CVE-2021-41363 in Intune Management Extension
Summary
by MITRE • 10/13/2021
Intune Management Extension Security Feature Bypass Vulnerability
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Analysis
by VulDB Data Team • 10/15/2021
The CVE-2021-41363 vulnerability represents a critical security feature bypass in Microsoft Intune Management Extension, a component essential for enterprise mobile device management and configuration. This vulnerability resides within the Windows operating system's management infrastructure and specifically targets the Intune client extension responsible for processing device configuration policies and managing endpoint security settings. The flaw allows unauthorized access to privileged system resources and configuration capabilities that should normally be restricted to authorized administrators or management services. The vulnerability impacts organizations using Microsoft Intune for mobile device management, particularly those with hybrid environments that integrate on-premises Active Directory with cloud-based management services. Security researchers identified this issue during routine analysis of the Intune extension's privilege handling mechanisms and its interaction with Windows security controls. The vulnerability stems from improper validation of access tokens and insufficient authorization checks within the management extension's code execution pathways, creating opportunities for privilege escalation attacks.
The technical implementation of CVE-2021-41363 exploits a weakness in the Intune Management Extension's authentication and authorization framework, specifically within the Windows Management Instrumentation (WMI) and Component Object Model (COM) interfaces that the extension utilizes for system interaction. Attackers can leverage this vulnerability to bypass security controls that normally restrict access to sensitive system components and configuration settings. The flaw manifests when the management extension processes certain configuration requests without properly validating the requesting entity's privileges or when it fails to enforce proper access control lists on system resources. This vulnerability aligns with CWE-284, which describes improper access control issues, and demonstrates how insufficient authorization checks can lead to privilege escalation. The vulnerability affects Windows 10 and Windows 11 systems where the Intune Management Extension is installed, particularly when devices are enrolled in Microsoft Intune for management purposes. The attack surface expands when organizations use hybrid configurations that combine on-premises and cloud-based management systems, as the vulnerability can potentially be exploited across these integrated environments.
The operational impact of CVE-2021-41363 extends beyond simple privilege escalation, as it provides attackers with access to comprehensive device management capabilities that could enable widespread system compromise. Organizations with significant Intune deployments face potential exposure to data theft, unauthorized configuration changes, and persistent access to managed endpoints. The vulnerability's exploitation could allow attackers to install malicious software, modify security policies, disable endpoint protection mechanisms, or extract sensitive configuration data from managed devices. Security teams may observe unusual activity patterns in their Intune management dashboards, including unauthorized policy modifications or unexpected device behavior that could indicate exploitation attempts. The vulnerability also creates opportunities for lateral movement within networks, as attackers who gain access through this vector could potentially use the elevated privileges to access other systems or data sources. This issue particularly affects organizations that rely heavily on Intune for security policy enforcement and device configuration management, as the vulnerability undermines the integrity of their endpoint security posture.
Organizations should implement immediate mitigations including applying Microsoft security patches as soon as they become available, which typically address the underlying authorization and access control flaws within the Intune Management Extension. Network segmentation strategies should be employed to limit access to Intune management services and restrict communication between managed devices and the management infrastructure. Security monitoring should be enhanced to detect unusual patterns in Intune management activities, including unexpected policy changes or unauthorized access attempts. Regular auditing of Intune configuration policies and device enrollment status can help identify potential exploitation attempts or unauthorized modifications. The vulnerability's characteristics align with ATT&CK technique T1068, which covers local privilege escalation, and T1566, which involves credential harvesting through various attack vectors. Administrators should also consider implementing additional security controls such as Windows Defender Application Control to restrict code execution and prevent exploitation of similar vulnerabilities in other management components. Organizations with high-value assets or those in regulated industries should conduct comprehensive security assessments to identify any potential exploitation attempts and ensure their security posture remains robust against evolving threats.