Informazioni sul CVE-2021-41252
Cross-site scripting (XSS) from writer field content in the site frontend
CWE ID: CWE-79
Base Score (CVSS): N/A
CVE: CVE-2021-41252
Descrizione: Kirby is an open source file structured CMS ### Impact Kirby’s writer field stores its formatted content as HTML code. Unlike with other field types, it is not possible to escape HTML special characters against cross-site scripting (XSS) attacks, otherwise the formatting would be lost. If the user is logged in to the Panel, a harmful script can for example trigger requests to Kirby’s API with the permissions of the victim. Because the writer field did not securely sanitize its contents on save, it was possible to inject malicious HTML code into the content file by sending it to Kirby’s API directly without using the Panel. This malicious HTML code would then be displayed on the site frontend and executed in the browsers of site visitors and logged in users who are browsing the site. Attackers must be in your group of authenticated Panel users in order to exploit this weakness. Users who do not make use of the writer field are not affected. This issue has been patched in Kirby 3.5.8 by sanitizing all writer field contents on the backend whenever the content is modified via Kirby’s API. Please update to this or a later version to fix the vulnerability.
Vettore di attacco CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Punteggio CVSS
Il CVSS è un sistema di valutazione che misura la gravità di una vulnerabilità informatica considerando fattori come l’impatto potenziale, la probabilità di attacco e la facilità di esecuzione.
Riassunto: Accesso: Network, Privilegi: Low, Interazione utente: Required, Confidenzialità: High, Integrità: High, Disponibilità: None.
Dettaglio del Vettore
| Metrica | Valore | Significato | Descrizione |
|---|---|---|---|
| Attack Vector (AV) | N | Network | L’attacco può essere eseguito da remoto attraverso la rete. |
| Attack Complexity (AC) | L | Low | L’attacco non richiede condizioni particolari. |
| Privileges Required (PR) | L | Low | Richiede pochi privilegi. |
| User Interaction (UI) | R | Required | È richiesta l’interazione di un utente. |
| Scope (S) | U | Unchanged | Il raggio d’azione non cambia. |
| Confidentiality Impact (C) | H | High | Grave impatto sulla riservatezza. |
| Integrity Impact (I) | H | High | Grave impatto sull’integrità. |
| Availability Impact (A) | N | None | Nessun impatto sulla disponibilità. |
Riferimenti esterni
- https://github.com/getkirby/kirby/security/advisories/GHSA-x7j7-qp7j-hw3q
- https://github.com/getkirby/kirby/commit/25fc5c6b330442e6433c99befc688f3698c5d1fc
- https://github.com/getkirby/kirby/releases/tag/3.5.8
Prodotti interessati
- getkirby – kirby
Relazioni con altri prodotti
Produttore:getkirby
Prodotto: kirby
Anno: 2021
CWE: CWE-79
CVSS: 0.0