Improper access control in GitHub Enterprise Server leading to unauthorized changes to maintainer permissions on pull requests

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.

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授权机制不恰当

GitHub Enterprise Server 安全漏洞

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.

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