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Vulnerability Details CVE-2023-40033

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 42.8%
CVSS Severity
CVSS v3 Score 7.1
Products affected by CVE-2023-40033
  • Flarum » Flarum » Version: N/A
    cpe:2.3:a:flarum:flarum:-
  • Flarum » Flarum » Version: 0.1.0
    cpe:2.3:a:flarum:flarum:0.1.0
  • Flarum » Flarum » Version: 1.0.0
    cpe:2.3:a:flarum:flarum:1.0.0
  • Flarum » Flarum » Version: 1.0.1
    cpe:2.3:a:flarum:flarum:1.0.1
  • Flarum » Flarum » Version: 1.0.2
    cpe:2.3:a:flarum:flarum:1.0.2
  • Flarum » Flarum » Version: 1.0.3
    cpe:2.3:a:flarum:flarum:1.0.3
  • Flarum » Flarum » Version: 1.0.4
    cpe:2.3:a:flarum:flarum:1.0.4
  • Flarum » Flarum » Version: 1.1.0
    cpe:2.3:a:flarum:flarum:1.1.0
  • Flarum » Flarum » Version: 1.1.1
    cpe:2.3:a:flarum:flarum:1.1.1
  • Flarum » Flarum » Version: 1.2.0
    cpe:2.3:a:flarum:flarum:1.2.0
  • Flarum » Flarum » Version: 1.2.1
    cpe:2.3:a:flarum:flarum:1.2.1
  • Flarum » Flarum » Version: 1.3.0
    cpe:2.3:a:flarum:flarum:1.3.0
  • Flarum » Flarum » Version: 1.3.1
    cpe:2.3:a:flarum:flarum:1.3.1
  • Flarum » Flarum » Version: 1.4.0
    cpe:2.3:a:flarum:flarum:1.4.0
  • Flarum » Flarum » Version: 1.5.0
    cpe:2.3:a:flarum:flarum:1.5.0
  • Flarum » Flarum » Version: 1.6.0
    cpe:2.3:a:flarum:flarum:1.6.0
  • Flarum » Flarum » Version: 1.6.1
    cpe:2.3:a:flarum:flarum:1.6.1
  • Flarum » Flarum » Version: 1.6.2
    cpe:2.3:a:flarum:flarum:1.6.2
  • Flarum » Flarum » Version: 1.6.3
    cpe:2.3:a:flarum:flarum:1.6.3
  • Flarum » Flarum » Version: 1.7.0
    cpe:2.3:a:flarum:flarum:1.7.0
  • Flarum » Flarum » Version: 1.7.1
    cpe:2.3:a:flarum:flarum:1.7.1


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