CVE Vulnerability

CVE-2021-41178

Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, a file traversal vulnerability makes an attacker able to download arbitrary SVG images from the host system, including user provided files. This could also be leveraged into a XSS/phishing attack, an attacker could upload a malicious SVG file that mimics the Nextcloud login form and send a specially crafted link to victims. The XSS risk here is mitigated due to the fact that Nextcloud employs a strict Content-Security-Policy disallowing execution of arbitrary JavaScript. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.

4 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

6.5 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://hackerone.com/reports/1302155 Permissions Required
https://github.com/nextcloud/server/pull/28726 Patch Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jp9c-vpr3-m5rf Third Party Advisory
https://security.gentoo.org/glsa/202208-17 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:nextcloud:server:*:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:server:*:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:server:*:*:*:*:*:*:*:*
Information

Published : 2021-10-25 10:15

Updated : 2022-10-25 08:53

NVD link : CVE-2021-41178

Mitre link : CVE-2021-41178

Products Affected
No products.
CWE
CWE-23

Relative Path Traversal

CWE-434