CVE-2026-2036
📋 TL;DR
This vulnerability allows remote authenticated attackers to bypass authentication and execute arbitrary code with SYSTEM privileges on GFI Archiver installations. It affects systems running vulnerable versions of GFI Archiver where the MArc.Store.Remoting.exe process improperly deserializes untrusted data.
💻 Affected Systems
- GFI Archiver
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM privileges, enabling data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Attacker gains full control over the GFI Archiver server, potentially accessing archived communications and using the system as a foothold for lateral movement.
If Mitigated
Limited impact due to network segmentation and strict access controls, though authentication bypass could still expose the service.
🎯 Exploit Status
Authentication bypass makes exploitation easier; ZDI advisory suggests weaponization is probable given the high impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GFI vendor advisory for specific patched version
Vendor Advisory: https://www.gfi.com/support/security-advisories (check for CVE-2026-2036)
Restart Required: Yes
Instructions:
1. Check GFI security advisory for patch details. 2. Download and apply the official patch from GFI. 3. Restart the GFI Archiver service or system as required.
🔧 Temporary Workarounds
Block Network Access to MArc.Store.Remoting.exe
windowsRestrict network access to the vulnerable process using firewall rules to limit attack surface.
netsh advfirewall firewall add rule name="Block GFI MArc" dir=in action=block program="C:\Program Files\GFI\Archiver\MArc.Store.Remoting.exe" enable=yes
Disable Unnecessary Remoting Services
windowsIf MArc.Store.Remoting.exe is not essential, disable or stop the service to prevent exploitation.
sc stop "GFI Archiver MArc Store Remoting"
sc config "GFI Archiver MArc Store Remoting" start= disabled
🧯 If You Can't Patch
- Implement strict network segmentation to isolate GFI Archiver from untrusted networks.
- Enforce strong authentication and monitor for unusual login attempts to detect bypass attempts.
🔍 How to Verify
Check if Vulnerable:
Check if MArc.Store.Remoting.exe is running and compare GFI Archiver version against patched versions in vendor advisory.Check Version:
Check GFI Archiver interface or installation directory for version info; no universal command provided.Verify Fix Applied:
Verify the GFI Archiver version has been updated to the patched version and that MArc.Store.Remoting.exe no longer exhibits the vulnerability.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication events or failures in GFI Archiver logs
- Process creation events for MArc.Store.Remoting.exe with suspicious parameters
Network Indicators:
- Unexpected network connections to the remoting service port
- Anomalous traffic patterns to/from GFI Archiver server
SIEM Query:
Example: 'process_name:"MArc.Store.Remoting.exe" AND event_type:"process_creation" AND command_line:"*deserialization*"'