CVE-2025-1683
📋 TL;DR
This vulnerability in the 1E Client's Nomad module allows attackers with local unprivileged access on Windows systems to delete arbitrary files by exploiting symbolic links. It affects 1E Client versions prior to 25.3. Attackers can leverage improper link resolution to bypass intended file access restrictions.
💻 Affected Systems
- 1E Client
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through deletion of critical system files, leading to data loss, system instability, or denial of service.
Likely Case
Data destruction, deletion of user files, or disruption of applications by deleting configuration files.
If Mitigated
Limited impact if proper access controls and monitoring are in place, though file deletion could still occur.
🎯 Exploit Status
Requires local access and ability to create symbolic links. Windows symbolic link creation typically requires specific privileges or configurations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 25.3 or later
Vendor Advisory: https://www.teamviewer.com/en/resources/trust-center/security-bulletins/1e-2025-2001/
Restart Required: No
Instructions:
1. Download 1E Client version 25.3 or later from official sources. 2. Install the update following standard deployment procedures. 3. Verify the update completed successfully.
🔧 Temporary Workarounds
Restrict symbolic link creation
WindowsConfigure Windows security policy to restrict creation of symbolic links to privileged users only
Configure via Group Policy: Computer Configuration > Windows Settings > Security Settings > Local Policies > User Rights Assignment > Create symbolic links
Monitor for symbolic link creation
WindowsEnable auditing for symbolic link creation events
auditpol /set /subcategory:"Other Object Access Events" /success:enable /failure:enable
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Deploy application control solutions to prevent unauthorized execution
🔍 How to Verify
Check if Vulnerable:
Check 1E Client version: Open 1E Client interface or check installed programs list for version numberCheck Version:
wmic product where "name like '%1E Client%'" get versionVerify Fix Applied:
Confirm 1E Client version is 25.3 or higher after update📡 Detection & Monitoring
Log Indicators:
- Unexpected file deletion events in Windows Security logs
- Symbolic link creation by non-privileged users
- 1E Client Nomad module errors
Network Indicators:
- No network indicators - local exploitation only
SIEM Query:
EventID=4663 AND ObjectName LIKE '%\1E\%' AND AccessMask=0x10000