CVE-2024-30034 is a medium-severity vulnerability affecting Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The issue is classified under CWE-843, which relates to 'Access of Resource Using Incompatible Type,' commonly known as a type confusion vulnerability. Specifically, this vulnerability exists in the Windows Cloud Files Mini Filter Driver, a component responsible for managing cloud file synchronization and caching on Windows systems. The flaw allows an attacker with limited privileges (local access with low privileges) to cause an information disclosure by exploiting the type confusion, which leads to improper handling of data types within the driver. This can result in unauthorized access to sensitive information residing in memory or managed by the cloud files system. The vulnerability does not require user interaction and does not impact system integrity or availability, but it does have a high impact on confidentiality. The attack vector is local (AV:L), meaning the attacker must have local access to the system, and the attack complexity is low (AC:L), indicating that exploitation does not require sophisticated conditions. Privileges required are low (PR:L), so an attacker with limited user rights could exploit this vulnerability. No known exploits are currently reported in the wild, and no official patches have been linked yet. The vulnerability was published on May 14, 2024, and has a CVSS 3.1 base score of 5.5, reflecting its medium severity. The scope is unchanged (S:U), meaning the vulnerability affects only the vulnerable component without impacting other system components. Overall, this vulnerability poses a risk of sensitive data leakage on affected Windows 10 systems, particularly those still running the older 1809 version, which is less common in modern enterprise environments but may still be present in legacy or specialized systems.

For European organizations, the primary impact of CVE-2024-30034 is the potential unauthorized disclosure of sensitive information from systems running Windows 10 Version 1809. This could include confidential corporate data, user credentials, or other sensitive information cached or managed by the Cloud Files Mini Filter Driver. Since the vulnerability requires local access with low privileges, the risk is higher in environments where endpoint security is weak, or where attackers can gain initial footholds via phishing, insider threats, or lateral movement within networks. The information disclosure could facilitate further attacks, such as privilege escalation or targeted espionage. Critical sectors such as finance, healthcare, government, and industrial control systems could be particularly impacted if legacy Windows 10 1809 systems are still in use. Additionally, organizations relying on cloud file synchronization services integrated with Windows may see increased risk exposure. The vulnerability does not affect system availability or integrity directly, so operational disruption is unlikely, but confidentiality breaches could lead to regulatory compliance issues under GDPR and other data protection laws prevalent in Europe.

Prioritize upgrading affected systems from Windows 10 Version 1809 to a more recent, supported Windows version where this vulnerability is not present. If immediate upgrade is not feasible, implement strict local access controls to limit user privileges and prevent unauthorized local access to vulnerable systems. Enforce endpoint security solutions that monitor and restrict suspicious local activities, including behavior-based detection of attempts to exploit type confusion vulnerabilities. Regularly audit and inventory systems to identify any running Windows 10 Version 1809, especially in critical infrastructure and sensitive environments. Apply any forthcoming security patches from Microsoft as soon as they become available, and monitor official Microsoft security advisories for updates on this vulnerability. Restrict or monitor usage of cloud file synchronization features on vulnerable systems, or disable the Windows Cloud Files Mini Filter Driver if feasible without impacting business operations. Implement network segmentation to limit lateral movement opportunities for attackers who gain local access to vulnerable endpoints. Conduct user awareness training focused on preventing initial access vectors such as phishing, which could lead to local access exploitation.