CVE-2023-40033

Sažetak

Flarum is an open source forum software. Flarum is affected by a vulnerability that allows an attacker to conduct a Blind Server-Side Request Forgery (SSRF) attack or disclose any file on the server, even with a basic user account on any Flarum forum. By uploading a file containing a URL and spoofing the MIME type, an attacker can manipulate the application to execute unintended actions. The vulnerability is due to the behavior of the `intervention/image` package, which attempts to interpret the supplied file contents as a URL, which then fetches its contents. This allows an attacker to exploit the vulnerability to perform SSRF attacks, disclose local file contents, or conduct a blind oracle attack. This has been patched in Flarum version 1.8.0. Users are advised to upgrade. Users unable to upgrade may disable PHP's `allow_url_fopen` which will prevent the fetching of external files via URLs as a temporary workaround for the SSRF aspect of the vulnerability.

Reference

CVSS

Base:	7.1
Impact:	4.2
Exploitability:	2.8

Pristup

Vektor	Složenost	Autentikacija
NETWORK	LOW	-

Impact

Povjerljivost	Cjelovitost	Dostupnost
HIGH	LOW	NONE

CVSS vektor

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Zadnje važnije ažuriranje

25-08-2023 - 18:10

Objavljeno

16-08-2023 - 21:15