CVE-2023-40033— Flarum 代码问题漏洞

Server-Side Request Forgery via Avatar upload in flarum

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

服务端请求伪造(SSRF)

Flarum 代码问题漏洞

Flarum是Flarum社区的一套开源的论坛系统。 Flarum 1.8.0之前版本存在代码问题漏洞，该漏洞源于允许攻击者通过 SSRF 攻击泄露服务器上的任何文件，即使在是Flarum 论坛上基本用户帐户，攻击者利用该漏洞可以通过上传包含 URL 的文件欺骗 MIME 类型，操纵应用程序执行意外的操作。

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