Vulnerability Name:

CVE-2021-32800 (CCN-208905)

Assigned:2021-09-06
Published:2021-09-06
Updated:2022-09-27
Summary:Nextcloud server is an open source, self hosted personal cloud. In affected versions an attacker is able to bypass Two Factor Authentication in Nextcloud. Thus knowledge of a password, or access to a WebAuthN trusted device of a user was sufficient to gain access to an account. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. There are no workaround for this vulnerability.
CVSS v3 Severity:8.1 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
7.1 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
8.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
7.1 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:6.4 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
8.5 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:C/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-306
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2021-32800

Source: XF
Type: UNKNOWN
nextcloud-cve202132800-sec-bypass(208905)

Source: CCN
Type: Nextcloud GIT Repository
Bypass of Two Factor Authentication

Source: CONFIRM
Type: Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gv5w-8q25-785v

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/nextcloud/server/pull/28078

Source: MISC
Type: Permissions Required, Third Party Advisory
https://hackerone.com/reports/1271052

Source: GENTOO
Type: Third Party Advisory
GLSA-202208-17

Vulnerable Configuration:Configuration 1:
  • cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 21.0.0 and < 21.0.4)
  • OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 22.0.0 and < 22.1.0)
  • OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version < 20.0.12)

    • Configuration CCN 1:
  • cpe:/a:nextcloud:nextcloud_server:20.0.0:-:*:*:*:*:*:*
  • OR cpe:/a:nextcloud:nextcloud_server:21.0.0:-:*:*:*:*:*:*
  • OR cpe:/a:nextcloud:nextcloud_server:22.0.0:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:93638
    P
    		 (Important)
    2022-03-10
    oval:org.opensuse.security:def:100351
    P
    		 (Important)
    2021-11-16
    oval:org.opensuse.security:def:11131
    P
    		Security update for nextcloud (Important)
    2021-09-16
    oval:org.opensuse.security:def:103115
    P
    		Security update for nextcloud (Important)
    2021-09-16
    oval:org.opensuse.security:def:96425
    P
    		Security update for nextcloud (Important)
    2021-09-16
    oval:org.opensuse.security:def:109772
    P
    		Security update for nextcloud (Important)
    2021-09-16
    oval:org.opensuse.security:def:111055
    P
    		Security update for nextcloud (Important)
    2021-09-14
    oval:org.opensuse.security:def:35510
    P
    		Security update for nextcloud (Important)
    2021-09-14
    oval:org.opensuse.security:def:111502
    P
    		Security update for nextcloud (Important)
    2021-09-14
    oval:org.opensuse.security:def:11129
    P
    		Security update for nextcloud (Important)
    2021-09-14
    oval:org.opensuse.security:def:11128
    P
    		Security update for nextcloud (Important)
    2021-09-13
    oval:org.opensuse.security:def:107017
    P
    		Security update for nextcloud (Important)
    2021-09-13
    BACK
    nextcloud nextcloud server *
    nextcloud nextcloud server *
    nextcloud nextcloud server *
    nextcloud nextcloud server 20.0.0
    nextcloud nextcloud server 21.0.0 -
    nextcloud nextcloud server 22.0.0 -