CVE-2016-9009 in WebSphere MQ
Summary
by MITRE
IBM WebSphere MQ 8.0 could allow an authenticated user with authority to create a cluster object to cause a denial of service to MQ clustering. IBM Reference #: 1998647.
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Analysis
by VulDB Data Team • 08/17/2020
IBM WebSphere MQ version 8.0 contains a vulnerability that enables authenticated users with specific privileges to induce a denial of service condition within MQ clustering mechanisms. This flaw specifically affects environments where cluster objects can be created by authenticated users, creating a potential vector for service disruption attacks. The vulnerability stems from inadequate validation of cluster object creation requests, allowing malicious actors with appropriate permissions to manipulate the clustering infrastructure in ways that compromise system availability.
The technical implementation of this vulnerability resides in the cluster management subsystem of WebSphere MQ 8.0 where cluster object creation operations lack proper input sanitization and validation checks. When an authenticated user with sufficient authority attempts to create cluster objects, the system fails to adequately validate the parameters provided during the creation process. This validation gap enables attackers to craft malformed cluster object requests that cause the clustering component to enter an inconsistent state, ultimately leading to service disruption. The flaw operates at the application layer and affects the system's ability to maintain cluster integrity and communication between queue managers. According to CWE classification, this vulnerability maps to CWE-20: Improper Input Validation, which encompasses issues where insufficient validation of input data leads to system instability or unexpected behavior. The vulnerability demonstrates characteristics of CWE-400: Uncontrolled Resource Consumption, as the malformed cluster object creation requests can cause excessive resource allocation or processing delays that impact overall system performance.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the entire MQ clustering environment. When exploited, the denial of service condition can affect multiple queue managers within the cluster, causing communication failures between distributed messaging components. This disruption can cascade through applications that depend on WebSphere MQ for message queuing and inter-application communication, leading to broader business continuity issues. The vulnerability is particularly concerning in high-availability environments where clustering is essential for system resilience and fault tolerance. Attackers with access to create cluster objects can systematically degrade service quality or completely disable clustering functionality, forcing administrators to perform manual intervention and potentially causing extended downtime. From an ATT&CK framework perspective, this vulnerability aligns with T1499.004: Endpoint Denial of Service, as it targets the availability of messaging endpoints through manipulation of cluster configuration objects. The attack can be executed with relatively low privileges compared to other denial of service vectors, making it a particularly attractive target for adversaries seeking to disrupt messaging infrastructure.
Mitigation strategies for this vulnerability should focus on restricting cluster object creation privileges to only essential administrative users while implementing robust input validation mechanisms. Organizations should consider implementing network segmentation to limit access to cluster management functions and deploy monitoring solutions to detect anomalous cluster object creation patterns. Applying the latest IBM security patches and updates is crucial for addressing the underlying validation flaws in the WebSphere MQ clustering implementation. Additionally, implementing proper access control measures through role-based permissions can help prevent unauthorized users from creating cluster objects that could trigger the denial of service condition. Security teams should also establish regular auditing procedures to monitor cluster object creation activities and maintain detailed logs for forensic analysis in case of exploitation attempts. The vulnerability underscores the importance of principle of least privilege in messaging infrastructure management and highlights the need for comprehensive security testing of cluster management functions in enterprise messaging systems.