CVE-2021-22863 Information

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.

CVSS Vector

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

HIGH

Availability Impact

HIGH

Base Score

NONE

Base Severity

8.1