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CVE-2023-40033

7.1 · HIGH

Flarum is an open source forum software.

Published Aug 16, 2023CWE-918EPSS 0.50%

Overview

CVE-2023-40033 is a high-severity vulnerability. It was published on August 16, 2023 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570GitHubgithub.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccgGitHubgithub.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570GitHubgithub.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg

How CyberStrike helps

Frequently asked questions

What is CVE-2023-40033?

CVE-2023-40033 is a high-severity vulnerability. It was published on August 16, 2023 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2023-40033?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-40033?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-40033?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-40033 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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