Vulnerability CVE-2021-32726

Vulnerability Name:

CVE-2021-32726 (CCN-205236)

Assigned:

2021-07-12

Published:

2021-07-12

Updated:

2022-10-25

Summary:

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.

CVSS v3 Severity:

9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

9.1 Critical (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)
7.9 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/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): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): None

CVSS v2 Severity:

7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

9.4 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:N)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): Complete Integrity (I): Complete Availibility (A): None

Vulnerability Type:

CWE-708

Vulnerability Consequences:

Bypass Security

References:

Source: MITRE
Type: CNA
CVE-2021-32726

Source: XF
Type: UNKNOWN
nextcloud-cve202132726-sec-bypass(205236)

Source: CCN
Type: Nextcloud GIT Repository
Webauthn tokens not removed after user has been deleted

Source: CONFIRM
Type: Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg

Source: MISC
Type: Third Party Advisory
https://github.com/nextcloud/server/pull/27532

Source: MISC
Type: Permissions Required
https://hackerone.com/reports/1202590

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

Vulnerable Configuration:

Configuration 1:

cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 21.0.0 and < 21.0.3)

OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 20.0.0 and < 20.0.11)

OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version < 19.0.13)

Configuration CCN 1:

cpe:/a:nextcloud:nextcloud_server:20.0.0:-:*:*:*:*:*:*

OR cpe:/a:nextcloud:nextcloud_server:19.0.0:-:*:*:*:*:*:*

OR cpe:/a:nextcloud:nextcloud_server:21.0.0:-:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:93630	P	(Important)	2022-07-21
oval:org.opensuse.security:def:100343	P	(Important)	2021-10-26
oval:org.opensuse.security:def:110978	P	Security update for nextcloud (Important)	2021-07-20
oval:org.opensuse.security:def:11104	P	Security update for nextcloud (Important)	2021-07-20
oval:org.opensuse.security:def:103101	P	Security update for nextcloud (Important)	2021-07-20
oval:org.opensuse.security:def:111486	P	Security update for nextcloud (Important)	2021-07-20
oval:org.opensuse.security:def:109758	P	Security update for nextcloud (Important)	2021-07-20
oval:org.opensuse.security:def:96411	P	Security update for nextcloud (Important)	2021-07-20
oval:org.opensuse.security:def:35508	P	Security update for nextcloud (Important)	2021-07-20

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