CVE-2024-43583: Windows 10 1507 Privilege Escalation Flaw

CVE-2024-43583 Overview

CVE-2024-43583 is an elevation of privilege vulnerability affecting the Windows Logon (Winlogon) process in Microsoft Windows operating systems. Winlogon is a critical Windows component responsible for handling secure attention sequences, loading user profiles, and managing interactive logon sessions. This vulnerability allows an authenticated local attacker to escalate their privileges on the affected system, potentially gaining SYSTEM-level access.

The vulnerability is classified under CWE-250 (Execution with Unnecessary Privileges), indicating that the Winlogon process may execute certain operations with elevated privileges when it should not, creating an opportunity for privilege escalation.

Critical Impact

A local attacker with low-level privileges can exploit this vulnerability to gain complete control over the affected Windows system, compromising confidentiality, integrity, and availability of system resources.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
• Microsoft Windows 11 (versions 21H2, 22H2, 23H2, 24H2)
• Microsoft Windows Server 2008, 2012, 2016, 2019, 2022, and 2022 23H2

Discovery Timeline

• October 8, 2024 - CVE-2024-43583 published to NVD
• February 25, 2025 - Last updated in NVD database

Technical Details for CVE-2024-43583

Vulnerability Analysis

This elevation of privilege vulnerability exists in the Winlogon component of Windows, which operates as a trusted system process critical to the Windows security architecture. Winlogon runs with SYSTEM privileges and is responsible for handling the Secure Attention Sequence (Ctrl+Alt+Delete), managing user authentication, and coordinating with the Local Security Authority Subsystem Service (LSASS).

The vulnerability requires local access to the target system and a valid user account with low-level privileges. Once exploited, an attacker can elevate their privileges to gain complete control over the system, allowing them to install programs, view, change, or delete data, and create new accounts with full user rights.

The EPSS score of 5.482% places this vulnerability in the 89.93rd percentile, indicating a notably higher probability of exploitation compared to other vulnerabilities. Organizations should prioritize patching this vulnerability, especially on systems accessible to multiple users or in environments where insider threats are a concern.

Root Cause

The root cause is classified under CWE-250: Execution with Unnecessary Privileges. This indicates that the Winlogon process or an associated component performs certain operations with elevated privileges unnecessarily, allowing a lower-privileged user to leverage this behavior to gain higher privileges. The flaw may involve improper privilege management during specific logon-related operations or when processing certain inputs within the Winlogon execution context.

Attack Vector

The attack requires local access to the vulnerable system. An attacker must first gain initial access to the system with a low-privilege user account. From this position, the attacker can exploit the vulnerability in Winlogon to elevate their privileges. No user interaction is required beyond the attacker's own actions on the system.

The local attack vector means that remote exploitation is not directly possible; however, an attacker who has established remote access to a system through other means (such as phishing or exploitation of a separate vulnerability) could then use CVE-2024-43583 to escalate privileges locally.

A proof-of-concept for this vulnerability has been published on GitHub, which increases the risk of exploitation. Organizations should refer to the Microsoft Security Update Guide for detailed patch information.

Detection Methods for CVE-2024-43583

Indicators of Compromise

• Unexpected processes spawned as child processes of winlogon.exe with SYSTEM privileges
• Anomalous behavior in the Winlogon process including unusual memory access patterns
• Authentication log entries showing privilege escalation following standard user logon events
• Suspicious DLL loading activity associated with the Winlogon process

Detection Strategies

• Monitor Windows Security Event Logs for Event ID 4672 (Special privileges assigned to new logon) following standard user authentication
• Implement process monitoring to detect unusual child processes spawned by winlogon.exe
• Deploy endpoint detection and response (EDR) solutions to identify privilege escalation attempts targeting Winlogon
• Use Windows Defender Credential Guard where available to provide additional protection for authentication processes

Monitoring Recommendations

• Enable Windows Security Event logging with detailed process creation tracking (Event ID 4688 with command line logging)
• Configure alerts for unexpected SYSTEM-level process creation by standard user sessions
• Monitor for modifications to Winlogon-related registry keys under HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
• Implement file integrity monitoring for Winlogon-associated system files and DLLs

How to Mitigate CVE-2024-43583

Immediate Actions Required

• Apply the latest Microsoft security updates from the October 2024 Patch Tuesday release immediately
• Prioritize patching for multi-user systems, domain controllers, and systems with elevated attack surface exposure
• Review and restrict local user accounts to minimize the number of users who could potentially exploit this vulnerability
• Enable Windows Defender Credential Guard on compatible systems to provide additional isolation for authentication processes

Patch Information

Microsoft has released security updates addressing this vulnerability as part of their October 2024 security update cycle. Detailed patch information is available through the Microsoft Security Update Guide for CVE-2024-43583. Organizations should apply the appropriate update for their Windows version immediately.

For Windows Server systems, ensure that both monthly rollup and security-only update options are evaluated based on your patching strategy. Server Core installations are also affected and require patching.

Workarounds

• Limit local logon privileges to only authorized users through Group Policy
• Implement application control policies to restrict unauthorized executable execution
• Enable Windows Defender Exploit Guard with Attack Surface Reduction rules targeting privilege escalation techniques
• Consider implementing just-in-time (JIT) privileged access solutions to minimize standing privileges on systems

# PowerShell: Check current patch status for Windows systems
Get-HotFix | Where-Object { $_.InstalledOn -gt (Get-Date).AddDays(-30) } | Sort-Object InstalledOn -Descending

# Review Winlogon registry configuration
Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" | Format-List