Vulnerability CVE-2021-32741

Vulnerability Name:

CVE-2021-32741 (CCN-205341)

Assigned:

2021-07-12

Published:

2021-07-12

Updated:

2021-07-14

Summary:

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the public share link mount endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.

CVSS v3 Severity:

5.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
4.6 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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): Low Integrity (I): None Availibility (A): None

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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): Low Integrity (I): None Availibility (A): None

CVSS v2 Severity:

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

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

5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)

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

Vulnerability Type:

CWE-Other

Vulnerability Consequences:

Obtain Information

References:

Source: MITRE
Type: CNA
CVE-2021-32741

Source: XF
Type: UNKNOWN
nextcloud-cve202132741-info-disc(205341)

Source: CCN
Type: Nextcloud GIT Repository
Lack of ratelimit on public share link mount endpoint

Source: CONFIRM
Type: Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-crvj-vmf7-xrvr

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/nextcloud/server/pull/26958

Source: MISC
Type: Permissions Required
https://hackerone.com/reports/1192144

Vulnerable Configuration:

Configuration 1:

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

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

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

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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