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CVE-2020-5256— Remote Code Execution Through Image Uploads in BookStack

Quick assessment

Affected
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是一套开源的使用PHP和Laravel构建wiki文档的平台。 BookStack 0.25.5之前版本中存在代码问题漏洞。攻击者可通过图像上传功能上传PHP文件利用该漏洞执行代码。

CVSS 7.9 · High EPSS 1.95% · P78
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I. Basic Information for CVE-2020-5256

Vulnerability Information
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Vulnerability Title
Remote Code Execution Through Image Uploads in BookStack
Source: CVE Program / CVE List V5
Vulnerability Description
BookStack before version 0.25.5 has a vulnerability where a user could upload PHP files through image upload functions, which would allow them to execute code on the host system remotely. They would then have the permissions of the PHP process. This most impacts scenarios where non-trusted users are given permission to upload images in any area of the application. The issue was addressed in a series of patches in versions 0.25.3, 0.25.4 and 0.25.5. Users should upgrade to at least v0.25.5 to avoid this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
动态执行代码中指令转义处理不恰当(Eval注入)
Source: CVE Program / CVE List V5
Vulnerability Title
BookStack 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BookStack是一套开源的使用PHP和Laravel构建wiki文档的平台。 BookStack 0.25.5之前版本中存在代码问题漏洞。攻击者可通过图像上传功能上传PHP文件利用该漏洞执行代码。
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 BookStack < 0.25.5 -

II. Public POCs for CVE-2020-5256

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III. Intelligence Information for CVE-2020-5256

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Vendor Advisories for CVE-2020-5256 (1)

Other References for CVE-2020-5256 (3)

IV. Related Vulnerabilities

Same product: BookStack
Same vendor: BookStackApp
Same weakness: CWE-95

V. Comments for CVE-2020-5256

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