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CVE-2021-43787— XSS via prototype pollution

Quick assessment

Affected
NodeBB NodeBB
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.

NodeBB是Design Create Play团队的一套使用Node.js（一套建立在Google V8 JavaScript引擎之上的网络应用平台）构建的论坛系统。 Nodebb 存在安全漏洞，该漏洞源于在受影响的版本中，uploader模块中的原型污染漏洞允许恶意用户向DOM注入任意数据(即javascript)。攻击者可利用该漏洞访问受限目录之外的位置。

CVSS 9.0 · Critical EPSS 1.32% · P70
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I. Basic Information for CVE-2021-43787

Vulnerability Information
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Vulnerability Title
XSS via prototype pollution
Source: CVE Program / CVE List V5
Vulnerability Description
Nodebb is an open source Node.js based forum software. In affected versions a prototype pollution vulnerability in the uploader module allowed a malicious user to inject arbitrary data (i.e. javascript) into the DOM, theoretically allowing for an account takeover when used in conjunction with a path traversal vulnerability disclosed at the same time as this report. The vulnerability has been patched as of v1.18.5. Users are advised to upgrade as soon as possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
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
Nodebb 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NodeBB是Design Create Play团队的一套使用Node.js（一套建立在Google V8 JavaScript引擎之上的网络应用平台）构建的论坛系统。 Nodebb 存在安全漏洞，该漏洞源于在受影响的版本中，uploader模块中的原型污染漏洞允许恶意用户向DOM注入任意数据(即javascript)。攻击者可利用该漏洞访问受限目录之外的位置。
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
NodeBB NodeBB >= 1.15.5, < 1.18.5 -

II. Public POCs for CVE-2021-43787

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III. Intelligence Information for CVE-2021-43787

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Patches & Fixes for CVE-2021-43787 (1)

Vendor Advisories for CVE-2021-43787 (1)

Security Blog Posts for CVE-2021-43787 (1)

Other References for CVE-2021-43787 (1)

Same Patch Batch · NodeBB · 2021-11-29 · 3 CVEs total

CVE-2021-43786 9.8 CRITICAL API token verification can be bypassed
CVE-2021-43788 5.0 MEDIUM Path traversal in translator module of NobeBB

IV. Related Vulnerabilities

Same product: NodeBB
Same vendor: NodeBB
Same weakness: CWE-79

V. Comments for CVE-2021-43787

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