CVE-2024-30071 is a buffer over-read vulnerability classified under CWE-126, found in the Windows Remote Access Connection Manager component of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). This vulnerability arises due to improper bounds checking when handling certain data structures, leading to the possibility of reading memory beyond the intended buffer boundaries. An attacker with local privileges and the ability to execute code on the affected system can exploit this flaw to disclose sensitive information from memory, potentially leaking data that should remain confidential. The CVSS v3.1 base score is 4.7 (medium), reflecting that exploitation requires local access, high attack complexity, and low privileges, but no user interaction is needed. The scope is unchanged, and the impact affects confidentiality only, with no impact on integrity or availability. No known exploits have been reported in the wild, and Microsoft has not yet released a patch. The vulnerability is significant because it targets a core Windows component responsible for managing remote access connections, which are commonly used in enterprise environments. Attackers exploiting this vulnerability could gain access to sensitive information such as credentials or session tokens, which could facilitate further attacks or lateral movement within a network. Given the age of Windows 10 Version 1809, many organizations may have already migrated to newer versions, but legacy systems remain vulnerable.

For European organizations, the primary impact is the potential disclosure of sensitive information stored in memory by the Remote Access Connection Manager service. This could include credentials, tokens, or other confidential data that attackers with local access might leverage to escalate privileges or move laterally within networks. Organizations relying on legacy Windows 10 1809 systems, especially in sectors like finance, government, healthcare, and critical infrastructure, face increased risk if local access controls are weak. The vulnerability does not directly impact system integrity or availability, but information disclosure can facilitate subsequent attacks. Since exploitation requires local access and high attack complexity, remote attackers without initial access cannot exploit this vulnerability directly. However, insider threats or attackers who have already compromised a low-privilege account could leverage this flaw to gain more sensitive information. The lack of a patch increases the window of exposure, emphasizing the need for compensating controls. European entities with strict data protection regulations (e.g., GDPR) must consider the risk of data leakage and potential compliance implications.

1. Restrict local access to systems running Windows 10 Version 1809, especially those providing remote access services, by enforcing strict physical and logical access controls. 2. Apply the principle of least privilege to limit user and service accounts from having unnecessary local privileges that could be leveraged to exploit this vulnerability. 3. Monitor and audit local user activities for unusual behavior that could indicate attempts to exploit this vulnerability, including privilege escalation or memory inspection tools usage. 4. Disable or restrict the use of Remote Access Connection Manager services on systems where they are not required. 5. Prepare for rapid deployment of official patches or updates from Microsoft once released, including testing in controlled environments to ensure compatibility. 6. Consider upgrading affected systems to a supported and patched Windows version where this vulnerability is not present. 7. Employ endpoint detection and response (EDR) solutions capable of detecting anomalous local activity related to memory access or exploitation attempts. 8. Educate internal IT and security teams about this vulnerability and the importance of maintaining up-to-date systems and strict access controls.