CVE-2019-4614 in IBM
Summary
by MITRE
IBM MQ and IBM MQ Appliance 8.0 and 9.0 LTS client connecting to a Queue Manager could cause a SIGSEGV denial of service caused by converting an invalid message. IBM X-Force ID: 168639.
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Analysis
by VulDB Data Team • 03/27/2024
The vulnerability identified as CVE-2019-4614 affects IBM MQ and IBM MQ Appliance versions 8.0 and 9.0 LTS, representing a critical denial of service condition that manifests through a segmentation fault during message processing. This flaw occurs when client applications connect to a queue manager and attempt to process invalid messages, leading to a system crash that terminates the queue manager service. The issue stems from inadequate input validation mechanisms within the message handling subsystem, specifically during the conversion process of malformed message data structures.
The technical implementation of this vulnerability involves a buffer overflow condition that occurs when the IBM MQ client attempts to parse and convert invalid message formats received from external sources. The system's failure to properly validate message headers, payload structures, or encoding parameters creates an exploitable condition where maliciously crafted messages can trigger memory corruption. This memory corruption results in a SIGSEGV signal being generated, which terminates the queue manager process and disrupts all message queuing operations. The vulnerability is particularly concerning as it affects both client and server components of the IBM MQ ecosystem, potentially allowing attackers to cause widespread service disruption across enterprise messaging infrastructure.
From an operational impact perspective, this vulnerability represents a significant threat to business continuity and system availability, as IBM MQ serves as a critical component in enterprise messaging architectures. Organizations relying on this messaging platform for mission-critical applications face potential downtime that could span from minutes to hours depending on recovery procedures. The denial of service condition affects not only the immediate queue manager but can cascade through dependent systems that rely on message queuing for inter-application communication. The vulnerability's exploitation requires minimal privileges and can be executed remotely, making it particularly attractive to threat actors seeking to disrupt business operations. According to CWE classification, this vulnerability maps to CWE-125: Out-of-bounds Read, which specifically addresses memory access violations that can lead to system instability and denial of service conditions.
The attack surface for this vulnerability extends across multiple operational environments including distributed systems, cloud deployments, and hybrid architectures where IBM MQ components are integrated. The flaw is particularly dangerous in high-throughput environments where message volume is substantial, as a single malicious message can cause cascading failures. Security professionals should note that this vulnerability aligns with ATT&CK technique T1499.004: Endpoint Denial of Service, which describes methods for causing system unavailability through exploitation of software vulnerabilities. The IBM MQ appliance variant adds additional complexity as it represents a hardware-based solution that may require physical access or network-based exploitation depending on deployment architecture.
Organizations should implement immediate mitigations including applying the vendor-provided security patches, implementing message filtering mechanisms at network boundaries, and establishing monitoring protocols for unusual queue manager behavior. The recommended approach involves configuring message validation rules that reject malformed messages before they reach the queue manager processing layer. Network segmentation and access controls should be strengthened to limit exposure of IBM MQ components to untrusted networks. Additionally, system administrators should implement comprehensive logging and alerting for segmentation fault occurrences and queue manager restart events. The vulnerability highlights the importance of maintaining current security patches and implementing robust input validation across all messaging components within enterprise infrastructure.