CVE-2021-41598: UI misrepresentation of granted permissions in GitHub Enterprise Server leading to unauthorized access to user
First published: Tue Jan 25 2022(Updated: )
A UI misrepresentation vulnerability was identified in GitHub Enterprise Server that allowed more permissions to be granted during a GitHub App's user-authorization web flow than was displayed to the user during approval. 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. All permissions being granted would properly be shown during the first authorization, but if the user later updated the set of repositories the app was installed on after the GitHub App had configured additional user-level permissions, those additional permissions would not be displayed, leading to more permissions being granted than the user potentially intended. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.3 and was fixed in versions 3.2.5, 3.1.13, 3.0.21. 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 | <3.0.21 | |
| GitHub Enterprise Server | >=3.1.0<3.1.13 | |
| GitHub Enterprise Server | >=3.2.0<3.2.5 |
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Reference Links
- https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.21
- https://docs.github.com/en/enterprise-server@3.1/admin/release-notes#3.1.13
- https://docs.github.com/en/enterprise-server@3.2/admin/release-notes#3.2.5
- https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.21
- https://docs.github.com/en/enterprise-server%403.1/admin/release-notes#3.1.13
- https://docs.github.com/en/enterprise-server%403.2/admin/release-notes#3.2.5
Frequently Asked Questions
What is CVE-2021-41598?
CVE-2021-41598 is a UI misrepresentation vulnerability in GitHub Enterprise Server.
How does CVE-2021-41598 work?
CVE-2021-41598 allows more permissions to be granted during a GitHub App's user-authorization web flow than is displayed to the user during approval.
What is the severity of CVE-2021-41598?
CVE-2021-41598 has a severity rating of 8.8 (high).
Which versions of GitHub Enterprise Server are affected by CVE-2021-41598?
GitHub Enterprise Server versions 3.0.21, 3.1.0 to 3.1.13, and 3.2.0 to 3.2.5 are affected by CVE-2021-41598.
How can I fix CVE-2021-41598?
To fix CVE-2021-41598, upgrade GitHub Enterprise Server to a version that is not affected (3.0.21, 3.1.13, or 3.2.5).
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