CVE-2023-40033 – flarum/core

Package

Manager: composer
Name: flarum/core
Vulnerable Version: >=0 <1.8.0

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00204 pctl0.42688

Details

Flarum vulnerable to LFI and Blind SSRF via Avatar upload ## Impact The Flarum forum software is affected by a vulnerability that allows an attacker to conduct a Blind 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. ### Patches This has been patched in Flarum **v1.8**. ## Workarounds As a temporary workaround for the SSRF aspect of the vulnerability, one can disable PHP's `allow_url_fopen` which will prevent the fetching of external files via URLs. ### Credits Adam Kues - [Assetnote](https://assetnote.io/)

Metadata

Created: 2023-08-16T21:02:52Z
Modified: 2023-08-16T21:02:52Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/08/GHSA-67c6-q4j4-hccg/GHSA-67c6-q4j4-hccg.json
CWE IDs: ["CWE-918", "CWE-98"]
Alternative ID: GHSA-67c6-q4j4-hccg
Finding: F061
Auto approve: 1