Information disclosure in GitHub Enterprise Server leading to unauthorized viewing of private repository names
Vulnerability Description
An information disclosure vulnerability was identified in GitHub Enterprise Server that allowed private repositories to be added to a GitHub Actions runner group via the API by a user who did not have access to those repositories, resulting in the repository names being shown in the UI. To exploit this vulnerability, an attacker would need access to the GHES instance, permissions to modify GitHub Actions runner groups, and successfully guess the obfuscated ID of private repositories. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.7 and was fixed in versions 3.3.17, 3.4.12, 3.5.9, 3.6.5. This vulnerability was reported via the GitHub Bug Bounty program.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Anthony Bouvet (Kuromatae)
References
- https://docs.github.com/en/enterprise-server%403.3/admin/release-notes#3.3.17
- https://docs.github.com/en/enterprise-server%403.4/admin/release-notes#3.4.12
- https://docs.github.com/en/enterprise-server%403.5/admin/release-notes#3.5.9
- https://docs.github.com/en/enterprise-server%403.6/admin/release-notes#3.6.5
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