CVE-2018-17939 in Community Edition
Summary
by MITRE
An issue was discovered in GitLab Community and Enterprise Edition 11.1.x before 11.1.8, 11.2.x before 11.2.5, and 11.3.x before 11.3.2. There is Information Exposure via the merge request JSON endpoint.
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Analysis
by VulDB Data Team • 04/17/2020
This vulnerability in GitLab affects versions prior to specific patch releases and represents an information exposure flaw that could potentially compromise sensitive data within the merge request functionality. The issue resides in the merge request JSON endpoint which inadvertently reveals confidential information to unauthorized users who may not have proper access permissions. This type of vulnerability falls under the category of improper access control where the system fails to properly validate user privileges before exposing data through API endpoints.
The technical implementation of this flaw allows attackers to access merge request details through the JSON endpoint without sufficient authentication or authorization checks. When users request merge request information via the API, the system returns more data than intended, potentially exposing internal project details, user information, or other sensitive metadata that should be restricted to authorized personnel only. This represents a classic case of insufficient input validation and access control enforcement within the application's API layer.
The operational impact of this vulnerability extends beyond simple data leakage as it could enable attackers to gather intelligence about project structures, team compositions, and development workflows. Security researchers have noted that such information exposure can facilitate more sophisticated attacks by providing attackers with detailed knowledge of target systems. The vulnerability affects both Community and Enterprise editions, indicating it's a core functionality issue rather than a feature-specific problem. Organizations using affected GitLab versions may unknowingly expose sensitive project information to unauthorized parties, potentially leading to intellectual property theft or targeted attacks against development teams.
Mitigation strategies should focus on immediate patching of affected GitLab installations to versions 11.1.8, 11.2.5, or 11.3.2 respectively. Additionally, organizations should implement network-level controls to restrict access to GitLab API endpoints and conduct thorough access control reviews to ensure proper user permissions are enforced. Security teams should also monitor for any unauthorized access attempts or unusual API usage patterns that might indicate exploitation attempts. This vulnerability aligns with CWE-200 (Information Exposure) and could be categorized under ATT&CK technique T1083 (File and Directory Discovery) when exploited by adversaries seeking to gather system information. Organizations should also consider implementing API rate limiting and additional authentication layers to reduce the attack surface and prevent automated exploitation attempts.