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.

CVSS v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570	Patch
https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2023-08-16 21:15

Updated : 2023-08-25 18:10

NVD link : CVE-2023-40033

Mitre link : CVE-2023-40033

CVE.ORG link : CVE-2023-40033

JSON object : View

Products Affected

flarum

flarum

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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