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CVE-2021-29475— Hedgedoc 代码问题漏洞

一分钟漏洞结论

影响对象
hedgedoc hedgedoc
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

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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一、 漏洞 CVE-2021-29475 基础信息

漏洞信息
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Vulnerability Title
PDF export allows arbitrary file reads
来源: 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.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
来源: CVE Program / CVE List V5
Vulnerability Title
Hedgedoc 代码问题漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
hedgedoc hedgedoc < 1.5.0 -

二、漏洞 CVE-2021-29475 的公开POC

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三、漏洞 CVE-2021-29475 的情报信息

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CVE-2021-29475 补丁与修复 (1)

CVE-2021-29475 厂商安全公告 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-29475

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