CVE-2023-40033

CVE-2023-40033 · Server-Side Request Forgery via Avatar upload in flarum

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.1 · High · EPSS 0.5% · Fix available

Published

2023-08-16T20:34:11.445Z

Updated

2024-10-02T16:00:40.870Z

Stack: php

Check your server →