CVE-2021-22861 Information

Description

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed authenticated users of the instance to gain write access to unauthorized repositories via specifically crafted pull requests and REST API requests. An attacker would need to be able to fork the targeted repository a setting that is disabled by default for organization owned private repositories. 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 2.4.21 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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Reference

https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.15 https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1 https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.7 https://docs.github.com/en/enterprise-server@2.20/admin/release-notes#2.20.24

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

6.5