Tuesday, October 26, 2021

CVE-2021-41178

Description

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.

References to Advisories, Solutions, and Tools


References to Advisories, Solutions, and Tools

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Resourcehttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-jp9c-vpr3-m5rfhttps://github.com/nextcloud/server/pull/28726https://hackerone.com/reports/1302155
 

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thank you Templateism for the design - You should have written the code a little more complicated - Nothing Encrypted anymore