CVE-2022-23739 : Exploit Details and Defense Strategies

An incorrect authorization vulnerability in GitHub Enterprise Server has been identified, leading to an escalation of privileges in GraphQL API requests from GitHub Apps. This CVE impacts versions prior to 3.7.1 and allows unauthorized access to organization-level resources.

Understanding CVE-2022-23739

This section delves into the details of the incorrect authorization vulnerability in GitHub Enterprise Server that enables the escalation of privileges in GraphQL API requests.

What is CVE-2022-23739?

The vulnerability in GitHub Enterprise Server permits apps to gain unauthorized access to and modify most organization-level resources not associated with a repository. This loophole enables apps to interact with users and organization-wide projects without the necessary permissions.

The Impact of CVE-2022-23739

This vulnerability affects all versions of GitHub Enterprise Server before 3.7.1. It allows unauthorized apps to access and manipulate organization-level resources, except for repository-specific data like file content, projects, issues, and pull requests.

Technical Details of CVE-2022-23739

This section outlines the specific technical aspects of the CVE, including the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability allows apps to escalate privileges in GraphQL API requests, granting access to organization-level resources beyond repository-specific information.

Affected Systems and Versions

GitHub Enterprise Server versions 3.3 to 3.7 are affected by this vulnerability, with fixes implemented in versions 3.3.16, 3.4.11, 3.5.8, 3.6.4, and 3.7.1.

Exploitation Mechanism

Unauthorized apps exploit the incorrect authorization check to gain escalated privileges in GraphQL API requests, accessing and modifying organization-level resources.

Mitigation and Prevention

This section provides guidance on addressing and preventing the risks associated with CVE-2022-23739.

Immediate Steps to Take

Users of GitHub Enterprise Server should update to versions 3.3.16, 3.4.11, 3.5.8, 3.6.4, or 3.7.1 to mitigate the vulnerability and prevent unauthorized access to organization-level resources.

Long-Term Security Practices

Implement strict access control measures, regularly review and update permissions, and monitor API requests for unauthorized access attempts to enhance long-term security.

Patching and Updates

Regularly check for updates and patches released by GitHub to ensure the security and integrity of the GitHub Enterprise Server.