CVE-2021-1651 in Windows
Summary
by MITRE • 01/13/2021
Diagnostics Hub Standard Collector Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-1680.
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Analysis
by VulDB Data Team • 10/09/2024
The Diagnostics Hub Standard Collector Elevation of Privilege Vulnerability represents a critical security flaw within Microsoft Windows operating systems that allows unprivileged users to escalate their privileges to system level access. This vulnerability specifically affects the Diagnostics Hub Standard Collector service component which is designed to collect diagnostic information from Windows systems for troubleshooting purposes. The flaw exists in how the service handles privilege checks during its operation, creating an opportunity for malicious actors to exploit the system's security model. The vulnerability is particularly concerning because it operates at the kernel level where the service runs with elevated privileges, making it a prime target for privilege escalation attacks. Security researchers have identified that this vulnerability can be leveraged by local attackers who already have user-level access to a target system to gain full administrative control.
The technical implementation of this vulnerability stems from improper privilege validation within the Diagnostics Hub Standard Collector service. When the service processes certain diagnostic commands or data inputs, it fails to properly verify the privileges of the calling process before executing privileged operations. This weakness allows an attacker to craft malicious input that triggers the service to perform actions that should only be available to administrators. The flaw is categorized under CWE-276 which specifically addresses improper privileges, and aligns with ATT&CK technique T1068 which covers 'Exploitation for Privilege Escalation'. The vulnerability manifests when the service processes untrusted input without adequate validation, potentially leading to arbitrary code execution with system-level privileges. The attack vector typically involves an attacker running a malicious application that interacts with the vulnerable service through legitimate diagnostic interfaces, bypassing normal access controls that would normally prevent privilege escalation.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete control over affected systems. Once successfully exploited, adversaries can install malware, modify system files, create new user accounts, and access sensitive data without detection. The vulnerability affects multiple versions of Windows including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern for enterprise environments. Organizations with multiple systems running affected versions face significant risk as a single compromised endpoint could provide attackers with a foothold to move laterally across networks. The vulnerability's exploitation requires minimal privileges and can be automated, making it particularly dangerous in environments where user accounts have broader access than necessary. Security monitoring systems may not immediately detect exploitation attempts as the malicious activity occurs through legitimate system interfaces, potentially allowing attackers to maintain persistence undetected.
Mitigation strategies for this vulnerability should focus on immediate patch deployment and system hardening measures. Microsoft released security updates that address this specific flaw through proper privilege validation in the Diagnostics Hub Standard Collector service. Organizations should prioritize patch management processes to ensure all affected systems receive the necessary updates. Additionally, implementing least privilege principles can significantly reduce the impact of exploitation attempts by limiting user access rights and reducing the attack surface. Network segmentation and monitoring solutions should be enhanced to detect unusual diagnostic service activity that might indicate exploitation attempts. System administrators should also consider disabling unnecessary diagnostic services when they are not actively being used for troubleshooting purposes. The vulnerability serves as a reminder of the importance of proper privilege separation and input validation in system services, particularly those that operate with elevated privileges and handle external inputs. Security teams should conduct regular vulnerability assessments to identify similar privilege escalation opportunities in other system components and maintain updated threat intelligence to detect potential exploitation attempts.