NextcloudGHSA-2967-6MRP-GG3PRatelimiting can be bypassed using IPv6 subnets
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.005 Low
EPSS
Percentile
77.3%
Description
Impact
Nextcloud server before v19.0.11, v20.0.10 and v21.0.2 did not consider IPv6 subnets in the ratelimiting implementation. This could potentially result in an attacker bypassing ratelimit controls such as the Nextcloud bruteforce protection.
Patches
It is recommended that the Nextcloud Server is upgraded to 19.0.11, 20.0.10 or 21.0.2.
Workarounds
Disable IPv6 access to the Nextcloud instance.
References
For more information
If you have any questions or comments about this advisory:
- Create a post in nextcloud/security-advisories
- Customers: Open a support ticket at support.nextcloud.com
| CPE | Name | Operator | Version |
|---|---|---|---|
| nextcloud server | lt | 19.0.11 | |
| nextcloud server | lt | 20.0.10 | |
| nextcloud server | lt | 21.0.2 |
References
Related
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.005 Low
EPSS
Percentile
77.3%