Flarum up to 1.7.x server-side request forgery

Summaryinfo

A vulnerability marked as critical has been reported in Flarum up to 1.7.x. Affected by this issue is some unknown functionality. Performing a manipulation results in server-side request forgery. This vulnerability is identified as CVE-2023-40033. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Flarum up to 1.7.x. It has been classified as critical. This affects an unknown code. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released 08/17/2023 as GHSA-67c6-q4j4-hccg. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2023-40033 since 08/08/2023. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.8.0 eliminates this vulnerability. Applying the patch d1059c1cc79fe61f9538f3da55e8f42abbede570 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• Flarum

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7

License

• open-source

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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