CVE-2024-20680 in Windows
Summary
by MITRE • 01/09/2024
Windows Message Queuing Client (MSMQC) Information Disclosure
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Analysis
by VulDB Data Team • 06/10/2025
The Windows Message Queuing Client vulnerability represents a critical information disclosure flaw that affects the messaging infrastructure of Microsoft Windows systems. This vulnerability resides within the MSMQ component responsible for handling message queuing operations and can be exploited to extract sensitive information from the system. The flaw specifically impacts how the client processes certain queue operations and handles error responses, creating potential exposure points for unauthorized information retrieval.
The technical implementation of this vulnerability stems from improper handling of queue access controls and insufficient validation of message content during processing operations. When a malicious actor crafts specific queue requests or exploits existing queue states, the system may inadvertently reveal internal queue structures, message metadata, or other sensitive operational details through error messages or response data. This occurs due to inadequate sanitization of output data and failure to properly enforce access controls at multiple layers of the messaging stack.
Operational impact assessment reveals that successful exploitation can lead to significant reconnaissance opportunities for attackers seeking to map queue configurations, identify message patterns, and potentially uncover system dependencies. The information disclosed through this vulnerability may include queue names, message timestamps, sender identifiers, and other operational parameters that could facilitate more sophisticated attacks. Organizations running MSMQ services face elevated risk of privilege escalation or targeted attacks once attackers have gained visibility into the messaging infrastructure.
Security professionals should implement immediate mitigations including applying Microsoft security patches and updates to address the root cause of the information disclosure. Network segmentation and access control enforcement can help limit exposure by restricting direct access to MSMQ client components. Additionally, monitoring for unusual queue access patterns and implementing proper logging of message queuing operations will aid in detecting potential exploitation attempts.
This vulnerability aligns with CWE-200 Information Exposure and follows attack patterns documented in the MITRE ATT&CK framework under T1082 System Information Discovery and T1592 Account Discovery. Organizations should consider this as part of a broader reconnaissance phase that could lead to more severe compromise opportunities, particularly when combined with other enumeration techniques targeting Windows messaging services.
The remediation approach requires comprehensive system hardening including disabling unnecessary MSMQ client functionality, implementing strict firewall rules, and establishing regular security assessments of messaging infrastructure components. System administrators should also review existing queue configurations and ensure proper access controls are enforced across all message queuing operations to prevent unauthorized information disclosure through this or similar channels.