CVE-2025-13155 is an improper permissions vulnerability identified in the Lenovo Baiying Client software. The root cause is incorrect default permissions set on files or directories used by the application, classified under CWE-276 (Incorrect Default Permissions). This misconfiguration allows a local authenticated user—meaning someone with legitimate access to the system—to execute arbitrary code with elevated privileges, effectively escalating their rights beyond intended limits. The vulnerability does not require user interaction and has low attack complexity, making exploitation relatively straightforward once local access is obtained. The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) reflects that the attack vector is local, no specialized privileges beyond authenticated user are needed, and the impact on confidentiality, integrity, and availability is high. Although no public exploits or patches are currently available, the vulnerability poses a significant risk because it can lead to full system compromise by local attackers. The Lenovo Baiying Client is a proprietary software product, and the affected version is indicated as '0', which likely means the initial or all versions prior to a fix are vulnerable. Organizations using this client should consider this a critical local privilege escalation threat.

For European organizations, this vulnerability presents a serious risk of local privilege escalation, potentially allowing attackers who have gained limited access (e.g., through phishing, insider threat, or other means) to elevate their privileges to administrative or system level. This can lead to unauthorized access to sensitive data, disruption of critical services, and the ability to install persistent malware or backdoors. Given Lenovo's strong presence in European enterprise and government sectors, especially in countries with large IT infrastructures such as Germany, France, and the UK, the impact could be widespread. Critical infrastructure, financial institutions, and public sector organizations relying on Lenovo hardware and software may face increased risk of targeted attacks exploiting this vulnerability. The lack of a patch increases exposure time, and the absence of required user interaction lowers the barrier for exploitation once local access is achieved.

1. Immediately audit and restrict file and directory permissions related to the Lenovo Baiying Client to ensure they follow the principle of least privilege, preventing unauthorized modification or execution. 2. Limit local user accounts and enforce strict access controls to reduce the number of users who can exploit this vulnerability. 3. Implement robust endpoint detection and response (EDR) solutions to monitor for unusual local privilege escalation attempts or suspicious process executions. 4. Prepare for rapid deployment of official patches or updates from Lenovo once released; maintain close communication with Lenovo security advisories. 5. Employ application whitelisting and integrity monitoring to detect unauthorized changes to the Baiying Client files. 6. Conduct user awareness training to reduce the risk of initial local access through social engineering or insider threats. 7. Consider network segmentation to isolate systems running the Baiying Client, limiting lateral movement opportunities for attackers.