CVE-2020-1391 in Windows
Summary
by MITRE
An information disclosure vulnerability exists when the Windows Agent Activation Runtime (AarSvc) fails to properly handle objects in memory, aka 'Windows Agent Activation Runtime Information Disclosure Vulnerability'.
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Analysis
by VulDB Data Team • 10/30/2020
The Windows Agent Activation Runtime information disclosure vulnerability represents a critical security flaw within the Windows operating system's agent activation infrastructure. This vulnerability specifically affects the AarSvc component responsible for managing Windows Agent Activation Runtime services, which are essential for various system operations including Windows Update services, Windows Management Instrumentation, and other background processes. The flaw stems from improper memory handling mechanisms that allow unauthorized access to sensitive system information through the Windows Agent Activation Runtime service. The vulnerability manifests when the service processes memory objects without adequate validation or sanitization, creating potential pathways for information disclosure attacks that could expose system internals to malicious actors.
The technical implementation of this vulnerability resides in the memory management routines of the Windows Agent Activation Runtime service, which operates under the Windows operating system's core infrastructure. When the service encounters certain memory objects during normal operation, it fails to properly validate or sanitize the data structures before processing them, leading to potential information leakage through memory exposure. This memory handling failure creates a condition where attackers could potentially access memory segments containing sensitive data, configuration information, or system state details that should remain protected within the service's operational boundaries. The vulnerability falls under the category of improper handling of memory objects and can be categorized as a CWE-200 Information Exposure vulnerability, specifically related to insufficient input validation and memory management practices. The flaw is particularly concerning because it operates at a system level where the service has elevated privileges and access to critical system resources.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates potential attack vectors for more sophisticated exploitation techniques. An attacker who successfully exploits this vulnerability could gain access to system configuration details, service information, and potentially sensitive operational data that could be leveraged for further attacks. The Windows Agent Activation Runtime service is designed to run with elevated privileges, making this information disclosure particularly dangerous as it could provide attackers with insights into system internals that would normally be restricted. This vulnerability could enable attackers to map system services, understand service dependencies, and potentially identify other system components that could be targeted for privilege escalation or lateral movement within the network. The impact is consistent with ATT&CK technique T1082 System Information Discovery and T1007 System Service Discovery, as attackers could use the leaked information to better understand the target system's operational environment.
Mitigation strategies for this vulnerability should focus on immediate patch deployment through Microsoft's security updates, as the flaw requires a system-level fix from the vendor. Organizations should prioritize applying the relevant Windows security updates that address the memory handling issues within the AarSvc component, ensuring that all affected systems receive the necessary patches to remediate the vulnerability. Additionally, network segmentation and privilege separation measures should be implemented to limit the potential impact if exploitation were to occur, as the service's elevated privileges make it a valuable target for attackers seeking to escalate their access. System monitoring should be enhanced to detect unusual patterns of memory access or service behavior that might indicate exploitation attempts, particularly focusing on the Windows Agent Activation Runtime service and related Windows management services. Security teams should also consider implementing access controls and service restrictions that limit the exposure of the vulnerable service to external networks, as the vulnerability could potentially be exploited remotely through various attack vectors targeting the Windows Agent Activation Runtime infrastructure.