CVE-2020-13290 in GitLab
Summary
by MITRE
In GitLab before 13.0.12, 13.1.6, and 13.2.3, improper access control was used on the Applications page.
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Analysis
by VulDB Data Team • 11/08/2020
The vulnerability identified as CVE-2020-13290 represents a critical access control flaw within GitLab's web application interface that affected multiple versions prior to 13.0.12, 13.1.6, and 13.2.3. This issue specifically targeted the Applications page functionality, which serves as a central hub for managing third-party integrations and OAuth applications within GitLab's platform. The improper access control mechanism allowed unauthorized users to gain access to sensitive application configuration data and management functions that should have been restricted to authorized administrators or project members with appropriate permissions.
The technical implementation of this vulnerability stems from insufficient authorization checks within the Applications page controller logic. When users navigated to the applications management interface, the system failed to properly validate user permissions before rendering application-specific data and administrative functions. This flaw aligns with CWE-285, which addresses improper authorization in software systems, and represents a classic case of privilege escalation through inadequate access controls. Attackers could exploit this weakness to view, modify, or delete applications configured by other users, potentially leading to unauthorized access to integrated services and data.
The operational impact of this vulnerability extends beyond simple data exposure, as it could enable attackers to manipulate OAuth applications and potentially gain access to connected third-party services. An attacker with minimal privileges could leverage this vulnerability to escalate their access level within the GitLab instance, potentially accessing projects, repositories, and sensitive configuration data. The implications are particularly severe in enterprise environments where GitLab serves as a central code repository and collaboration platform, as this flaw could allow unauthorized users to compromise entire development workflows and access control boundaries established by legitimate administrators. The vulnerability directly contradicts the principle of least privilege and violates fundamental security concepts outlined in the NIST Cybersecurity Framework.
Mitigation strategies for CVE-2020-13290 require immediate implementation of the vendor-provided security patches for GitLab versions 13.0.12, 13.1.6, and 13.2.3. Organizations should also conduct comprehensive audits of their GitLab installations to identify any potential exploitation attempts and review access control policies for applications and integrations. System administrators should implement additional monitoring for unusual access patterns to the applications page and consider implementing network-level controls to restrict access to sensitive administrative interfaces. The remediation process should include verification that all users have appropriate permission levels and that the access control mechanisms are functioning correctly. Organizations may also want to consider implementing the ATT&CK framework's privilege escalation techniques to better understand and defend against potential exploitation paths, ensuring that any access control improvements align with established security best practices and reduce the attack surface for similar vulnerabilities.