me/cibsecurity/25401 · Telegram Post