CVE-2021-43856

Sažetak

Wiki.js is a wiki app built on Node.js. Wiki.js 2.5.263 and earlier is vulnerable to stored cross-site scripting through non-image file uploads for file types that can be viewed directly inline in the browser. By creating a malicious file which can execute inline JS when viewed in the browser (e.g. XML files), a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the file is viewed directly by other users. The file must be opened directly by the user and will not trigger directly in a normal Wiki.js page. A patch in version 2.5.264 fixes this vulnerability by adding an optional (enabled by default) force download flag to all non-image file types, preventing the file from being viewed inline in the browser. As a workaround, disable file upload for all non-trusted users. --- Thanks to @Haxatron for reporting this vulnerability. Initially reported via https://huntr.dev/bounties/266bff09-00d9-43ca-a4bb-bb540642811f/

Reference

CVSS

Base:	3.5
Impact:	2.9
Exploitability:	6.8

Pristup

Vektor	Složenost	Autentikacija
NETWORK	MEDIUM	SINGLE

Impact

Povjerljivost	Cjelovitost	Dostupnost
NONE	PARTIAL	NONE

CVSS vektor

AV:N/AC:M/Au:S/C:N/I:P/A:N

Zadnje važnije ažuriranje

07-01-2022 - 19:11

Objavljeno

27-12-2021 - 18:15