CVE-2020-13352 in Community Edition
Summary
by MITRE • 11/17/2020
Private group info is leaked leaked in GitLab CE/EE version 10.2 and above, when the project is moved from private to public group. Affected versions are: >=10.2, =13.4, =13.5,
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Analysis
by VulDB Data Team • 12/08/2020
This vulnerability represents a critical information disclosure flaw in GitLab Community Edition and Enterprise Edition platforms affecting versions 10.2 through 13.5. The issue occurs when a project is migrated from a private group to a public group, resulting in the unauthorized exposure of private group information that should have remained confidential. This represents a significant failure in access control mechanisms and data isolation principles that are fundamental to secure software development practices. The vulnerability falls under the category of improper access control as defined by CWE-284, where the system fails to properly enforce access restrictions on sensitive data. From an operational security perspective, this flaw directly violates the principle of least privilege and could enable attackers to gain unauthorized access to sensitive project metadata, user information, and organizational data that was previously restricted to authorized group members only.
The technical implementation of this vulnerability stems from inadequate data sanitization during the group migration process. When GitLab processes the transition from private to public group status, the system fails to properly remove or obscure private group metadata that should not be accessible to the public. This creates a persistent information leak where historical private group data remains accessible through various API endpoints and user interfaces even after the group status has been changed. The flaw demonstrates a weakness in GitLab's privilege management system, specifically in how it handles data migration and access control enforcement during group state transitions. The vulnerability can be exploited through multiple vectors including direct API calls, web interface access, and potentially automated scanning tools that can enumerate group information. According to ATT&CK framework category T1213, this represents a data access technique where adversaries can obtain information about protected data sources through improper access controls.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially compromise organizational security posture and intellectual property protection. Attackers could exploit this vulnerability to discover sensitive project timelines, team member information, internal project structures, and other confidential metadata that was intended to remain private. This information leakage could facilitate more sophisticated attacks including social engineering campaigns, targeted phishing attempts, or competitive intelligence gathering. Organizations using affected GitLab versions may have unknowingly exposed private group information to public access, creating potential compliance violations under data protection regulations such as gdpr, hipaa, or soc 2 requirements. The vulnerability affects both the git repository functionality and the broader project management features within GitLab, making it a systemic issue rather than a localized component failure. Security teams may need to conduct comprehensive audits of their GitLab installations to identify any previously leaked information and assess the potential impact on their overall security infrastructure.
Mitigation strategies for this vulnerability require immediate action including upgrading to patched versions of GitLab, implementing additional access control monitoring, and conducting thorough security assessments of existing group configurations. Organizations should implement automated scanning processes to identify any remaining exposed private information and establish proper monitoring for unauthorized access patterns. The recommended remediation includes applying the official security patches released by GitLab, which address the specific access control implementation issues during group migration processes. Additionally, organizations should review their existing GitLab configurations to ensure proper access controls are enforced and consider implementing additional security measures such as enhanced audit logging and privilege management policies. From a compliance standpoint, affected organizations may need to notify stakeholders and regulatory bodies of the potential data exposure, particularly if sensitive information was accessible to unauthorized parties during the vulnerability window. The incident highlights the importance of regular security assessments and proper configuration management in maintaining secure software development environments.