CVE-2017-2322 in NorthStar Controller Application
Summary
by MITRE
A denial of service vulnerability in Juniper Networks NorthStar Controller Application prior to version 2.1.0 Service Pack 1, may allow an authenticated user to cause widespread denials of service to system services by consuming TCP and UDP ports which are normally reserved for other system services.
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Analysis
by VulDB Data Team • 04/25/2017
The vulnerability identified as CVE-2017-2322 represents a critical denial of service flaw within Juniper Networks NorthStar Controller Application affecting versions prior to 2.1.0 Service Pack 1. This vulnerability specifically targets the application's handling of network connections and resource allocation mechanisms, creating a pathway for authenticated attackers to systematically exhaust critical system resources. The NorthStar Controller serves as a central management platform for network infrastructure, making this vulnerability particularly concerning as it could disrupt core network operations and services. The flaw manifests when legitimate users can manipulate the application to consume excessive TCP and UDP ports that are designated for critical system services, effectively creating a resource exhaustion scenario that cascades throughout the network infrastructure.
The technical implementation of this vulnerability stems from inadequate resource management and connection handling within the NorthStar Controller's network service components. When an authenticated user exploits this weakness, the application fails to properly enforce resource limits on connection establishment and port allocation, allowing malicious users to consume ports that should remain reserved for essential system functions. This behavior aligns with CWE-400, which categorizes resource exhaustion vulnerabilities as those that occur when applications fail to properly manage system resources, leading to denial of service conditions. The flaw operates at the network protocol level where the controller's service management logic does not adequately validate or constrain the number of concurrent connections or port usage patterns, enabling a single authenticated user to potentially compromise multiple system services simultaneously.
The operational impact of CVE-2017-2322 extends far beyond simple service disruption, as it can effectively paralyze network operations by consuming critical system resources that other essential services depend upon. When TCP and UDP ports reserved for system services are exhausted, network management functions, monitoring capabilities, and communication channels between network devices become unavailable or severely degraded. This vulnerability directly maps to ATT&CK technique T1499.004, which describes network denial of service attacks that target system resources, and can be leveraged by attackers to create persistent service unavailability. The cascading effect means that network administrators may find their ability to monitor, configure, or troubleshoot network infrastructure severely compromised, as the very tools and services they rely upon for network management become unavailable due to resource exhaustion caused by the vulnerability.
Organizations affected by this vulnerability should immediately implement mitigations including applying the patched version 2.1.0 Service Pack 1 or higher, implementing network segmentation to isolate the NorthStar Controller from critical network services, and establishing monitoring rules to detect unusual port consumption patterns. Additionally, access controls should be tightened to limit authentication privileges to only necessary personnel, as the vulnerability requires authenticated access to exploit. Security teams should also implement connection rate limiting and port allocation monitoring within their network infrastructure to detect potential exploitation attempts. The vulnerability demonstrates the importance of proper resource management in network controller applications and serves as a reminder that centralized management platforms must implement robust resource isolation and allocation controls to prevent single points of failure that could compromise entire network operations.