CVE-2018-18647 in Community Edition
Summary
by MITRE
An issue was discovered in GitLab Community and Enterprise Edition before 11.2.7, 11.3.x before 11.3.8, and 11.4.x before 11.4.3. It has Missing Authorization.
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Analysis
by VulDB Data Team • 06/13/2023
The vulnerability identified as CVE-2018-18647 represents a critical authorization flaw in GitLab's access control mechanisms that affected multiple versions of the popular DevOps platform. This issue stems from insufficient validation of user permissions within the application's core functionality, allowing unauthorized individuals to access restricted resources and perform actions they should not be permitted to execute. The vulnerability impacts both Community and Enterprise editions of GitLab, making it particularly concerning given the widespread adoption of the platform across organizations of all sizes. The flaw specifically manifests in scenarios where the application fails to properly verify whether a user possesses the necessary privileges to access specific project resources or execute administrative functions.
The technical nature of this authorization bypass vulnerability can be categorized under CWE-863, which specifically addresses Incorrect Authorization conditions within software systems. This weakness allows attackers to exploit the application's failure to enforce proper access controls, potentially enabling them to view confidential project data, modify repository contents, or perform administrative operations without appropriate credentials. The vulnerability occurs due to inadequate input validation and insufficient privilege checks within GitLab's authentication flow, particularly affecting the platform's ability to distinguish between authorized and unauthorized users when accessing sensitive project resources. Attackers can leverage this flaw to gain unauthorized access to private repositories, project settings, and other protected functionality that should only be accessible to legitimate project members or administrators.
The operational impact of CVE-2018-18647 extends beyond simple data exposure, as it fundamentally undermines the security posture of organizations relying on GitLab for their version control and collaboration needs. Organizations may experience unauthorized code modifications, data leakage, and potential compromise of intellectual property when this vulnerability is exploited. The attack surface is particularly broad given that GitLab serves as a central hub for software development workflows, making it an attractive target for threat actors seeking to infiltrate development environments and access sensitive source code repositories. The vulnerability also creates opportunities for attackers to escalate privileges within the platform, potentially leading to complete compromise of the GitLab instance and associated projects. Additionally, the widespread use of GitLab across various industries means that this vulnerability could affect organizations in sectors such as finance, healthcare, and government, where data protection and access control are paramount.
Mitigation strategies for CVE-2018-18647 should prioritize immediate patching of affected GitLab installations to versions 11.2.7, 11.3.8, or 11.4.3, depending on the specific edition in use. Organizations should also implement network segmentation and access controls to limit exposure of GitLab instances to unauthorized network segments. Security teams should conduct comprehensive audits of existing GitLab permissions and access controls, ensuring that proper role-based access controls are enforced throughout the platform. Regular security assessments and penetration testing should be performed to identify potential authorization gaps within the GitLab environment. The ATT&CK framework categorizes this vulnerability under T1078 Valid Accounts and T1566 Phishing, as attackers may exploit the authorization bypass to establish persistent access to development environments. Organizations should also consider implementing additional monitoring and logging mechanisms to detect suspicious access patterns that may indicate exploitation attempts, particularly focusing on unusual administrative activities or unauthorized access to sensitive repositories.