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CVE-2021-22863— Improper access control in GitHub Enterprise Server leading to unauthorized changes to maintainer permissions on pull requests

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是美国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 GraphQL API 存在安全漏洞，该漏洞允许实例的经过身份验证的用户在没有适当授权的情况下修改pull请求的维护者协作权限。以下产品及版本受到影响：GitHub Enterprise Server since 2.12.22 and was fixed in versions 2.20.

AI Predicted 7.8 Difficulty: Easy EPSS 1.00% · P62
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I. Basic Information for CVE-2021-22863

Vulnerability Information
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Vulnerability Title
Improper access control in GitHub Enterprise Server leading to unauthorized changes to maintainer permissions on pull requests
Source: CVE Program / CVE List V5
Vulnerability Description
An improper access control vulnerability was identified in the GitHub Enterprise Server GraphQL API that allowed authenticated users of the instance to modify the maintainer collaboration permission of a pull request without proper authorization. By exploiting this vulnerability, an attacker would be able to gain access to head branches of pull requests opened on repositories of which they are a maintainer. Forking is disabled by default for organization owned private repositories and would prevent this vulnerability. Additionally, branch protections such as required pull request reviews or status checks would prevent unauthorized commits from being merged without further review or validation. This vulnerability affected all versions of GitHub Enterprise Server since 2.12.22 and was fixed in versions 2.20.24, 2.21.15, 2.22.7 and 3.0.1. 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
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Enterprise Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub Enterprise Server是美国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 GraphQL API 存在安全漏洞，该漏洞允许实例的经过身份验证的用户在没有适当授权的情况下修改pull请求的维护者协作权限。以下产品及版本受到影响：GitHub Enterprise Server since 2.12.22 and was fixed in versions 2.20.
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 2.20 ~ 2.20.24 -

II. Public POCs for CVE-2021-22863

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III. Intelligence Information for CVE-2021-22863

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Other References for CVE-2021-22863 (2)

Same Patch Batch · GitHub · 2021-03-03 · 4 CVEs total

CVE-2020-10519 Unsafe configuration options in GitHub Pages leading to remote code execution on GitHub En
CVE-2021-22861 Improper access control in GitHub Enterprise Server leading to unauthorized write access t
CVE-2021-22862 Improper access control in GitHub Enterprise Server leading to the disclosure of Actions s

IV. Related Vulnerabilities

Same product: GitHub Enterprise Server
Same vendor: GitHub
Same weakness: CWE-285

V. Comments for CVE-2021-22863

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