Improper authorization fallback allows scoped user-to-server token installation escape in GitHub Enterprise Server

An improper authorization vulnerability in scoped user-to-server (ghu_) token authorization in GitHub Enterprise Server allows an authenticated attacker to access private repositories outside the intended installation scope, which can include write operations, via an authorization fallback that treated a revoked/deleted installation as a global installation context, which could be chained with token revocation timing and SSH push attribution to obtain and reuse a victim-scoped token. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.

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通过用户控制密钥绕过授权机制

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 3.21之前版本存在安全漏洞，该漏洞源于范围用户到服务器令牌授权不当，可能导致经过身份验证的攻击者访问预期安装范围外的私有仓库，包括写入操作。

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