CVE-2021-22867: Unsafe configuration options in GitHub Pages leading to path traversal on GitHub Enterprise Server
First published: Wed Jul 14 2021(Updated: )
A path traversal vulnerability was identified in GitHub Enterprise Server that could be exploited when building a GitHub Pages site. User-controlled configuration options used by GitHub Pages were not sufficiently restricted and made it possible to read files on the GitHub Enterprise Server instance. To exploit this vulnerability, an attacker would need permission to create and build a GitHub Pages site on the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.1.3 and was fixed in 3.1.3, 3.0.11, and 2.22.17. 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 | <2.22.17 | |
| GitHub Enterprise Server | >=3.0.0<3.0.11 | |
| GitHub Enterprise Server | >=3.1.0<3.1.3 |
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Reference Links
- https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.17
- https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.11
- https://docs.github.com/en/enterprise-server@3.1/admin/release-notes#3.1.3
- https://docs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.17
- https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.11
- https://docs.github.com/en/enterprise-server%403.1/admin/release-notes#3.1.3
Frequently Asked Questions
What is CVE-2021-22867?
CVE-2021-22867 is a path traversal vulnerability in GitHub Enterprise Server that allows an attacker to read files on the server.
How can the path traversal vulnerability in GitHub Enterprise Server be exploited?
The path traversal vulnerability in GitHub Enterprise Server can be exploited when building a GitHub Pages site.
What is the severity of CVE-2021-22867?
The severity of CVE-2021-22867 is medium with a CVSS score of 6.5.
Which versions of GitHub Enterprise Server are affected by CVE-2021-22867?
GitHub Enterprise Server versions 2.22.17, 3.0.0 to 3.0.11, and 3.1.0 to 3.1.3 are affected by CVE-2021-22867.
How do I fix the path traversal vulnerability in GitHub Enterprise Server (CVE-2021-22867)?
To fix the path traversal vulnerability in GitHub Enterprise Server (CVE-2021-22867), upgrade to a version that is not affected by the vulnerability.
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