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CVE-2021-3915— Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack

Quick assessment

Affected
bookstackapp bookstackapp/bookstack
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.

BookStack是BookStackApp（Bookstackapp）团队的一套开源的使用PHP和Laravel构建wiki文档的平台。 bookstack存在代码问题漏洞，该漏洞源于软件中的controller.php缺少对于文件类型的限制，攻击者可以上传任意类型的危险文件。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.93% · P57

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell
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I. Basic Information for CVE-2021-3915

Vulnerability Information
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Vulnerability Title
Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack
Source: CVE Program / CVE List V5
Vulnerability Description
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
Source: CVE Program / CVE List V5
CVSS Information
N/A
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
BookStack 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BookStack是BookStackApp（Bookstackapp）团队的一套开源的使用PHP和Laravel构建wiki文档的平台。 bookstack存在代码问题漏洞，该漏洞源于软件中的controller.php缺少对于文件类型的限制，攻击者可以上传任意类型的危险文件。
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
bookstackapp bookstackapp/bookstack unspecified ~ 21.10.3 -

II. Public POCs for CVE-2021-3915

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2021-3915

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Patches & Fixes for CVE-2021-3915 (1)

Vendor Advisories for CVE-2021-3915 (1)

IV. Related Vulnerabilities

Same product: bookstackapp/bookstack
Same vendor: bookstackapp
Same weakness: CWE-434

V. Comments for CVE-2021-3915

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