Windows User Profile Service Elevation of Privilege Vulnerability (CVE-2022-26904) Analysis and Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTMost Windows operating system versions, including Windows 10, 11, and Windows Server 2008 through 2022
A locally authenticated attacker can exploit a race condition to execute arbitrary code with SYSTEM privileges, leading to complete system compromise
Immediately apply the official Microsoft cumulative security updates and restrict multi-user interactive logins on unpatched systems
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
To remediate this vulnerability, apply the latest cumulative security updates provided by Microsoft. You can force Windows Update via PowerShell as follows:
# Install Windows Update module and trigger updates
Install-Module PSWindowsUpdate -Force -Verbose
Get-WindowsUpdate -AcceptAll -Install -AutoReboot2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, mitigate the risk by disabling Remote Desktop Services (RDS) and auditing local interactive login rights to prevent unauthorized local access:
# Stop and disable Remote Desktop Services (RDP)
Stop-Service -Name 'TermService' -Force
Set-Service -Name 'TermService' -StartupType Disabled
# Disable unnecessary local accounts (e.g., Guest)
Disable-LocalUser -Name 'Guest'3. Log Audit & IoC Verification Commands
Verify the version of the User Profile Service binary and inspect the Windows Event Logs for anomalous profile creation activities:
# Check the file version of profsvc.dll
Get-ItemProperty -Path 'C:\Windows\System32\profsvc.dll' | Select-Object -ExpandProperty VersionInfo | Format-List
# Query Event Logs for User Profile Service warnings or errors
Get-WinEvent -FilterHashtable @{LogName='Application'; ProviderName='Microsoft-Windows-User Profiles Service'; Level=1,2,3} -MaxEvents 50 | Format-Table TimeCreated, Id, Message -AutoSizeBlock Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2022-26904) is an elevation of privilege (LPE) vulnerability in the Windows User Profile Service (ProfSvc). ProfSvc is responsible for loading and unloading user profiles during login/logout sequences. The root cause lies in a race condition (CWE-362) during the creation and initialization of temporary user profile directories, where the service fails to properly validate file system junctions and symbolic links.
2. Exploitation Mechanics & Attack Scenario
An attacker with low-privileged local access executes a malicious process designed to trigger the creation of a new user profile by ProfSvc. During the brief window between directory creation and permission assignment (Time-of-Check to Time-of-Use), the attacker replaces the target directory with a symbolic link pointing to a critical system file (e.g., a DLL or executable in SYSTEM32). ProfSvc, running under high-privileged SYSTEM context, then inadvertently modifies permissions or overwrites the target file, allowing the attacker to hijack execution flow and gain SYSTEM privileges.
3. Infrastructure & Business Impact
As a vulnerability listed in the CISA KEV catalog, CVE-2022-26904 has been actively exploited in the wild. In an enterprise Active Directory environment, this vulnerability serves as a highly reliable lateral movement and privilege escalation vector. Once an attacker gains initial access via phishing or credential stuffing, they can leverage this exploit to compromise domain controllers or critical application servers, leading to full domain takeover.
Official Vendor Advisories & References
Windows User Profile Service Elevation of Privilege Vulnerability
Frequently Asked SecOps Questions (CVE-2022-26904)
FAQQ1. How critical is CVE-2022-26904 and is it actively exploited in the wild?
CVE-2022-26904 is rated CVSS 7.0 (HIGH) with a 30-day EPSS exploitation probability of 17.0%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2022-26904?
Primary impacted vendors include microsoft across windows, windows_server. Scope summary: Windows 10, Windows 11, and Windows Server 2012/2016/2019/2022. Exploitable by any local user with standard privileges.
Q3. What temporary mitigations or workarounds exist for CVE-2022-26904 before patching?
[Mitigation] Immediately apply the official Microsoft cumulative security updates and restrict multi-user interactive logins on unpatched systems Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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