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CVE-2021-43856— Stored XSS in non-image uploads in Requarks/wiki

Quick assessment

Affected
Requarks wiki
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.

Wiki.js是Requarks.io团队的一套基于Node.js并使用JavaScript语言编写的开源Wiki软件。 Requarks Wiki.js 存在跨站脚本漏洞，该漏洞源于通过创建在浏览器中查看时可以执行内联 JS 的恶意文件，恶意 Wiki.js 用户可能会进行存储的跨站点脚本攻击。这允许攻击者在其他用户直接查看文件时执行恶意 JavaScript。该文件必须由用户直接打开，不会在普通的 Wiki.js 页面中直接触发。

CVSS 8.2 · High EPSS 0.89% · P57
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I. Basic Information for CVE-2021-43856

Vulnerability Information
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Vulnerability Title
Stored XSS in non-image uploads in Requarks/wiki
Source: CVE Program / CVE List V5
Vulnerability Description
Wiki.js is a wiki app built on Node.js. Wiki.js 2.5.263 and earlier is vulnerable to stored cross-site scripting through non-image file uploads for file types that can be viewed directly inline in the browser. By creating a malicious file which can execute inline JS when viewed in the browser (e.g. XML files), a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the file is viewed directly by other users. The file must be opened directly by the user and will not trigger directly in a normal Wiki.js page. A patch in version 2.5.264 fixes this vulnerability by adding an optional (enabled by default) force download flag to all non-image file types, preventing the file from being viewed inline in the browser. As a workaround, disable file upload for all non-trusted users. --- Thanks to @Haxatron for reporting this vulnerability. Initially reported via https://huntr.dev/bounties/266bff09-00d9-43ca-a4bb-bb540642811f/
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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
Wiki.js 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wiki.js是Requarks.io团队的一套基于Node.js并使用JavaScript语言编写的开源Wiki软件。 Requarks Wiki.js 存在跨站脚本漏洞，该漏洞源于通过创建在浏览器中查看时可以执行内联 JS 的恶意文件，恶意 Wiki.js 用户可能会进行存储的跨站点脚本攻击。这允许攻击者在其他用户直接查看文件时执行恶意 JavaScript。该文件必须由用户直接打开，不会在普通的 Wiki.js 页面中直接触发。
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
Requarks wiki < 2.5.264 -

II. Public POCs for CVE-2021-43856

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III. Intelligence Information for CVE-2021-43856

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Patches & Fixes for CVE-2021-43856 (1)

Vendor Advisories for CVE-2021-43856 (1)

Other References for CVE-2021-43856 (1)

IV. Related Vulnerabilities

Same product: wiki
Same vendor: Requarks
Same weakness: CWE-79

V. Comments for CVE-2021-43856

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