CVE-2025-58384: DOXENSE WATCHDOC RCE Vulnerability

CVE-2025-58384 Overview

CVE-2025-58384 is an insecure deserialization vulnerability affecting DOXENSE WATCHDOC before version 6.1.1.5332. The vulnerability exists within the .NET Remoting library used by the Watchdoc administration interface, allowing attackers to achieve remote code execution by supplying maliciously crafted serialized data. This flaw represents a severe security risk as it can be exploited remotely without authentication.

Critical Impact

Remote code execution through insecure deserialization in the .NET Remoting library enables complete system compromise without requiring authentication or user interaction.

Affected Products

• DOXENSE WATCHDOC versions prior to 6.1.1.5332
• Systems utilizing the Watchdoc administration interface with .NET Remoting enabled

Discovery Timeline

• 2025-09-26 - CVE-2025-58384 published to NVD
• 2025-09-29 - Last updated in NVD database

Technical Details for CVE-2025-58384

Vulnerability Analysis

This vulnerability falls under CWE-502 (Deserialization of Untrusted Data), a well-documented class of security flaws that occurs when applications deserialize data from untrusted sources without proper validation. In the context of DOXENSE WATCHDOC, the .NET Remoting library within the administration interface accepts serialized objects that can be manipulated by attackers to execute arbitrary code on the target system.

.NET Remoting is a legacy inter-process communication framework that has known security concerns when exposed to untrusted networks. The framework allows objects to be serialized, transmitted, and deserialized on remote systems. When deserialization occurs without proper type filtering or validation, attackers can craft malicious payloads that, upon deserialization, trigger code execution through gadget chains present in the .NET runtime or application dependencies.

The vulnerability is particularly dangerous because it requires no authentication and can be exploited directly over the network, making it an attractive target for automated exploitation and lateral movement within enterprise environments.

Root Cause

The root cause stems from the use of .NET Remoting without adequate security controls in the Watchdoc administration interface. .NET Remoting inherently trusts incoming serialized data and will instantiate objects based on type information provided in the stream. Without implementing type filtering (such as SerializationBinder restrictions) or transitioning to more secure communication mechanisms, the application remains vulnerable to deserialization attacks.

The .NET BinaryFormatter and related serializers used by .NET Remoting have been flagged by Microsoft as insecure by design when processing untrusted input, as they allow arbitrary type instantiation that can lead to code execution.

Attack Vector

The attack vector is network-based, targeting the Watchdoc administration interface. An attacker can craft a malicious serialized payload containing gadget chains that execute arbitrary commands when deserialized by the vulnerable application. Common gadget chains in .NET environments leverage types such as ObjectDataProvider, TypeConfuseDelegate, or PSObject to achieve code execution.

The attack flow typically involves:

1. Identifying the exposed .NET Remoting endpoint on the Watchdoc administration interface
2. Crafting a serialized payload using tools like ysoserial.net with appropriate gadget chains
3. Transmitting the malicious payload to the vulnerable endpoint
4. Achieving code execution with the privileges of the Watchdoc application service

For detailed technical information regarding exploitation mechanics, refer to the Doxense CVE-2025-58384 Advisory.

Detection Methods for CVE-2025-58384

Indicators of Compromise

• Unexpected network connections to .NET Remoting ports associated with the Watchdoc administration interface
• Anomalous process spawning from the Watchdoc service process (e.g., cmd.exe, powershell.exe, or other shell processes)
• Suspicious serialized data patterns in network traffic containing known .NET gadget chain signatures
• Unusual file creation or modification activities in Watchdoc installation directories

Detection Strategies

• Deploy network intrusion detection rules to identify .NET Remoting traffic containing suspicious serialized object patterns
• Implement endpoint detection rules monitoring for child process creation from the Watchdoc service
• Configure application whitelisting to prevent unauthorized executables from being spawned by the Watchdoc process
• Monitor Windows Event Logs for .NET runtime exceptions or unusual deserialization errors from the Watchdoc application

Monitoring Recommendations

• Enable detailed logging for the Watchdoc administration interface and forward logs to a SIEM solution
• Configure network monitoring to alert on unexpected traffic to Watchdoc administration ports
• Implement file integrity monitoring on Watchdoc installation directories
• Deploy SentinelOne agents to detect and respond to post-exploitation activities such as credential harvesting or lateral movement

How to Mitigate CVE-2025-58384

Immediate Actions Required

• Upgrade DOXENSE WATCHDOC to version 6.1.1.5332 or later immediately
• If immediate patching is not possible, restrict network access to the Watchdoc administration interface using firewall rules
• Audit exposed services and ensure the .NET Remoting endpoint is not accessible from untrusted networks
• Review system logs for any indicators of prior exploitation attempts

Patch Information

DOXENSE has released a security update addressing this vulnerability in WATCHDOC version 6.1.1.5332. Organizations should apply this update as soon as possible. The patch is available through the Doxense Update Portal. For detailed patch information and security guidance, refer to the official security advisory.

Workarounds

• Implement network segmentation to isolate the Watchdoc administration interface from untrusted networks
• Configure host-based firewall rules to restrict access to the administration interface to authorized IP addresses only
• Deploy a web application firewall (WAF) or network intrusion prevention system (IPS) with rules to detect .NET deserialization attacks
• Consider disabling .NET Remoting functionality if not required for operational purposes

# Example: Windows Firewall rule to restrict access to Watchdoc admin interface
# Replace PORT_NUMBER with the actual port used by Watchdoc administration
netsh advfirewall firewall add rule name="Restrict Watchdoc Admin" dir=in action=block protocol=tcp localport=PORT_NUMBER
netsh advfirewall firewall add rule name="Allow Watchdoc Admin from Trusted" dir=in action=allow protocol=tcp localport=PORT_NUMBER remoteip=10.0.0.0/8