CVE-2019-15580 in Community Edition
Summary
by MITRE
An information exposure vulnerability exists in gitlab.com <v12.3.2, <v12.2.6, and <v12.1.10 when using the blocking merge request feature, it was possible for an unauthenticated user to see the head pipeline data of a public project even though pipeline visibility was restricted.
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Analysis
by VulDB Data Team • 03/15/2024
This information exposure vulnerability in GitLab affects versions prior to 12.3.2, 12.2.6, and 12.1.10, specifically when the blocking merge request feature is utilized. The flaw represents a critical security oversight where unauthenticated users can access head pipeline data from public projects despite pipeline visibility restrictions being in place. This vulnerability directly contravenes the principle of least privilege and demonstrates a failure in access control enforcement within the GitLab platform's pipeline visibility mechanisms.
The technical implementation of this vulnerability stems from insufficient authorization checks when processing merge request blocking functionality. When a merge request is blocked, the system should enforce strict visibility controls that prevent unauthorized access to pipeline information. However, the flaw allows an attacker to bypass these controls and retrieve sensitive pipeline metadata without authentication. This issue is classified under CWE-200, Information Exposure, and aligns with ATT&CK technique T1592, Obtain Capabilities, as it enables adversaries to gather intelligence about project pipelines and build processes. The vulnerability specifically impacts the integrity of GitLab's access control model by permitting unauthorized data disclosure through the merge request blocking feature.
The operational impact of this vulnerability extends beyond simple information disclosure, as pipeline data often contains sensitive information about build processes, dependencies, and development workflows. An unauthenticated attacker can gain insights into project structure, development practices, and potential security weaknesses in the CI/CD pipeline. This exposure could facilitate more sophisticated attacks by providing threat actors with knowledge about project configurations, build artifacts, and potential entry points for further exploitation. The vulnerability affects all public projects utilizing the blocking merge request functionality, making it a widespread concern across GitLab installations.
Organizations should immediately upgrade to GitLab versions 12.3.2, 12.2.6, or 12.1.10 to remediate this vulnerability, as these releases contain the necessary patches to enforce proper access controls. Additional mitigations include reviewing and tightening pipeline visibility settings, implementing network-level restrictions, and monitoring for unauthorized access attempts. Security teams should also conduct comprehensive audits of their GitLab configurations to ensure that pipeline visibility controls are properly enforced across all projects. The vulnerability highlights the importance of thorough access control testing, particularly for features that involve complex interaction between different system components, and demonstrates the critical need for regular security assessments of collaborative development platforms.