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CVE-2021-22867— Unsafe configuration options in GitHub Pages leading to path traversal on GitHub Enterprise Server

Quick assessment

Affected
GitHub GitHub Enterprise Server
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.

GitHub Enterprise Server 是 （Github）开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server存在路径遍历漏洞，该漏洞源于网络系统或产品未能正确地过滤资源或文件路径中的特殊元素。攻击者可利用该漏洞访问受限目录之外的位置。

AI Predicted 5.3 Difficulty: Easy EPSS 1.17% · P66
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I. Basic Information for CVE-2021-22867

Vulnerability Information
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Vulnerability Title
Unsafe configuration options in GitHub Pages leading to path traversal on GitHub Enterprise Server
Source: CVE Program / CVE List V5
Vulnerability Description
A path traversal vulnerability was identified in GitHub Enterprise Server that could be exploited when building a GitHub Pages site. User-controlled configuration options used by GitHub Pages were not sufficiently restricted and made it possible to read files on the GitHub Enterprise Server instance. To exploit this vulnerability, an attacker would need permission to create and build a GitHub Pages site on the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.1.3 and was fixed in 3.1.3, 3.0.11, and 2.22.17. This vulnerability was reported via the GitHub Bug Bounty program.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Enterprise Server 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub Enterprise Server 是 （Github）开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server存在路径遍历漏洞，该漏洞源于网络系统或产品未能正确地过滤资源或文件路径中的特殊元素。攻击者可利用该漏洞访问受限目录之外的位置。
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
GitHub GitHub Enterprise Server 2.22 ~ 2.22.17 -

II. Public POCs for CVE-2021-22867

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III. Intelligence Information for CVE-2021-22867

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Other References for CVE-2021-22867 (3)

IV. Related Vulnerabilities

Same product: GitHub Enterprise Server
Same vendor: GitHub
Same weakness: CWE-77

V. Comments for CVE-2021-22867

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