CVE-2023-3950 in Enterprise Edition
Summary
by MITRE • 09/01/2023
An information disclosure issue in GitLab EE affecting all versions from 16.2 prior to 16.2.5, and 16.3 prior to 16.3.1 allowed other Group Owners to see the Public Key for a Google Cloud Logging audit event streaming destination, if configured. Owners can now only write the key, not read it.
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Analysis
by VulDB Data Team • 09/29/2023
This vulnerability represents a critical information disclosure flaw in GitLab Enterprise Edition that emerged from improper access controls surrounding sensitive cryptographic materials. The issue specifically affected versions prior to 16.2.5 and 16.3.1, where Group Owners possessed elevated privileges that inadvertently granted them read access to Google Cloud Logging audit event streaming destination public keys. This represents a direct violation of the principle of least privilege and demonstrates how administrative roles can be improperly scoped in cloud integration configurations. The vulnerability stems from a lack of proper authorization checks when accessing audit streaming destinations, allowing unauthorized group members to extract sensitive cryptographic information that should remain restricted to specific administrative roles.
The technical implementation of this flaw involved the absence of proper access control validation within the GitLab audit streaming configuration interface. When administrators configured Google Cloud Logging integration for audit events, the system failed to enforce appropriate permission boundaries between different user roles within the same group. This misconfiguration allowed Group Owners to traverse the API endpoints that should have been restricted to system administrators or specific audit configuration roles. The vulnerability is categorized under CWE-284 which addresses improper access control, specifically in the context of insufficient authorization checks for sensitive data exposure. The flaw essentially created a privilege escalation path where users with lower administrative privileges could access information that should have been protected at a higher security level.
The operational impact of this vulnerability extends beyond simple information disclosure, as the exposed public keys could potentially be used for malicious purposes including credential harvesting, access token manipulation, or further exploitation of the integrated Google Cloud Logging infrastructure. Attackers who gained access to these keys could potentially correlate audit events with specific user activities, compromising the integrity of security monitoring systems and undermining the trust in audit trails. This vulnerability directly impacts the security posture of organizations relying on GitLab for code management while utilizing Google Cloud Logging for audit monitoring. The exposure of cryptographic keys in audit configurations creates a significant risk for organizations that depend on these integrations for compliance and security monitoring purposes, potentially leading to unauthorized access to audit logs and system activities.
Organizations should immediately implement the patch versions 16.2.5 and 16.3.1 to remediate this vulnerability and ensure proper access controls are enforced for audit streaming destinations. The mitigation strategy involves verifying that Group Owners cannot access audit configuration details, particularly cryptographic keys used for integration with cloud services. System administrators should review existing audit configurations and ensure that only designated personnel with appropriate clearance levels can access sensitive integration keys. Additionally, organizations should implement monitoring for unauthorized access attempts to audit configuration endpoints and establish proper segregation of duties for cloud integration management. This vulnerability highlights the importance of regular security assessments of integration points and proper role-based access control implementation, aligning with ATT&CK technique T1531 which focuses on establishing persistence through credential access and T1078 which addresses valid accounts and legitimate credentials. Organizations should also consider implementing additional controls such as key rotation policies and audit logging for configuration changes to prevent similar issues in the future.