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CVE-2020-26286— Arbitary file upload

Quick assessment

Affected
hedgedoc hedgedoc
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.

Hedgedoc是Hedgedoc团队的一个基于Javascript的Markdown文档实时编辑分享平台。 HedgeDoc 1.7.1之前版本存在安全漏洞，未经认证的攻击者可利用该漏洞可以上传任意文件到上传存储后端，包括HTML、JS和PHP文件。

CVSS 7.5 · High EPSS 1.42% · P71

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell
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I. Basic Information for CVE-2020-26286

Vulnerability Information
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Vulnerability Title
Arbitary file upload
Source: CVE Program / CVE List V5
Vulnerability Description
HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an unauthenticated attacker can upload arbitrary files to the upload storage backend including HTML, JS and PHP files. The problem is patched in HedgeDoc 1.7.1. You should however verify that your uploaded file storage only contains files that are allowed, as uploaded files might still be served. As workaround it's possible to block the `/uploadimage` endpoint on your instance using your reverse proxy. And/or restrict MIME-types and file names served from your upload file storage.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
Hedgedoc 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hedgedoc是Hedgedoc团队的一个基于Javascript的Markdown文档实时编辑分享平台。 HedgeDoc 1.7.1之前版本存在安全漏洞，未经认证的攻击者可利用该漏洞可以上传任意文件到上传存储后端，包括HTML、JS和PHP文件。
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
hedgedoc hedgedoc < 1.7.1 -

II. Public POCs for CVE-2020-26286

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III. Intelligence Information for CVE-2020-26286

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Patches & Fixes for CVE-2020-26286 (1)

Vendor Advisories for CVE-2020-26286 (1)

Other References for CVE-2020-26286 (1)

IV. Related Vulnerabilities

Same product: hedgedoc
Same vendor: hedgedoc
Same weakness: CWE-434

V. Comments for CVE-2020-26286

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