CVE-2022-41073: Windows 10 1507 Privilege Escalation Flaw

CVE-2022-41073 Overview

CVE-2022-41073 is a Windows Print Spooler Elevation of Privilege Vulnerability that allows a local attacker with low-level privileges to escalate to SYSTEM-level access on affected Windows systems. This vulnerability affects the Windows Print Spooler service, a component that has been repeatedly targeted due to its privileged execution context and complex interaction with user-supplied data.

Critical Impact

This vulnerability is actively exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog. Successful exploitation allows attackers to gain SYSTEM privileges on affected Windows systems, enabling complete system compromise.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 20H2, 21H1, 21H2, 22H2)
• Microsoft Windows 11 (versions 21H2, 22H2)
• Microsoft Windows 7 SP1, Windows 8.1
• Microsoft Windows Server 2008, 2008 R2, 2012, 2012 R2, 2016, 2019, 2022

Discovery Timeline

• 2022-11-09 - CVE-2022-41073 published to NVD
• 2025-10-30 - Last updated in NVD database

Technical Details for CVE-2022-41073

Vulnerability Analysis

This vulnerability resides in the Windows Print Spooler service (spoolsv.exe), which runs with SYSTEM privileges. The flaw is classified as CWE-787 (Out-of-Bounds Write), indicating that the vulnerability allows an attacker to write data outside the bounds of an allocated memory buffer. When exploited, this memory corruption can be leveraged to achieve arbitrary code execution in the context of the SYSTEM account.

The Windows Print Spooler has historically been a high-value target for attackers due to its elevated privileges and exposure through both local and network interfaces. This vulnerability continues the trend of critical Print Spooler flaws, following notable vulnerabilities like PrintNightmare (CVE-2021-34527).

Root Cause

The vulnerability stems from an out-of-bounds write condition (CWE-787) in the Windows Print Spooler service. Improper bounds checking when processing certain data allows an attacker to corrupt memory in a controlled manner. The lack of adequate input validation permits writing beyond allocated buffer boundaries, ultimately enabling privilege escalation from a low-privileged user to SYSTEM.

Attack Vector

Exploitation requires local access to the target system with low-level user privileges. The attacker does not need user interaction to trigger the vulnerability. The attack flow typically involves:

1. An attacker with a standard user account accesses the local system
2. The attacker triggers the vulnerable code path in the Print Spooler service
3. Carefully crafted input causes an out-of-bounds write in memory
4. The memory corruption is leveraged to hijack execution flow
5. Attacker achieves arbitrary code execution as SYSTEM

The local attack vector with low complexity and no required user interaction makes this vulnerability particularly dangerous in environments where users have local access, such as corporate workstations or terminal servers.

Detection Methods for CVE-2022-41073

Indicators of Compromise

• Unusual process creation events from spoolsv.exe, particularly spawning command shells or other suspicious child processes
• Memory access violations or crashes in the Print Spooler service that may indicate exploitation attempts
• Unexpected privilege escalation events where standard users suddenly gain SYSTEM-level access
• Presence of known exploit payloads or tools associated with Windows Print Spooler privilege escalation

Detection Strategies

• Monitor Windows Event Logs for Print Spooler service crashes (Event ID 7031, 7034) and suspicious restart patterns
• Implement endpoint detection rules to identify anomalous behavior from spoolsv.exe, including unusual child process creation or file system access
• Deploy behavioral detection for privilege escalation patterns, specifically monitoring for low-privilege processes suddenly gaining SYSTEM tokens
• Use SentinelOne's Storyline feature to correlate Print Spooler activity with subsequent suspicious actions

Monitoring Recommendations

• Enable detailed Windows Security auditing for process creation events (Event ID 4688) with command line logging
• Configure alerts for any processes spawned by spoolsv.exe that are not typical printer-related executables
• Monitor for file creation in sensitive directories by the Print Spooler process
• Review printer driver installations and updates for unauthorized changes

How to Mitigate CVE-2022-41073

Immediate Actions Required

• Apply Microsoft's November 2022 security updates immediately on all affected Windows systems
• Disable the Print Spooler service on systems where printing functionality is not required, especially domain controllers and critical servers
• Implement network segmentation to limit lateral movement potential if exploitation occurs
• Deploy endpoint detection and response (EDR) solutions like SentinelOne to detect and block exploitation attempts

Patch Information

Microsoft released security patches for this vulnerability as part of the November 2022 Patch Tuesday updates. Administrators should consult the Microsoft Security Response Center advisory for specific KB articles applicable to each affected Windows version. The patches are available through Windows Update, WSUS, and the Microsoft Update Catalog.

Given this vulnerability's inclusion in CISA's Known Exploited Vulnerabilities catalog, federal agencies were required to remediate by the mandated deadline, and all organizations should treat patching as urgent.

Workarounds

• Disable the Print Spooler service on systems where printing is not required using Stop-Service -Name Spooler -Force; Set-Service -Name Spooler -StartupType Disabled
• Restrict inbound connections to the Print Spooler service using Windows Firewall rules to limit exposure
• Apply the principle of least privilege to minimize the number of users with local access to systems
• Consider using Group Policy to disable Point and Print restrictions while maintaining Print Spooler functionality where absolutely required

# Disable Print Spooler service via PowerShell
Stop-Service -Name Spooler -Force
Set-Service -Name Spooler -StartupType Disabled

# Verify service status
Get-Service -Name Spooler | Select-Object Name, Status, StartType