CVE-2021-22865: Improper access control in GitHub Enterprise Server leading to unauthorized read access to private repository metadata
First published: Fri Apr 02 2021(Updated: )
An improper access control vulnerability was identified in GitHub Enterprise Server that allowed access tokens generated from a GitHub App's web authentication flow to read private repository metadata via the REST API without having been granted the appropriate permissions. To exploit this vulnerability, an attacker would need to create a GitHub App on the instance and have a user authorize the application through the web authentication flow. The private repository metadata returned would be limited to repositories owned by the user the token identifies. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.0.4 and was fixed in versions 3.0.4, 2.22.10, 2.21.18. This vulnerability was reported via the GitHub Bug Bounty program.
Credit: product-cna@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| GitHub Enterprise Server | <2.21.18 | |
| GitHub Enterprise Server | >=2.22.0<2.22.10 | |
| GitHub Enterprise Server | >=3.0.0<3.0.4 |
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Reference Links
- https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.18
- https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.10
- https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.4
- https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.4
- https://docs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.10
- https://docs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.18
Frequently Asked Questions
What is CVE-2021-22865?
CVE-2021-22865 is an improper access control vulnerability in GitHub Enterprise Server.
How does CVE-2021-22865 impact GitHub Enterprise Server?
CVE-2021-22865 allows access tokens generated from a GitHub App's web authentication flow to read private repository metadata via the REST API without having the appropriate permissions.
What is the severity of CVE-2021-22865?
CVE-2021-22865 has a severity level of medium with a CVSS score of 6.5.
Which versions of GitHub Enterprise Server are affected by CVE-2021-22865?
GitHub Enterprise Server versions 2.21.18 to 2.22.10 and versions 3.0.0 to 3.0.4 are affected by CVE-2021-22865.
How can I fix CVE-2021-22865?
To fix CVE-2021-22865, update your GitHub Enterprise Server to a version that is not affected by the vulnerability.
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