CVE-2024-39895 in Directus
Summary
by MITRE • 07/08/2024
Directus is a real-time API and App dashboard for managing SQL database content. A denial of service (DoS) attack by field duplication in GraphQL is a type of attack where an attacker exploits the flexibility of GraphQL to overwhelm a server by requesting the same field multiple times in a single query. This can cause the server to perform redundant computations and consume excessive resources, leading to a denial of service for legitimate users. Request to the endpoint /graphql are sent when visualizing graphs generated at a dashboard. By modifying the data sent and duplicating many times the fields a DoS attack is possible. This vulnerability is fixed in 10.12.0.
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Analysis
by VulDB Data Team • 01/03/2025
The vulnerability identified as CVE-2024-39895 affects Directus, a real-time API and application dashboard designed for managing SQL database content through an intuitive interface. This issue represents a denial of service attack that specifically targets the GraphQL endpoint within the Directus platform, exploiting the inherent flexibility of GraphQL query structures to overwhelm server resources. The vulnerability manifests when attackers craft malicious GraphQL queries that contain duplicated fields, leveraging the query parsing mechanism to generate excessive computational overhead and resource consumption. The attack vector is particularly relevant in dashboard environments where graph visualization components frequently make GraphQL requests to the /graphql endpoint, making this vulnerability especially dangerous in production environments where user access and data visualization are critical functions. The vulnerability stems from insufficient input validation and query processing controls within the GraphQL implementation, allowing attackers to craft queries that appear legitimate but contain redundant field references that multiply the computational workload.
The technical flaw resides in the GraphQL query processing logic of Directus where duplicate field references are not adequately detected or handled, resulting in redundant computation cycles and memory allocation. When a GraphQL query contains the same field multiple times, the server's GraphQL resolver executes the same operations repeatedly, causing unnecessary CPU and memory consumption. This behavior creates a resource exhaustion scenario where legitimate user requests may be denied service due to the server's inability to handle concurrent legitimate queries while processing the malicious duplicated field requests. The vulnerability specifically impacts the server-side query execution engine that processes GraphQL requests, and the lack of field deduplication mechanisms in the query parsing pipeline allows this attack to succeed. According to CWE classification, this vulnerability maps to CWE-400, which addresses "Uncontrolled Resource Consumption" or "Denial of Service" conditions that arise from inadequate resource management in software applications. The flaw represents a classic example of how flexible query languages can be exploited when proper input sanitization and resource limiting mechanisms are not implemented.
The operational impact of CVE-2024-39895 extends beyond simple service disruption, potentially compromising the availability of critical dashboard functionalities and user access to database content. When exploited, this vulnerability can cause cascading effects throughout the Directus application, as the server's resources become consumed by processing malicious queries, leading to degraded performance or complete service unavailability for legitimate users. The attack is particularly effective in dashboard environments where graph visualization components continuously poll the GraphQL endpoint, providing attackers with sustained opportunities to maintain resource exhaustion conditions. In production scenarios, this vulnerability could result in business disruption, data access delays, and potential revenue loss for organizations relying on Directus for content management and database visualization. The vulnerability also creates opportunities for attackers to perform reconnaissance and establish persistent access patterns, as the resource exhaustion conditions may be used to mask other malicious activities. Organizations utilizing Directus in mission-critical applications face significant risk from this vulnerability, particularly those with high user traffic or those relying on real-time data visualization capabilities.
Mitigation strategies for CVE-2024-39895 should prioritize immediate implementation of the vendor-provided fix in Directus version 10.12.0, which addresses the root cause through enhanced GraphQL query processing and field deduplication mechanisms. Organizations should implement additional defensive measures including query rate limiting, maximum query depth restrictions, and field repetition detection within their GraphQL endpoints to prevent similar vulnerabilities from manifesting in other systems. Network-level protections such as API gateways with query validation and resource consumption monitoring can provide additional layers of defense against this type of attack. The implementation of monitoring solutions that track GraphQL query patterns and resource utilization can help identify potential attacks before they cause significant disruption. From an ATT&CK framework perspective, this vulnerability aligns with techniques categorized under T1499.004, "Endpoint Denial of Service," and T1595.001, "Network Denial of Service," highlighting the need for comprehensive endpoint protection and network-level defense strategies. Regular security assessments and penetration testing should include GraphQL endpoint vulnerability scanning to identify similar weaknesses in custom implementations or third-party integrations that may be susceptible to similar attacks.