CVE-2019-5472 in Community Edition
Summary
by MITRE
An authorization issue was discovered in Gitlab versions < 12.1.2, < 12.0.4, and < 11.11.6 that prevented owners and maintainer to delete epic comments.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 03/27/2024
The vulnerability identified as CVE-2019-5472 represents a critical authorization flaw within GitLab's access control mechanisms that affected multiple versions of the popular DevOps platform. This issue specifically targeted the permissions model governing epic comment management, creating a scenario where users with elevated privileges could not perform essential administrative functions. The flaw manifested in GitLab versions prior to 12.1.2, 12.0.4, and 11.11.6, indicating a widespread impact across the software's release lifecycle. The authorization bypass occurred at the application level where the system failed to properly validate user permissions when attempting to delete epic comments, thereby undermining the intended access control policies.
The technical implementation of this vulnerability stems from insufficient permission validation within GitLab's epic comment deletion functionality. When users with owner or maintainer roles attempted to remove epic comments, the application failed to properly authenticate their elevated privileges, resulting in unauthorized access restrictions. This flaw operates as a direct violation of the principle of least privilege, where legitimate users with appropriate permissions were denied access to core administrative functions. The issue falls under the category of improper access control as classified by CWE-285, specifically manifesting as a weakness in authorization validation that allows unauthorized users to perform privileged operations. The vulnerability represents a classic case of insufficient authorization checks where the system failed to properly verify user roles and permissions before executing sensitive operations.
The operational impact of CVE-2019-5472 extends beyond simple administrative inconvenience to potentially compromise the integrity of project management workflows within GitLab environments. Organizations relying on epic comment functionality for tracking project progress, managing requirements, and coordinating team activities faced significant disruptions when authorized personnel could not delete comments they were entitled to remove. This limitation particularly affected project maintainers who needed to clean up outdated or irrelevant comments, potentially leading to cluttered project boards and reduced operational efficiency. The vulnerability created a scenario where legitimate administrative actions were blocked, forcing users to either downgrade their GitLab installations or implement workarounds that could introduce additional security risks. From an attacker's perspective, this flaw could potentially be exploited to disrupt workflow processes or create denial-of-service conditions by preventing authorized users from managing project content effectively.
Mitigation strategies for CVE-2019-5472 primarily focus on immediate version upgrades to patched releases where GitLab addressed the authorization validation issues. Organizations should prioritize updating their GitLab installations to versions 12.1.2, 12.0.4, or 11.11.6, depending on their current release cycle, as these versions contain the necessary fixes for the authorization bypass. Additionally, system administrators should conduct comprehensive audits of their existing GitLab configurations to identify any custom permission settings that might have been affected by the vulnerability. The remediation process should include verification that all user roles maintain appropriate access levels and that the authorization mechanisms function correctly across all epic comment operations. Security teams should implement monitoring procedures to detect any unusual access patterns or failed authorization attempts that might indicate exploitation attempts. Organizations should also review their incident response procedures to ensure readiness for potential exploitation of similar authorization flaws, as this vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation through improper access control mechanisms. The fix implemented by GitLab addressed the core authorization validation logic, ensuring that owner and maintainer roles receive proper permissions for epic comment management operations while maintaining the integrity of the overall access control framework.