CVE-2019-9221 in Community Edition
Summary
by MITRE
An issue was discovered in GitLab Community and Enterprise Edition before 11.6.10, 11.7.x before 11.7.6, and 11.8.x before 11.8.1. It has Incorrect Access Control (issue 3 of 5).
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Analysis
by VulDB Data Team • 09/25/2023
The vulnerability described in CVE-2019-9221 represents a critical access control flaw affecting GitLab Community and Enterprise Edition installations across multiple version streams. This issue falls under the broader category of improper access control mechanisms that can lead to unauthorized privilege escalation and data exposure. The vulnerability specifically impacts versions prior to 11.6.10, 11.7.6, and 11.8.1 respectively, indicating a widespread concern affecting the core authentication and authorization systems within GitLab's platform. The classification as an incorrect access control issue aligns with CWE-285 which addresses improper authorization within software systems, making this vulnerability particularly dangerous for organizations relying on GitLab for version control and collaboration.
The technical implementation of this access control flaw allows malicious actors to bypass intended security restrictions and gain unauthorized access to resources that should be restricted to specific user roles or permissions. This typically occurs when the application fails to properly validate user privileges or when authorization checks are improperly implemented in the codebase. In GitLab's case, the vulnerability likely exists in how the platform handles permission validation for various operations including repository access, project management, and user privilege escalation. The flaw may manifest through insufficient input validation, missing authorization checks, or improper session management that allows attackers to manipulate access controls through crafted requests or by exploiting existing user sessions.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data breaches, code exposure, and privilege escalation that could allow attackers to assume administrator roles within affected GitLab instances. Organizations utilizing vulnerable GitLab versions face significant risk of exposure to sensitive source code repositories, confidential project information, and user data that could be accessed or modified by unauthorized parties. The vulnerability creates a pathway for attackers to potentially gain access to private repositories, modify project configurations, or even execute arbitrary code if the access control bypass extends to system-level operations. This threat is particularly severe given GitLab's role as a central collaboration platform for software development teams, where unauthorized access could compromise entire development pipelines and intellectual property.
Mitigation strategies for CVE-2019-9221 require immediate patching of affected GitLab installations to the recommended versions that contain the necessary access control fixes. Organizations should conduct comprehensive inventory assessments to identify all vulnerable GitLab instances across their infrastructure and prioritize remediation efforts accordingly. The implementation of additional security controls including network segmentation, enhanced monitoring of access patterns, and regular security audits can provide defense-in-depth measures while patches are deployed. Security teams should also consider implementing automated vulnerability scanning tools that can detect and alert on potential access control bypass attempts. From a compliance perspective, this vulnerability may trigger requirements under standards such as iso 27001 and nist cybersecurity framework, which mandate proper access control implementations and regular vulnerability management processes. The ATT&CK framework categorizes this type of vulnerability under privilege escalation techniques, specifically targeting the 'T1078 Valid Accounts' and 'T1484 Enterprise Triage' tactics that attackers use to maintain persistence and expand their access within compromised environments.