Privilege Escalation in MongoDB Server via System Collection Access

Executive Summary

This vulnerability in MongoDB Server allows an authenticated user with a limited database-scoped role to access or modify protected system collections. These collections should require higher privileges, so the issue enables unauthorized exposure of metadata or data changes in certain configurations.

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Detection Guidance

This vulnerability involves unauthorized access to system collections in MongoDB due to insufficient privilege checks. To detect it, review MongoDB logs for unusual queries targeting system collections like admin.system.users or admin.system.roles. Check for users with database-scoped roles performing operations outside their intended scope. Use MongoDB commands such as db.getCollectionNames() to list collections and db.currentOp() to monitor active operations.

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Impact Analysis

An attacker with limited access could view sensitive collection metadata or alter system data, potentially leading to data leaks or corruption. This depends on deployment settings and the attacker's existing privileges.

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Compliance Impact

This vulnerability could violate data protection requirements by enabling unauthorized access or modification of sensitive data, potentially leading to compliance breaches under GDPR, HIPAA, or other regulations.

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Mitigation Strategies

Review and restrict database-scoped roles to ensure users cannot access protected system collections. Apply the latest MongoDB Server patches if available. Monitor system collection access logs for unusual activity.

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