CVE-2022-23738 : Security Advisory and Response

An improper cache key vulnerability in GitHub Enterprise Server allowed unauthorized access to private repository files through a public repository. This article explains the impact, technical details, and mitigation steps for CVE-2022-23738.

Understanding CVE-2022-23738

This section provides insights into the nature and implications of the incomplete cache verification issue in GitHub Enterprise Server.

What is CVE-2022-23738?

CVE-2022-23738 is associated with an improper cache key vulnerability in GitHub Enterprise Server that enabled unauthorized actors to view private repository files via a public repository.

The Impact of CVE-2022-23738

The vulnerability required an already authorized actor on GitHub Enterprise Server to create a public repository and have a site administrator visit a specially crafted URL. This issue affected all versions prior to 3.6 and was resolved in versions 3.2.20, 3.3.15, 3.4.10, 3.5.7, and 3.6.3. The vulnerability was reported through the GitHub Bug Bounty program.

Technical Details of CVE-2022-23738

Explore the specific technical aspects of the vulnerability, including its description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The incomplete cache verification issue in GitHub Enterprise Server allowed an attacker to exploit the vulnerability and gain access to private repository files.

Affected Systems and Versions

GitHub Enterprise Server versions 3.2, 3.3, 3.4, 3.5, and 3.6 were affected by this vulnerability, with specific details provided for each version.

Exploitation Mechanism

To exploit this vulnerability, an actor had to create a public repository, be authorized on the GitHub Enterprise Server, and manipulate a URL to trick a site admin into accessing the illicit content.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2022-23738, including immediate steps and long-term security practices.

Immediate Steps to Take

Users are advised to update their GitHub Enterprise Server to the patched versions (3.2.20, 3.3.15, 3.4.10, 3.5.7, or 3.6.3) to prevent exploitation of this vulnerability.

Long-Term Security Practices

Implementing access control measures and regular security updates can help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly applying software patches and updates from GitHub can ensure the security of GitHub Enterprise Server against known vulnerabilities.