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CVE-2020-15249— Stored XSS by authenticated backend user with access to upload files

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 1.0.319版本和1.0.469版本存在安全漏洞，该漏洞允许具有上传文件权限的后端用户上传SVG文件，而无需对上传的文件进行任何处理。

CVSS 2.8 · Low EPSS 0.46% · P38
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I. Basic Information for CVE-2020-15249

Vulnerability Information
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Vulnerability Title
Stored XSS by authenticated backend user with access to upload files
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 CMS from version 1.0.319 and before version 1.0.469, backend users with access to upload files were permitted to upload SVG files without any sanitization applied to the uploaded files. Since SVG files support being parsed as HTML by browsers, this means that they could theoretically upload Javascript that would be executed on a path under the website's domain (i.e. /storage/app/media/evil.svg), but they would have to convince their target to visit that location directly in the target's browser as the backend does not display SVGs inline anywhere, SVGs are only displayed as image resources in the backend and are thus unable to be executed. Issue has been patched in Build 469 (v1.0.469) & v1.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
October CMS 跨站脚本漏洞
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 1.0.319版本和1.0.469版本存在安全漏洞，该漏洞允许具有上传文件权限的后端用户上传SVG文件，而无需对上传的文件进行任何处理。
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 >= 1.0.319, < 1.0.469 -

II. Public POCs for CVE-2020-15249

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III. Intelligence Information for CVE-2020-15249

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Patches & Fixes for CVE-2020-15249 (1)

Vendor Advisories for CVE-2020-15249 (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-2020-26231 5.2 MEDIUM Bypass of fix for CVE-2020-15247, Twig sandbox escape
CVE-2020-15248 4.0 MEDIUM Privilege escalation by backend users assigned to the default "Publisher" system role

IV. Related Vulnerabilities

Same product: october
Same vendor: octobercms
Same weakness: CWE-79

V. Comments for CVE-2020-15249

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