CVE-2023-23762: Incorrect comparison vulnerability in GitHub Enterprise Server leading to commit smuggling
First published: Fri Apr 07 2023(Updated: )
An incorrect comparison vulnerability was identified in GitHub Enterprise Server that allowed commit smuggling by displaying an incorrect diff. To do so, an attacker would need write access to the repository and be able to correctly guess the target branch before it’s created by the code maintainer. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.9 and was fixed in versions 3.4.18, 3.5.15, 3.6.11, 3.7.8, and 3.8.1. 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 | <3.4.18 | |
| GitHub Enterprise Server | >=3.5.0<3.5.15 | |
| GitHub Enterprise Server | >=3.6.0<3.6.11 | |
| GitHub Enterprise Server | >=3.7.0<3.7.8 | |
| GitHub Enterprise Server | =3.8.0 |
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Reference Links
- https://docs.github.com/en/enterprise-server@3.4/admin/release-notes#3.4.18
- https://docs.github.com/en/enterprise-server@3.5/admin/release-notes#3.5.15
- https://docs.github.com/en/enterprise-server@3.6/admin/release-notes#3.6.11
- https://docs.github.com/en/enterprise-server@3.7/admin/release-notes#3.7.8
- https://docs.github.com/en/enterprise-server@3.8/admin/release-notes#3.8.1
Frequently Asked Questions
What is CVE-2023-23762?
CVE-2023-23762 is an incorrect comparison vulnerability in GitHub Enterprise Server that allows commit smuggling by displaying an incorrect diff.
What is the severity of CVE-2023-23762?
The severity of CVE-2023-23762 is medium with a CVSS score of 5.3.
How can an attacker exploit CVE-2023-23762?
An attacker with write access to the repository can exploit CVE-2023-23762 by correctly guessing the target branch before it's created by the code maintainer.
Which versions of GitHub Enterprise Server are affected by CVE-2023-23762?
GitHub Enterprise Server versions up to (but not including) 3.4.18, between 3.5.0 and 3.5.15, between 3.6.0 and 3.6.11, and between 3.7.0 and 3.7.8 are affected by CVE-2023-23762.
How can I fix CVE-2023-23762?
To fix CVE-2023-23762, update GitHub Enterprise Server to version 3.8.0 or later.
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