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CVE-2021-29475— PDF export allows arbitrary file reads

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 存在安全漏洞，攻击者可利用该漏洞能够从文件系统接收任意文件。

CVSS 10.0 · Critical EPSS 1.16% · P67
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I. Basic Information for CVE-2021-29475

Vulnerability Information
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Vulnerability Title
PDF export allows arbitrary file reads
Source: CVE Program / CVE List V5
Vulnerability Description
HedgeDoc (formerly known as CodiMD) is an open-source collaborative markdown editor. An attacker is able to receive arbitrary files from the file system when exporting a note to PDF. Since the code injection has to take place as note content, there fore this exploit requires the attackers ability to modify a note. This will affect all instances, which have pdf export enabled. This issue has been fixed by https://github.com/hedgedoc/hedgedoc/commit/c1789474020a6d668d616464cb2da5e90e123f65 and is available in version 1.5.0. Starting the CodiMD/HedgeDoc instance with `CMD_ALLOW_PDF_EXPORT=false` or set `"allowPDFExport": false` in config.json can mitigate this issue for those who cannot upgrade. This exploit works because while PhantomJS doesn't actually render the `file:///` references to the PDF file itself, it still uses them internally, and exfiltration is possible, and easy through JavaScript rendering. The impact is pretty bad, as the attacker is able to read the CodiMD/HedgeDoc `config.json` file as well any other files on the filesystem. Even though the suggested Docker deploy option doesn't have many interesting files itself, the `config.json` still often contains sensitive information, database credentials, and maybe OAuth secrets among other things.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
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 存在安全漏洞，攻击者可利用该漏洞能够从文件系统接收任意文件。
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 < 1.5.0 -

II. Public POCs for CVE-2021-29475

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III. Intelligence Information for CVE-2021-29475

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Patches & Fixes for CVE-2021-29475 (1)

Vendor Advisories for CVE-2021-29475 (1)

IV. Related Vulnerabilities

Same product: hedgedoc
Same vendor: hedgedoc
Same weakness: CWE-94

V. Comments for CVE-2021-29475

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