CVE-2020-13300 : What You Need to Know
Learn about CVE-2020-13300, an improper authorization vulnerability in GitLab CE/EE version 13.3 allowing unauthorized changes to OAuth authorization scopes. Find mitigation steps and patching advice here.
GitLab CE/EE version 13.3 prior to 13.3.4 was vulnerable to an OAuth authorization scope change without user consent in the middle of the authorization flow.
Understanding CVE-2020-13300
This CVE involves an improper authorization vulnerability in GitLab that could allow an attacker to change OAuth authorization scopes without user consent.
What is CVE-2020-13300?
- Vulnerability in GitLab CE/EE version 13.3 before 13.3.4
- Allows unauthorized changes to OAuth authorization scopes
- Reported by fushbey through HackerOne
The Impact of CVE-2020-13300
- CVSS Score: 8 (High)
- Severity: High
- Attack Vector: Network
- Confidentiality Impact: High
- Integrity Impact: High
- User Interaction: Required
- Scope: Changed
- Attack Complexity: High
- Privileges Required: None
- Availability Impact: None
Technical Details of CVE-2020-13300
This section provides detailed technical information about the vulnerability.
Vulnerability Description
- Improper authorization in GitLab
Affected Systems and Versions
- Product: GitLab
- Vendor: GitLab
- Versions Affected: >=13.3, <13.3.4
Exploitation Mechanism
- Attacker can change OAuth authorization scopes without user consent
Mitigation and Prevention
Protect your systems from CVE-2020-13300 with these mitigation strategies.
Immediate Steps to Take
- Update GitLab to version 13.3.4 or newer
- Monitor OAuth authorization activities for suspicious changes
Long-Term Security Practices
- Regularly review and update OAuth authorization settings
- Conduct security training for users on recognizing unauthorized scope changes
Patching and Updates
- Apply security patches promptly to prevent exploitation of vulnerabilities