CVE-2025-8485 is a vulnerability identified in the Lenovo App Store, classified under CWE-276 (Incorrect Default Permissions). This flaw arises from improper permission settings on files or directories used during the installation of applications via the Lenovo App Store. Specifically, the default permissions allow a local authenticated user to execute arbitrary code with elevated privileges, effectively enabling privilege escalation. The vulnerability requires the attacker to have local access to the system and some user interaction during the installation process but does not require additional authentication beyond local user credentials. The CVSS 4.0 base score is 7.0, indicating high severity, with vector metrics showing local attack vector (AV:L), low attack complexity (AC:L), no attack traceability (AT:N), privileges required (PR:L), and user interaction needed (UI:P). The impact on confidentiality, integrity, and availability is high, as an attacker could gain elevated privileges to manipulate system files, install persistent malware, or disrupt system operations. No patches or exploit code are currently publicly available, and no known exploits are reported in the wild. The vulnerability affects all versions of the Lenovo App Store as indicated, though specific version details are not provided. This vulnerability is particularly relevant for environments where Lenovo devices are widely deployed and where local user accounts have limited restrictions. Given the nature of the flaw, it is critical to address permission settings and monitor local user activities to prevent exploitation.

For European organizations, this vulnerability poses a significant risk primarily in environments with Lenovo hardware where the Lenovo App Store is installed and used. The ability for a local user to escalate privileges can lead to unauthorized access to sensitive data, installation of persistent malware, and potential disruption of critical business operations. This is especially concerning in sectors with strict data protection regulations such as finance, healthcare, and government, where elevated privileges could lead to data breaches or system compromise. The requirement for local access limits remote exploitation but insider threats or compromised local accounts could exploit this vulnerability. Additionally, organizations with shared workstations or insufficient endpoint security controls are at higher risk. The absence of a patch increases the window of exposure, necessitating immediate compensating controls. The impact extends to confidentiality, integrity, and availability, potentially leading to regulatory non-compliance and reputational damage if exploited.

1. Immediately audit and restrict permissions on directories and files used by the Lenovo App Store during application installation to ensure they follow the principle of least privilege. 2. Limit local user privileges by enforcing strict user account control policies and avoid granting unnecessary administrative rights. 3. Disable or restrict the use of the Lenovo App Store in environments where it is not essential, especially on critical systems. 4. Implement application whitelisting and endpoint detection and response (EDR) solutions to monitor and block unauthorized code execution attempts. 5. Educate users about the risks of executing untrusted applications and the importance of reporting suspicious installation behaviors. 6. Monitor system logs for unusual privilege escalation attempts or installation activities. 7. Stay alert for official patches or updates from Lenovo and apply them promptly once available. 8. Consider network segmentation to isolate systems with Lenovo App Store installations from sensitive network segments. 9. Employ multi-factor authentication for local accounts where possible to reduce risk of account compromise. 10. Conduct regular vulnerability assessments and penetration testing focusing on local privilege escalation vectors.