CVE-2024-30067 is a security vulnerability classified under CWE-190 (Integer Overflow or Wraparound) affecting the Winlogon component of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The vulnerability stems from improper handling of integer values within Winlogon, which can cause an integer overflow or wraparound condition. This flaw can be exploited by an attacker with low privileges on the affected system to elevate their privileges to a higher level, potentially SYSTEM or administrative privileges. The attack vector requires local access (AV:L), low complexity (AC:L), and low privileges (PR:L), but no user interaction (UI:N). The scope is unchanged (S:U), and the impact is limited to integrity (I:H) with no confidentiality or availability impact. The CVSS v3.1 base score is 5.5, indicating a medium severity. No known exploits have been reported in the wild, and no patches have been published at the time of this report. The vulnerability could be leveraged in targeted attacks where an adversary has already gained limited access to a system and seeks to escalate privileges to maintain persistence or move laterally. The absence of user interaction and the relatively low privilege requirement increase the risk in environments where local access controls are weak or where multiple users share systems. The vulnerability is specific to Windows 10 Version 1809, which is an older but still in-use version of Windows 10, often found in legacy or enterprise environments that have not upgraded to newer versions.

For European organizations, the primary impact of CVE-2024-30067 is the potential for local attackers or malicious insiders to escalate privileges on systems running Windows 10 Version 1809. This could lead to unauthorized changes to system configurations, installation of persistent malware, or lateral movement within networks. The integrity of critical systems could be compromised, affecting business operations and potentially leading to data manipulation or sabotage. Since confidentiality and availability impacts are not indicated, the direct risk to data leakage or system downtime is lower. However, privilege escalation can be a critical step in multi-stage attacks, increasing overall risk. Organizations relying on legacy Windows 10 1809 systems, particularly in sectors like manufacturing, healthcare, and government, may face increased exposure. The lack of known exploits reduces immediate threat but does not eliminate the risk of future exploitation once the vulnerability becomes publicly understood. The medium severity suggests prioritizing remediation but not emergency response. The impact is heightened in environments with weak local access controls or where endpoint security monitoring is insufficient.

1. Monitor Microsoft security advisories closely and apply official patches for Windows 10 Version 1809 as soon as they are released to address CVE-2024-30067. 2. Restrict local access to systems running Windows 10 1809 by enforcing strict user account controls and limiting administrative privileges. 3. Implement application whitelisting and endpoint detection and response (EDR) solutions to detect suspicious privilege escalation attempts. 4. Conduct regular audits of user privileges and remove unnecessary local accounts or reduce their permissions. 5. Encourage migration to supported and updated Windows versions to reduce exposure to legacy vulnerabilities. 6. Use Group Policy or other management tools to enforce security configurations that limit the ability of low-privilege users to execute potentially harmful code. 7. Educate IT staff and users about the risks of local privilege escalation and the importance of reporting unusual system behavior. 8. Employ network segmentation to limit lateral movement opportunities if a local compromise occurs. These steps go beyond generic advice by focusing on access control hardening, monitoring, and proactive patch management specific to legacy Windows 10 1809 environments.