CVE-2020-13341 in GitLab
Summary
by MITRE • 10/12/2020
An issue has been discovered in GitLab affecting all versions prior to 13.2.10, 13.3.7 and 13.4.2. Insufficient permission check allows attacker with developer role to perform various deletions.
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Analysis
by VulDB Data Team • 11/18/2020
The vulnerability identified as CVE-2020-13341 represents a critical authorization flaw within GitLab's access control mechanisms that has persisted across multiple version branches. This issue affects all GitLab installations prior to the patched releases of 13.2.10, 13.3.7, and 13.4.2, creating a significant security risk for organizations relying on the platform for version control and collaboration. The flaw stems from inadequate permission validation checks that fail to properly enforce role-based access controls, allowing malicious actors with minimal privileges to execute unauthorized destructive operations.
The technical implementation of this vulnerability manifests through insufficient validation of user permissions during deletion operations within GitLab's web interface and API endpoints. Attackers with the developer role can exploit this weakness to perform various deletion actions that should typically be restricted to users with higher privileges such as maintainer or administrator roles. This includes the ability to delete projects, repositories, issues, and other critical resources within the GitLab instance. The flaw operates at the application logic level, where the system fails to properly verify whether the authenticated user possesses sufficient permissions before executing destructive operations, creating a direct path for privilege escalation through unauthorized resource manipulation.
The operational impact of CVE-2020-13341 extends beyond simple data loss, as it enables attackers to disrupt development workflows and potentially compromise entire development environments. Organizations utilizing GitLab for continuous integration and deployment pipelines face heightened risk of service disruption when attackers exploit this vulnerability to delete critical repositories or project configurations. The vulnerability particularly affects collaborative development environments where multiple developers contribute to shared projects, as an attacker with developer access can cause significant damage to project integrity and team productivity. From a compliance perspective, this vulnerability creates audit trail issues and potential regulatory violations when unauthorized deletions occur within version control systems.
Mitigation strategies for CVE-2020-13341 center on immediate patch deployment to the affected GitLab versions, with organizations prioritizing updates to the latest stable releases to ensure complete protection. System administrators should conduct comprehensive audits of their GitLab installations to identify any instances running vulnerable versions and implement mandatory update procedures. Additionally, organizations should review their existing access control policies to ensure that developers do not possess unnecessary permissions that could be exploited through similar vulnerabilities. The remediation process should include monitoring for suspicious deletion activities and implementing additional logging mechanisms to detect unauthorized access attempts. This vulnerability aligns with CWE-284, which addresses improper access control, and maps to ATT&CK technique T1078 for valid accounts and privilege escalation through unauthorized system access. Organizations should also consider implementing network segmentation and additional authentication controls to reduce the potential impact of such vulnerabilities in their overall security posture.