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.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

CNA:  GitHub, Inc.

Base Score:  7.1 HIGH

Vector:  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score: N/A

NVD score not yet provided.

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-918	Server-Side Request Forgery (SSRF)	GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

1 change records found show changes

Initial Analysis by NIST 8/25/2023 2:10:15 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:* versions up to (excluding) 1.8.0
Added	CVSS V3.1		NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Changed	Reference Type	https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570 No Types Assigned	https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570 Patch
Changed	Reference Type	https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg No Types Assigned	https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg Vendor Advisory