CVE-2021-21264— Bypass of fix for CVE-2020-26231, Twig sandbox escape

Bypass of fix for CVE-2020-26231, Twig sandbox escape

October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A bypass of CVE-2020-26231 (fixed in 1.0.470/471 and 1.1.1) was discovered that has the same impact as CVE-2020-26231 & CVE-2020-15247. An authenticated backend user with the `cms.manage_pages`, `cms.manage_layouts`, or `cms.manage_partials` permissions who would **normally** not be permitted to provide PHP code to be executed by the CMS due to `cms.enableSafeMode` being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having `cms.enableSafeMode` enabled, but would be a problem for anyone relying on `cms.enableSafeMode` to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP. Issue has been patched in Build 472 (v1.0.472) and v1.1.2. As a workaround, apply https://github.com/octobercms/october/commit/f63519ff1e8d375df30deba63156a2fc97aa9ee7 to your installation manually if unable to upgrade to Build 472 or v1.1.2.

CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

授权机制缺失

October CMS 安全漏洞

October CMS是一套基于PHP和Laravel Web应用程序框架的开源内容管理系统（CMS）。 October CMS 存在安全漏洞，该漏洞源于先前修补的漏洞＃VU48707和＃VU48710的修补程序实现不完整而存在的。具有此漏洞的远程身份验证用户允许远程用户在目标系统上执行任意PHP代码。以下产品及版本受到影响：October CMS 1.0.470, 1.0.471, 1.1.1。

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