CVE-2019-4261 in WebSphere MQ
Summary
by MITRE
IBM WebSphere MQ V7.1, 7.5, IBM MQ V8, IBM MQ V9.0LTS, IBM MQ V9.1 LTS, and IBM MQ V9.1 CD are vulnerable to a denial of service attack caused by specially crafted messages. IBM X-Force ID: 160013.
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Analysis
by VulDB Data Team • 11/20/2023
IBM WebSphere MQ versions 7.1, 7.5, IBM MQ V8, IBM MQ V9.0LTS, IBM MQ V9.1 LTS, and IBM MQ V9.1 CD contain a denial of service vulnerability that can be exploited through specially crafted messages. This vulnerability represents a critical flaw in the message queuing system's message processing logic where malformed or specially constructed messages can cause the messaging queue to crash or become unresponsive. The flaw occurs during the message parsing and validation phases when the system encounters unexpected message structures or data formats that it cannot properly handle, leading to system instability and potential complete service disruption.
The technical nature of this vulnerability aligns with CWE-400, which describes unchecked resource consumption, and specifically relates to improper input validation within the messaging infrastructure. Attackers can craft messages with malformed headers, incorrect data lengths, or unexpected binary sequences that trigger buffer overflows or memory corruption conditions within the IBM MQ processing components. The vulnerability exists because the system does not adequately validate message content before processing, allowing maliciously constructed payloads to bypass normal input sanitization mechanisms and cause the underlying messaging engine to fail.
The operational impact of this vulnerability is severe as it can result in complete denial of service for the affected messaging system, potentially disrupting critical business processes that depend on message queuing for communication between applications. When exploited, the vulnerability can cause the IBM MQ service to crash repeatedly, requiring manual intervention for restart and potentially leading to data loss or message queue corruption. Organizations relying on these messaging systems for enterprise application integration, financial transactions, or other mission-critical operations face significant risk of service interruption and potential business disruption.
Mitigation strategies should include immediate application of IBM's security patches and fixes released for the affected versions, along with implementing message filtering and validation at network boundaries to prevent malformed messages from reaching the MQ servers. Network segmentation and access controls should be strengthened to limit exposure, while monitoring systems should be enhanced to detect unusual patterns in message processing that might indicate exploitation attempts. Organizations should also consider implementing message queuing firewalls or proxy services that can sanitize incoming messages before they reach the core MQ infrastructure, following ATT&CK technique T1499.004 for network disruption and T1070.004 for indicator removal to prevent exploitation. The vulnerability demonstrates the importance of robust input validation and proper error handling in enterprise messaging systems, with implications for the broader cybersecurity community regarding message queue security and resilient system design.