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

Quick assessment

Affected
octobercms october
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 5.2 · Medium EPSS 0.26% · P17
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I. Basic Information for CVE-2021-21264

Vulnerability Information
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Vulnerability Title
Bypass of fix for CVE-2020-26231, Twig sandbox escape
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
October CMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
octobercms october 1.0.471 -

II. Public POCs for CVE-2021-21264

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III. Intelligence Information for CVE-2021-21264

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Vendor Advisories for CVE-2021-21264 (1)

IV. Related Vulnerabilities

Same product: october
Same vendor: octobercms
Same weakness: CWE-862

V. Comments for CVE-2021-21264

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