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CVE-2020-10518— Unsafe configuration options in GitHub Pages leading to remote code execution 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是一套面向开源及私有软件项目的托管平台。Git是一套免费、开源的分布式版本控制系统。 GitHub Enterprise Server存在安全漏洞，该漏洞源于GitHub页面使用的底层解析器的用户控制配置没有足够的访问控制权限，因此可以在GitHub企业服务器实例上执行命令。具体受影响的环境如下：GitHub Enterprise Server 2.22之前版本，其中2.21.6，2.20.15和2.19.21已修复。

AI Predicted 7.8 Difficulty: Moderate EPSS 3.70% · P89

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-10518

Vulnerability Information
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Vulnerability Title
Unsafe configuration options in GitHub Pages leading to remote code execution on GitHub Enterprise Server
Source: CVE Program / CVE List V5
Vulnerability Description
A remote code execution vulnerability was identified in GitHub Enterprise Server that could be exploited when building a GitHub Pages site. User-controlled configuration of the underlying parsers used by GitHub Pages were not sufficiently restricted and made it possible to execute commands 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 2.22 and was fixed in 2.21.6, 2.20.15, and 2.19.21. The underlying issues contributing to this vulnerability were identified both internally and through the GitHub Security 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 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub是一套面向开源及私有软件项目的托管平台。Git是一套免费、开源的分布式版本控制系统。 GitHub Enterprise Server存在安全漏洞，该漏洞源于GitHub页面使用的底层解析器的用户控制配置没有足够的访问控制权限，因此可以在GitHub企业服务器实例上执行命令。具体受影响的环境如下：GitHub Enterprise Server 2.22之前版本，其中2.21.6，2.20.15和2.19.21已修复。
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 2.19 ~ 2.19.21 -

II. Public POCs for CVE-2020-10518

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III. Intelligence Information for CVE-2020-10518

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Other References for CVE-2020-10518 (3)

IV. Related Vulnerabilities

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

V. Comments for CVE-2020-10518

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