CVE-2023-36574 in Windows
Summary
by MITRE • 10/25/2023
Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 03/01/2025
Microsoft Message Queuing msmq3.dll contains a remote code execution vulnerability that arises from improper validation of user-supplied data during the processing of specific message queue operations. This vulnerability specifically affects the way MSMQ handles certain serialized objects within message queues, creating a condition where maliciously crafted input can trigger arbitrary code execution on affected systems. The flaw exists in the deserialization logic of the messaging infrastructure, allowing attackers to inject malicious payloads that execute with the privileges of the MSMQ service account. This represents a critical security gap that directly violates the principle of least privilege and demonstrates poor input sanitization practices. The vulnerability has been classified under CWE-502 which specifically addresses deserialization of untrusted data as a primary weakness, making it particularly dangerous in enterprise environments where MSMQ is commonly deployed for inter-application communication. According to ATT&CK framework, this vulnerability maps to T1203 - Exploitation for Client Execution and T1059 - Command and Scripting Interpreter, as it enables attackers to execute arbitrary commands through the messaging queue infrastructure. The impact extends beyond simple code execution as it can be leveraged to establish persistent access, escalate privileges, and potentially move laterally within network segments where messaging services are deployed. Organizations running MSMQ services are particularly at risk since the vulnerability can be exploited remotely without requiring authentication, making it a prime target for automated exploitation campaigns.
The technical exploitation of this vulnerability requires an attacker to send specially crafted messages to a target MSMQ server, where the malicious payload is processed during normal queue operations. The vulnerability affects multiple versions of Windows Server and Windows 10/11 systems that have MSMQ components installed, with the attack surface expanding to include any system that communicates with vulnerable message queues. The flaw is particularly concerning because MSMQ is often deployed in mission-critical enterprise applications where message reliability and security are paramount. Attackers can leverage this vulnerability to execute code with elevated privileges, potentially gaining access to sensitive enterprise data or establishing backdoors for continued access. The exploitation process typically involves crafting malicious serialized objects that, when processed by the vulnerable msmq3.dll component, trigger the execution of arbitrary code. This attack vector represents a sophisticated technique that bypasses traditional network security controls since it operates through legitimate messaging protocols. The vulnerability's presence in core Windows messaging infrastructure means that standard endpoint protection solutions may not detect the malicious activity until after the code has been executed, creating a window of opportunity for attackers to establish persistence. Security researchers have noted that the vulnerability's exploitation requires minimal privileges to initiate the attack, making it particularly dangerous in environments where message queues are accessible to untrusted users or applications.
Organizations affected by this vulnerability face significant operational risks including potential data breaches, system compromise, and service disruption. The remote execution capability means that attackers can exploit the vulnerability from outside the corporate network, making traditional perimeter-based security measures ineffective. The impact is compounded by the fact that MSMQ is often used in distributed enterprise applications, meaning a single compromised queue server can potentially affect multiple downstream systems. Recovery from exploitation typically involves system restoration from clean backups, which may result in significant downtime and data loss. The vulnerability also creates opportunities for attackers to establish persistent access through the messaging infrastructure, making long-term monitoring and remediation necessary. Organizations should consider the broader implications of this vulnerability on their overall security posture, as it may indicate other potential weaknesses in their messaging and communication infrastructure. The exploitability of this vulnerability has been confirmed in various enterprise environments, particularly those with legacy systems that have not been updated to address the flaw. Security teams must also account for the potential for this vulnerability to be used in conjunction with other attack techniques, creating more complex and difficult-to-detect threats. The remediation process requires careful planning to ensure that MSMQ services can be updated without disrupting critical business applications that depend on message queue functionality. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates the risks associated with running outdated messaging infrastructure components. Additionally, the attack surface is expanded by the fact that many organizations use MSMQ in cloud environments, where the vulnerability could be exploited to compromise cloud-based messaging services and potentially affect other cloud resources. The complexity of enterprise messaging architectures means that organizations must conduct thorough vulnerability assessments to identify all potentially affected systems and implement comprehensive mitigation strategies.