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CVE-2021-22861

6.5 · MEDIUM

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 specifical…

Published Mar 3, 2021CWE-285EPSS 0.95%

Overview

CVE-2021-22861 is a medium-severity vulnerability. It was published on March 3, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubdocs.github.com/en/enterprise-server%402.20/admin/release-notes#2.20.24GitHubdocs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.15GitHubdocs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.7GitHubdocs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.1GitHubdocs.github.com/en/enterprise-server%402.20/admin/release-notes#2.20.24GitHubdocs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.15GitHubdocs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.7GitHubdocs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.1

How CyberStrike helps

Frequently asked questions

What is CVE-2021-22861?

CVE-2021-22861 is a medium-severity vulnerability. It was published on March 3, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-22861?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-22861?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-22861?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-22861 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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