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CVE-2021-21265— October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers

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 before version 1.1.2 存在安全漏洞，该漏洞源于当运行在配置错误的服务器上时，主机头攻击可能会成功。

CVSS 6.8 · Medium EPSS 1.75% · P77

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2021-21265

Vulnerability Information
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Vulnerability Title
October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers
Source: CVE Program / CVE List V5
Vulnerability Description
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对HTTP头部进行脚本语法转义处理不恰当
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 before version 1.1.2 存在安全漏洞，该漏洞源于当运行在配置错误的服务器上时，主机头攻击可能会成功。
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 < 1.1.2 -

II. Public POCs for CVE-2021-21265

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III. Intelligence Information for CVE-2021-21265

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Patches & Fixes for CVE-2021-21265 (2)

Vendor Advisories for CVE-2021-21265 (1)

IV. Related Vulnerabilities

Same product: october
Same vendor: octobercms
Same weakness: CWE-644

V. Comments for CVE-2021-21265

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