CVE-2023-40033
Description
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.
How to fix
- flarum flarum1.8.0 or later
- flarum/core1.8.0 or later
- flarum/framework1.8.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| flarum flarum | v < 1.8.0 | 1.8.0 |
| flarum/corePackagist | v < 1.8.0 | 1.8.0 |
| flarum/frameworkPackagist | v < 1.8.0 | 1.8.0 |
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Attack Surface Management
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