CVE-2016-8986 in WebSphere MQ
Summary
by MITRE
IBM WebSphere MQ 8.0 could allow an authenticated user with access to the queue manager to bring down MQ channels using specially crafted HTTP requests. IBM Reference #: 1998648.
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Analysis
by VulDB Data Team • 08/16/2020
IBM WebSphere MQ version 8.0 contains a vulnerability that enables authenticated users with queue manager access to disrupt messaging channels through carefully constructed HTTP requests. This flaw represents a denial of service condition that can severely impact mission-critical messaging infrastructure. The vulnerability stems from insufficient input validation within the HTTP channel handling mechanisms of the messaging queue manager. When maliciously formatted HTTP requests are processed by the affected system, they trigger unexpected behavior in the channel management subsystem, leading to channel termination and service disruption. The attack requires an authenticated user who already possesses access credentials to the queue manager, making this a privilege escalation type vulnerability rather than a remote code execution flaw. However, the impact remains significant as it allows attackers to selectively disable messaging channels without requiring administrative privileges.
The technical implementation of this vulnerability involves the manipulation of HTTP headers and request parameters that are processed by the WebSphere MQ HTTP channel listener. When the queue manager processes these malformed requests, the internal state management routines fail to properly handle the unexpected input, resulting in channel shutdown operations. This behavior aligns with CWE-129 Input Validation and CWE-20 Improper Input Validation categories from the Common Weakness Enumeration catalog. The vulnerability specifically affects the HTTP channel implementation within IBM WebSphere MQ 8.0, where the system fails to properly sanitize incoming HTTP request data before processing. The flaw demonstrates poor error handling within the messaging channel subsystem, where malformed input causes cascading failures that terminate active channels.
From an operational perspective, this vulnerability poses a substantial risk to organizations relying on IBM WebSphere MQ for critical business communications. The ability to selectively disable messaging channels can disrupt data flow between applications, potentially causing cascading failures throughout enterprise systems. Attackers can exploit this vulnerability to create service interruptions that may last until manual intervention occurs or the queue manager is restarted. The impact extends beyond simple service disruption as it can affect business continuity, particularly in environments where real-time messaging is essential for operational processes. The vulnerability also represents a potential vector for more sophisticated attacks, as initial disruption can be followed by additional exploitation attempts. Organizations using this messaging platform face increased risk of operational downtime and potential data synchronization issues when channels are terminated.
The recommended mitigation strategies include applying the relevant IBM security patches and fixes that address the HTTP request handling within the queue manager. Organizations should also implement network segmentation and access controls to limit the scope of potential exploitation by authenticated users. Monitoring and logging of HTTP channel activities can help detect anomalous request patterns that may indicate exploitation attempts. Additionally, implementing proper input validation at the network perimeter and within the messaging infrastructure can provide additional defense layers. Organizations should consider disabling unnecessary HTTP channels where possible and ensure that only authorized users have access to queue manager administrative functions. The vulnerability demonstrates the importance of robust input validation and proper error handling in enterprise messaging systems, aligning with ATT&CK technique T1499.002 for network denial of service attacks. Regular security assessments and vulnerability scanning should be conducted to identify similar issues within the broader messaging infrastructure ecosystem.