CVE-2020-4592 in MQ Appliance
Summary
by MITRE • 11/18/2020
IBM MQ Appliance 9.1.CD and LTS could allow an authenticated user, under nondefault configuration to cause a data corruption attack due to an error when using segmented messages.
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Analysis
by VulDB Data Team • 12/08/2020
The vulnerability identified as CVE-2020-4592 affects IBM MQ Appliance versions 9.1.CD and LTS, representing a critical data integrity issue that can be exploited by authenticated users. This flaw manifests specifically under nondefault configuration conditions, indicating that the vulnerability may not be immediately apparent in standard deployments but becomes exploitable when certain configuration parameters are altered. The root cause lies within the message handling mechanism of the appliance, particularly when processing segmented messages that are broken into multiple parts for transmission or storage.
The technical implementation of this vulnerability stems from inadequate error handling during segmented message processing within the IBM MQ Appliance infrastructure. When messages are segmented for transmission or storage, the system must properly manage the reconstruction process to maintain data integrity. The flaw occurs during this reconstruction phase, where the appliance fails to properly validate or handle the segmented components, potentially leading to data corruption. This type of vulnerability falls under CWE-129 Input Validation and OWASP Top Ten category A03: Injection, as it involves improper handling of message data that can be manipulated by authenticated users. The error condition specifically affects the message queuing and data recovery mechanisms, where corrupted segments can overwrite or corrupt existing data within the message queue system.
The operational impact of CVE-2020-4592 extends beyond simple data loss, potentially compromising the entire message queuing infrastructure of affected systems. An authenticated attacker with knowledge of the nondefault configuration can exploit this vulnerability to deliberately corrupt message data, which could lead to service disruption, data inconsistency, and potential system instability. The corruption can occur during message transmission, storage, or retrieval phases, making it particularly dangerous for mission-critical applications that rely on IBM MQ for enterprise messaging. This vulnerability directly impacts the availability and integrity of message queuing services, potentially affecting business continuity and data reliability. Organizations using IBM MQ Appliance in production environments face significant risk as this flaw could be leveraged to cause cascading failures in message processing workflows and potentially impact downstream systems that depend on the integrity of message data.
Mitigation strategies for CVE-2020-4592 should focus on both immediate remediation and long-term configuration hardening. Organizations should apply the official IBM security patches and updates released to address this vulnerability, ensuring that all affected IBM MQ Appliance systems are updated to patched versions. Configuration review processes should be implemented to identify and correct nondefault settings that may expose the system to this vulnerability, particularly focusing on message handling and segmentation parameters. Network segmentation and access controls should be strengthened to limit authenticated user access to critical message queuing functions, reducing the attack surface. Monitoring and logging mechanisms should be enhanced to detect anomalous message processing patterns that could indicate exploitation attempts, with particular attention to segmented message handling activities. Additionally, regular security assessments should be conducted to verify that the appliance configurations remain secure and that no unauthorized changes have been made to the system parameters that could expose the vulnerability. The remediation process should follow the ATT&CK framework's mitigation strategies for privilege escalation and data manipulation techniques, ensuring comprehensive protection against similar vulnerabilities in the message queuing infrastructure.