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CVE-2021-22862— Improper access control in GitHub Enterprise Server leading to the disclosure of Actions secrets to forks

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 存在安全漏洞，该漏洞允许绕过限制从fork发送工作流的操作秘密的限制。以下产品及版本受到影响：GitHub Enterprise Server version 3.0.0, 3.0.0.rc2, and 3.0.0.rc1。

AI Predicted 7.8 Difficulty: Easy EPSS 0.84% · P56
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I. Basic Information for CVE-2021-22862

Vulnerability Information
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Vulnerability Title
Improper access control in GitHub Enterprise Server leading to the disclosure of Actions secrets to forks
Source: CVE Program / CVE List V5
Vulnerability Description
An improper access control vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user with the ability to fork a repository to disclose Actions secrets for the parent repository of the fork. This vulnerability existed due to a flaw that allowed the base reference of a pull request to be updated to point to an arbitrary SHA or another pull request outside of the fork repository. By establishing this incorrect reference in a PR, the restrictions that limit the Actions secrets sent a workflow from forks could be bypassed. This vulnerability affected GitHub Enterprise Server version 3.0.0, 3.0.0.rc2, and 3.0.0.rc1. 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 （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 存在安全漏洞，该漏洞允许绕过限制从fork发送工作流的操作秘密的限制。以下产品及版本受到影响：GitHub Enterprise Server version 3.0.0, 3.0.0.rc2, and 3.0.0.rc1。
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 3.0 ~ 3.0.1 -

II. Public POCs for CVE-2021-22862

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III. Intelligence Information for CVE-2021-22862

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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-2021-22863 Improper access control in GitHub Enterprise Server leading to unauthorized changes to mai

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-22862

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