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CVE-2020-26231— Bypass of fix for CVE-2020-15247, 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 (v1.0.470)之前版本和v1.1.1之前版本存在安全漏洞，该漏洞源于启用的enableSafeMode能够编写特定的Twig代码来逃避Twig沙箱并执行任意的PHP。

CVSS 5.2 · Medium EPSS 0.29% · P20
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I. Basic Information for CVE-2020-26231

Vulnerability Information
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Vulnerability Title
Bypass of fix for CVE-2020-15247, 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-2020-15247 (fixed in 1.0.469 and 1.1.0) was discovered that has the same impact as 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 470 (v1.0.470) and v1.1.1.
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 (v1.0.470)之前版本和v1.1.1之前版本存在安全漏洞，该漏洞源于启用的enableSafeMode能够编写特定的Twig代码来逃避Twig沙箱并执行任意的PHP。
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 = 1.0.469 -

II. Public POCs for CVE-2020-26231

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III. Intelligence Information for CVE-2020-26231

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Patches & Fixes for CVE-2020-26231 (1)

Vendor Advisories for CVE-2020-26231 (1)

Same Patch Batch · octobercms · 2020-11-23 · 5 CVEs total

CVE-2020-15246 7.5 HIGH Local File Inclusion by unauthenticated users
CVE-2020-15247 5.2 MEDIUM Twig Sandbox Escape by authenticated users with access to editing CMS templates when safem
CVE-2020-15248 4.0 MEDIUM Privilege escalation by backend users assigned to the default "Publisher" system role
CVE-2020-15249 2.8 LOW Stored XSS by authenticated backend user with access to upload files

IV. Related Vulnerabilities

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

V. Comments for CVE-2020-26231

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