CVE

CVE-2021-22861

Date: (C)2021-03-03   (M)2023-12-22

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 Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:		CVSS V2 Severity:
CVSS Score : 6.5		CVSS Score : 4.0
Exploit Score: 2.8		Exploit Score: 8.0
Impact Score: 3.6		Impact Score: 2.9
CVSS V3 Metrics:		CVSS V2 Metrics:
Attack Vector: NETWORK		Access Vector: NETWORK
Attack Complexity: LOW		Access Complexity: LOW
Privileges Required: LOW		Authentication: SINGLE
User Interaction: NONE		Confidentiality: NONE
Scope: UNCHANGED		Integrity: PARTIAL
Confidentiality: NONE		Availability: NONE
Integrity: HIGH
Availability: NONE

Reference:

https://docs.github.com/en/enterprise-server%402.20/admin/release-notes#2.20.24

https://docs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.15

https://docs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.7

https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.1