CVE-2026-2037 Overview
CVE-2026-2037 is a critical insecure deserialization vulnerability affecting GFI Archiver. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GFI Archiver. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.
The specific flaw exists within the configuration of the MArc.Core.Remoting.exe process, which listens on port 8017. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.
Critical Impact
Remote attackers can achieve SYSTEM-level code execution on affected GFI Archiver installations by exploiting this deserialization vulnerability, even with authentication bypass.
Affected Products
- GFI Archiver version 15.10
- GFI Archiver installations with exposed MArc.Core.Remoting.exe service on port 8017
Discovery Timeline
- 2026-02-20 - CVE-2026-2037 published to NVD
- 2026-02-24 - Last updated in NVD database
Technical Details for CVE-2026-2037
Vulnerability Analysis
This vulnerability is classified as CWE-502 (Deserialization of Untrusted Data). The flaw resides in the MArc.Core.Remoting.exe process, a component of GFI Archiver that handles remote communication on TCP port 8017. The process fails to properly validate user-supplied data before deserializing it, allowing attackers to craft malicious serialized objects that execute arbitrary code upon deserialization.
What makes this vulnerability particularly dangerous is the combination of the authentication bypass and the SYSTEM-level execution context. Even though the service nominally requires authentication, the existing authentication mechanism can be circumvented, effectively making this an unauthenticated remote code execution vulnerability.
The network-accessible nature of the vulnerability means that any attacker with network access to port 8017 can potentially exploit this flaw without requiring any user interaction.
Root Cause
The root cause of CVE-2026-2037 is improper input validation in the MArc.Core.Remoting.exe service. The application deserializes data received from remote clients without adequate verification of the data's integrity or origin. This allows an attacker to supply maliciously crafted serialized objects that, when processed by the application, execute arbitrary code.
The vulnerability is compounded by the service running with elevated SYSTEM privileges, meaning successful exploitation grants attackers complete control over the affected system. Additionally, the flawed authentication mechanism fails to prevent unauthorized access to the vulnerable deserialization functionality.
Attack Vector
The attack is network-based and targets the MArc.Core.Remoting.exe service listening on TCP port 8017. An attacker can exploit this vulnerability through the following sequence:
- The attacker identifies a GFI Archiver installation with port 8017 accessible
- The attacker bypasses the authentication mechanism protecting the service
- The attacker sends a specially crafted serialized payload to the service
- The service deserializes the malicious data without proper validation
- The attacker's code executes with SYSTEM privileges on the target system
The vulnerability does not require user interaction, and the attack can be performed entirely remotely. For detailed technical information, refer to the Zero Day Initiative Advisory ZDI-26-074.
Detection Methods for CVE-2026-2037
Indicators of Compromise
- Unexpected network connections to TCP port 8017 from external or untrusted IP addresses
- Unusual process spawning from MArc.Core.Remoting.exe or its parent processes
- Suspicious SYSTEM-level processes or commands executed following traffic to port 8017
- Anomalous serialization-related error messages in GFI Archiver logs
Detection Strategies
- Implement network monitoring for unexpected connections to TCP port 8017
- Deploy endpoint detection rules to identify suspicious child processes spawned by MArc.Core.Remoting.exe
- Configure SIEM alerts for authentication failures or anomalies related to GFI Archiver services
- Monitor for known .NET deserialization attack patterns in network traffic
Monitoring Recommendations
- Enable detailed logging for the GFI Archiver service and MArc.Core.Remoting.exe process
- Implement network segmentation to restrict access to port 8017 to authorized systems only
- Use application whitelisting to prevent unauthorized code execution in the SYSTEM context
- Deploy behavioral analysis solutions capable of detecting post-exploitation activities
How to Mitigate CVE-2026-2037
Immediate Actions Required
- Restrict network access to TCP port 8017 using firewall rules, allowing only trusted IP addresses
- Implement network segmentation to isolate GFI Archiver from untrusted networks
- Monitor for exploitation attempts while awaiting a vendor patch
- Consider temporarily disabling the MArc.Core.Remoting.exe service if the functionality is not critical to operations
Patch Information
Consult GFI Software for the latest security patches and updates addressing CVE-2026-2037. Monitor the Zero Day Initiative Advisory ZDI-26-074 for updated remediation guidance.
Workarounds
- Block external access to TCP port 8017 at the network perimeter
- Implement strict firewall rules to allow only explicitly authorized internal systems to communicate with the GFI Archiver service
- Consider running the MArc.Core.Remoting.exe service under a limited-privilege account if supported by the application
- Deploy network intrusion prevention systems (IPS) with signatures for deserialization attacks
# Example firewall rule to restrict access to port 8017
# Windows Firewall - Block inbound connections to port 8017 except from trusted IPs
netsh advfirewall firewall add rule name="Block GFI Archiver Port 8017" dir=in action=block protocol=TCP localport=8017
netsh advfirewall firewall add rule name="Allow Trusted IP to Port 8017" dir=in action=allow protocol=TCP localport=8017 remoteip=10.0.0.0/8
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
