CVE-2019-4560 in IBM
Summary
by MITRE
IBM MQ and IBM MQ Appliance 9.1 CD, 9.1 LTS, 9.0 LTS, and 8.0 is vulnerable to a denial of service attack caused by channels processing poorly formatted messages. IBM X-Force ID: 166357.
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Analysis
by VulDB Data Team • 03/12/2024
IBM MQ and IBM MQ Appliance versions 9.1 CD, 9.1 LTS, 9.0 LTS, and 8.0 contain a vulnerability that allows for denial of service attacks through improper handling of malformed messages within channel processing. This weakness stems from insufficient input validation mechanisms that fail to properly sanitize or reject messages containing malformed data structures or unexpected formatting patterns. The vulnerability manifests when channels attempt to process messages that do not conform to expected protocol specifications or contain invalid data sequences, leading to system instability and potential service interruption. The flaw exists in the message processing pipeline where the system does not adequately validate message headers, body content, or encoding formats before attempting to parse or route the data through the messaging infrastructure.
The technical implementation of this vulnerability involves the channel processing logic failing to implement proper exception handling and input sanitization routines when encountering malformed message structures. When a specially crafted message is sent to a channel, the processing routine may encounter unexpected data patterns that cause the channel to enter an unstable state or crash entirely. This behavior aligns with common software security principles where insufficient validation of external inputs leads to system instability, particularly in messaging systems that handle high volumes of data from diverse sources. The vulnerability represents a classic case of inadequate error handling and input validation that can be exploited by attackers to disrupt service availability.
The operational impact of this vulnerability extends beyond simple service interruption to potentially compromise the overall reliability and availability of messaging infrastructure. Organizations relying on IBM MQ for critical business processes may experience significant disruption when channels become unresponsive due to malformed message processing. The denial of service condition can affect multiple channels simultaneously if the malformed message pattern is designed to trigger widespread processing failures. This vulnerability particularly impacts systems where message integrity cannot be guaranteed, such as those receiving untrusted inputs from external partners or public networks. The attack vector is relatively straightforward as it only requires sending a malformed message to any active channel, making it accessible to attackers with minimal technical expertise.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation mechanisms and robust error handling procedures within the messaging infrastructure. Organizations should consider applying the vendor-provided security patches and updates that address the specific message processing flaws in the affected versions. Network-level controls such as message filtering and validation rules can help prevent malformed messages from reaching vulnerable channels. Additionally, implementing monitoring and alerting systems that detect unusual channel behavior or processing errors can help identify exploitation attempts before they cause significant service disruption. The remediation approach should align with established cybersecurity frameworks and best practices for message queue security, including regular vulnerability assessments and security configuration reviews to prevent similar issues from emerging in future deployments. This vulnerability demonstrates the importance of proper input validation and error handling in distributed messaging systems, particularly those handling sensitive business data flows.