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.
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Wed, 02 Oct 2024 16:30:00 +0000
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published: 2023-08-16T20:34:11.445Z
Updated: 2024-10-02T16:00:40.870Z
Reserved: 2023-08-08T13:46:25.244Z
Link: CVE-2023-40033
Vulnrichment
Updated: 2024-08-02T18:24:54.634Z
NVD
Status : Modified
Published: 2023-08-16T21:15:09.987
Modified: 2024-11-21T08:18:33.877
Link: CVE-2023-40033
Redhat
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