Podatność CVE-2021-41178


Publikacja: 2021-10-25   Modyfikacja: 2021-10-26

Opis:
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.

Typ:

CWE-434

(Unrestricted Upload of File with Dangerous Type)

CVSS2 => (AV:N/AC:L/Au:S/C:P/I:N/A:N)

Ogólna skala CVSS
Znaczenie
Łatwość wykorzystania
4/10
2.9/10
8/10
Wymagany dostęp
Złożoność ataku
Autoryzacja
Zdalny
Niska
Jednorazowa
Wpływ na poufność
Wpływ na integralność
Wpływ na dostępność
Częściowy
Brak
Brak
Affected software
Nextcloud -> Server 

 Referencje:
https://hackerone.com/reports/1302155
https://github.com/nextcloud/server/pull/28726
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jp9c-vpr3-m5rf

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