Vulnerability CVE-2020-8294

Vulnerability Name:

CVE-2020-8294 (CCN-196144)

Assigned:

2020-11-18

Published:

2020-11-18

Updated:

2021-02-05

Summary:

A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.

CVSS v3 Severity:

5.4 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)
5.2 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:H/RL:O/RC:C)

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

3.0 Low (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N)
2.9 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N/E:H/RL:O/RC:C)

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

CVSS v2 Severity:

3.5 Low (CVSS v2 Vector: AV:N/AC:M/Au:S/C:N/I:P/A:N)

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

2.1 Low (CCN CVSS v2 Vector: AV:N/AC:H/Au:S/C:N/I:P/A:N)

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

Vulnerability Type:

CWE-79

Vulnerability Consequences:

Cross-Site Scripting

References:

Source: MITRE
Type: CNA
CVE-2020-8294

Source: XF
Type: UNKNOWN
nextcloud-cve20208294-xss(196144)

Source: CONFIRM
Type: Permissions Required, Third Party Advisory
https://hackerone.com/reports/1023787

Source: CCN
Type: NC-SA-2021-002
Stored XSS in markdown file with Nextcloud Talk using Internet Explorer

Source: CONFIRM
Type: Vendor Advisory
https://nextcloud.com/security/advisory/?id=NC-SA-2021-002

Vulnerable Configuration:

Configuration 1:

cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version < 18.0.11)

OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 19.0.0 and < 19.0.5)

OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 20.0.0 and < 20.0.2)

Configuration CCN 1:

cpe:/a:nextcloud:nextcloud_server:18.0.0:-:*:*:*:*:*:*

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

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

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:103101	P	Security update for nextcloud (Important)	2021-07-20
oval:org.opensuse.security:def:35508	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:111486	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:109758	P	Security update for nextcloud (Important)	2021-07-20
oval:org.opensuse.security:def:11176	P	Security update for nextcloud (Moderate)	2021-02-11
oval:org.opensuse.security:def:109792	P	Security update for nextcloud (Moderate)	2021-02-11
oval:org.opensuse.security:def:103135	P	Security update for nextcloud (Moderate)	2021-02-11
oval:org.opensuse.security:def:96445	P	Security update for nextcloud (Moderate)	2021-02-11
oval:org.opensuse.security:def:111211	P	Security update for nextcloud (Moderate)	2021-02-08

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