Race Condition in Windows Clipboard User Service

Executive Summary

This is a race condition vulnerability in the Windows Clipboard User Service. It occurs when improper synchronization allows concurrent execution of processes sharing a resource. An authorized attacker can exploit this to elevate their privileges locally on affected systems.

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Detection Guidance

Detecting this race condition vulnerability requires monitoring the Windows Clipboard User Service for unusual privilege escalation patterns. Check Windows Event Logs for Event ID 4624 (successful logons) and Event ID 4672 (special privileges assigned). Use PowerShell commands like Get-WinEvent -LogName Security | Where-Object {$_.Id -eq 4624 -or $_.Id -eq 4672} to filter relevant events. Monitor service status with sc query ClipSVC and check for unexpected service restarts.

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Impact Analysis

An attacker with local access could exploit this to gain higher privileges on your system. This might allow them to install programs, view or delete data, or create new accounts with full user rights. Systems running vulnerable Windows versions are at risk.

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Mitigation Strategies

Apply the latest Windows security updates immediately through Windows Update or WSUS. Disable the Clipboard User Service temporarily if not critical using services.msc or sc stop ClipSVC. Restrict local user permissions to prevent unauthorized service modifications. Monitor Microsoft's advisory page for additional guidance.

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