CVE-2017-2321 in NorthStar Controller Application
Summary
by MITRE
A vulnerability in Juniper Networks NorthStar Controller Application prior to version 2.1.0 Service Pack 1 may allow an unauthenticated, unprivileged, network-based attacker to cause various system services partial to full denials of services, modification of system states and files, and potential disclosure of sensitive information which may assist the attacker in further attacks on the system through the use of multiple attack vectors, including man-in-the-middle attacks, file injections, and malicious execution of commands causing out of bound memory conditions leading to other attacks.
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Analysis
by VulDB Data Team • 04/24/2017
The vulnerability identified as CVE-2017-2321 affects Juniper Networks NorthStar Controller Application, a critical network management platform used by telecommunications providers and enterprises for orchestrating and managing complex network infrastructures. This vulnerability represents a significant security weakness that existed in versions prior to 2.1.0 Service Pack 1, creating a substantial risk for organizations relying on this controller for their network operations. The NorthStar Controller serves as a central management point for network services and configurations, making it an attractive target for malicious actors seeking to compromise network infrastructure. The vulnerability's impact extends beyond simple service disruption, as it provides attackers with multiple attack vectors that can lead to comprehensive system compromise and data exposure.
The technical flaw manifests through multiple attack vectors that exploit weaknesses in the application's input validation and memory management mechanisms. Attackers can leverage man-in-the-middle techniques to intercept and manipulate network communications, while file injection vulnerabilities allow for unauthorized modification of system files and configurations. The out-of-bounds memory conditions mentioned in the vulnerability description indicate serious memory corruption issues that can result in arbitrary code execution or system crashes. These memory-related vulnerabilities are classified under CWE-121 as heap-based buffer overflow conditions, where insufficient bounds checking allows attackers to write beyond allocated memory regions. The vulnerability's design permits unauthenticated access, meaning that any network-based attacker with access to the controller's network interface can exploit these weaknesses without requiring valid credentials or elevated privileges.
The operational impact of CVE-2017-2321 is severe and multifaceted, potentially leading to complete system compromise and service disruption across affected networks. The vulnerability enables attackers to achieve partial to full denial of service conditions, which can result in network outages and service interruptions that directly impact business operations and customer satisfaction. System state modification capabilities allow attackers to alter network configurations, potentially redirecting traffic or disabling critical network functions. The potential for sensitive information disclosure creates additional risks, as attackers could access network credentials, configuration details, or other proprietary data that could facilitate further attacks. These conditions align with ATT&CK technique T1059 for command and scripting interpreter and T1005 for data from local system, where attackers can execute commands and extract information from compromised systems. The vulnerability's ability to support multiple attack vectors means that a single exploitation attempt could lead to cascading security incidents throughout the network infrastructure.
Organizations must implement immediate mitigations to protect against CVE-2017-2321 exploitation, beginning with the mandatory upgrade to Juniper Networks NorthStar Controller version 2.1.0 Service Pack 1 or later. Network segmentation and access control measures should be implemented to limit network-based access to the controller application, reducing the attack surface for potential exploitation attempts. Regular security monitoring and log analysis should be enhanced to detect anomalous network behavior that might indicate exploitation attempts. The vulnerability's characteristics align with ATT&CK technique T1190 for exploit for client execution, where attackers leverage application vulnerabilities to execute malicious code. Organizations should also implement network intrusion detection systems capable of identifying man-in-the-middle attack patterns and file injection attempts. Security teams should conduct comprehensive vulnerability assessments of their network infrastructure to identify any other systems that might be vulnerable to similar attack vectors, particularly those using older versions of Juniper's NorthStar Controller or related applications. The remediation process should include thorough testing of the updated software to ensure that the security patches do not introduce compatibility issues with existing network configurations and services.