CVE-2023-53973
📋 TL;DR
This vulnerability in Zillya Total Security allows low-privileged users to escalate privileges by exploiting the quarantine module's file restoration process. Attackers can use symbolic links to copy quarantined files to restricted system directories, potentially enabling DLL hijacking attacks. Only users with local access to systems running the vulnerable software are affected.
💻 Affected Systems
- Zillya Total Security
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through DLL hijacking leading to SYSTEM-level access, enabling installation of persistent malware, credential theft, and lateral movement.
Likely Case
Local privilege escalation allowing attackers to execute arbitrary code with elevated privileges, bypass security controls, and access sensitive system resources.
If Mitigated
Limited impact if proper access controls, application whitelisting, and privilege separation are implemented, though the vulnerability still provides attack surface.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB. Requires local access and low-privileged user account. Symbolic link techniques are well-documented and relatively easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://zillya.com/
Restart Required: No
Instructions:
1. Check Zillya website for security updates. 2. Update to latest version if available. 3. Monitor vendor communications for patch release.
🔧 Temporary Workarounds
Disable quarantine module
windowsTemporarily disable the quarantine functionality in Zillya Total Security to prevent exploitation
Restrict symbolic link creation
windowsConfigure Windows security policy to restrict creation of symbolic links to privileged users only
secedit /export /cfg secpol.cfg
Edit secpol.cfg to set 'Create symbolic links' to Administrators only
secedit /configure /db secpol.sdb /cfg secpol.cfg
🧯 If You Can't Patch
- Implement strict access controls to limit local user accounts and privileges
- Deploy application whitelisting to prevent unauthorized DLL loading and execution
🔍 How to Verify
Check if Vulnerable:
Check Zillya Total Security version in About section or via Programs and Features. If version is 3.0.2367.0, system is vulnerable.Check Version:
wmic product where name='Zillya Total Security' get versionVerify Fix Applied:
Verify Zillya Total Security has been updated to a version later than 3.0.2367.0. Test symbolic link creation and quarantine restoration functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual file operations in system directories
- Multiple quarantine restoration attempts
- Symbolic link creation by non-admin users
Network Indicators:
- None - this is a local privilege escalation vulnerability
SIEM Query:
EventID=4663 AND ObjectName LIKE '%\Windows\System32\%' AND ProcessName LIKE '%zillya%'