CyberWatch

Critical SAML SSO Vulnerability in GitHub Enterprise Server

By

Matthew Fagan and Alexander Marshall, Access Point Consulting

By

Access Point Consulting

Summary

GitHub has remediated an authentication bypass vulnerability under CVE-2024-4985 (CVSSv4: 10.0). This vulnerability allows an attacker to use SAML single sign-on (SSO) authentication to sign in as a user with administrator privileges. This affects GitHub Enterprise Server (GHES) versions prior to 3.13.0 that use SAML SSO with encrypted assertions.

Impact Assessment

  • CVSS Score: 10.0 (Critical)
  • Affected Versions: GHES prior to 3.13.0
  • Conditions: Only affects instances with SAML SSO and encrypted assertions enabled.

Urgency

This vulnerability requires immediate attention due to its severity and potential for exploitation.

Remediation

  • Fixed Versions: 3.9.15, 3.10.12, 3.11.10, 3.12.4, and upcoming 3.13.0.
  • Upgrade Guide: GitHub Docs


Business Implications

Exploitation could lead to unauthorized access, data exfiltration, and injection of malicious code, resulting in significant data, monetary, and reputational loss.

Recommendations

  • Patch: Upgrade to the latest GHES version immediately.
  • Mitigate: Disable encrypted assertions until the upgrade is completed.

Communication Plan

  • Stakeholders: Inform security teams, IT operations, and executive management about the urgency and impact.
  • Internal Notification: Use provided templates to communicate the required actions to all relevant teams.

Associated Bulletin

For more information or assistance, contact:

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