CVE-2025-0886: Elliptic Labs Privilege Escalation Flaw

CVE-2025-0886 Overview

CVE-2025-0886 is an incorrect permissions vulnerability in Elliptic Labs Virtual Lock Sensor. The flaw allows a local, authenticated user to escalate privileges on affected systems. The issue is tracked under CWE-276: Incorrect Default Permissions and was disclosed through Lenovo Security Advisory LEN-182738. The vulnerability requires local access with low privileges but no user interaction, and impacts confidentiality, integrity, and availability of the host.

Critical Impact
A local authenticated user can abuse insecure default permissions in the Virtual Lock Sensor component to gain elevated privileges on Lenovo systems shipping the affected software.

Affected Products

Elliptic Labs Virtual Lock Sensor
Lenovo systems shipping the Virtual Lock Sensor component (see Lenovo Security Advisory LEN-182738)

Discovery Timeline

2025-07-17 - CVE-2025-0886 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-0886

Vulnerability Analysis

The vulnerability resides in the Elliptic Labs Virtual Lock Sensor, a component that uses ultrasonic proximity sensing to lock or unlock devices based on user presence. The software ships with insecure permissions on one or more resources associated with the sensor service. A local authenticated attacker can leverage those permissions to execute code or modify files in a context reserved for higher-privileged accounts. The outcome is a privilege escalation from a standard user session to a privileged context on the host.

The weakness is categorized as CWE-276: Incorrect Default Permissions. This class of flaw typically arises when installer routines or service configurations grant write, modify, or execute rights to non-privileged groups such as Users or Authenticated Users on binaries, services, directories, or registry keys that run as SYSTEM or an administrative account.

Root Cause

The root cause is misconfigured access control on Virtual Lock Sensor resources. When installation-time ACLs allow standard users to modify service binaries, configuration files, or scheduled tasks that execute at a higher integrity level, any change made by the attacker is later executed by the privileged process. The service acts as the confused deputy, running attacker-controlled content under its own elevated token.

Attack Vector

Exploitation requires local access and valid credentials on the target machine. The attacker enumerates file system and registry ACLs on the Virtual Lock Sensor installation, identifies a writable object referenced by a privileged process, and replaces or modifies that object. When the associated service, task, or auto-start entry runs, the attacker's payload executes with elevated privileges. No user interaction is required and the attack complexity is low. Refer to the vendor advisory for verified exploitation details.

Detection Methods for CVE-2025-0886

Indicators of Compromise

Modifications to files, DLLs, or executables within the Elliptic Labs Virtual Lock Sensor installation directory by non-administrative users.
New or altered scheduled tasks, services, or auto-start registry entries referencing Virtual Lock Sensor components.
Child processes spawned by the Virtual Lock Sensor service that do not match the expected process tree, such as cmd.exe, powershell.exe, or rundll32.exe.

Detection Strategies

Audit file system and registry ACLs on the Virtual Lock Sensor install path and compare against a known-good baseline to identify overly permissive entries.
Alert on write operations to service binaries or configuration files performed by non-privileged security identifiers (SIDs).
Correlate process creation events where a Virtual Lock Sensor service is the parent of an interactive shell or scripting host.

Monitoring Recommendations

Enable Windows Security event auditing (Event IDs 4663, 4670) on the sensor installation directory and related registry hives.
Monitor service configuration change events (Event ID 7045) and scheduled task creation events (Event ID 4698) referencing the affected component.
Track integrity-level transitions where a medium-integrity user process leads to code execution under NT AUTHORITY\SYSTEM via the sensor service.

How to Mitigate CVE-2025-0886

Immediate Actions Required

Apply the update referenced in Lenovo Security Advisory LEN-182738 to all affected endpoints.
Inventory systems that ship with Elliptic Labs Virtual Lock Sensor and prioritize patching on multi-user and shared workstations.
Restrict local logon rights on affected hosts to reduce the pool of users who can meet the attack precondition.

Patch Information

Lenovo published fixed component versions through advisory LEN-182738. Consult the advisory for the exact Virtual Lock Sensor version that remediates CVE-2025-0886 and the corresponding Lenovo system models. Deploy the vendor-supplied installer through your standard software distribution channel and verify installation by checking the file version and ACLs on the sensor installation directory.

Workarounds

If patching is delayed, tighten ACLs on the Virtual Lock Sensor installation directory and associated registry keys so that only Administrators and SYSTEM have write and modify rights.
Disable the Virtual Lock Sensor service on systems where ultrasonic presence detection is not required.
Enforce application control policies to block execution of unsigned or unexpected binaries from within the sensor installation path.

bash

# Configuration example: audit non-admin write access to the sensor install path (PowerShell)
Get-Acl 'C:\Program Files\Elliptic Labs\Virtual Lock Sensor' |
  Select-Object -ExpandProperty Access |
  Where-Object { $_.FileSystemRights -match 'Write|Modify|FullControl' -and
                 $_.IdentityReference -notmatch 'SYSTEM|Administrators|TrustedInstaller' }