CVE-2025-67791

Executive Summary

CVE-2025-67791 exposes a critical authentication bypass vulnerability in DriveLock Enterprise Service (DES) affecting versions 24.1., 24.2., and 25.1.*. The flaw stems from an incomplete configuration in agent authentication, allowing any attacker on the network to impersonate a legitimate DriveLock agent. This enables unauthorized access to the DES, potentially leading to full compromise of endpoint management, data exfiltration, or lateral movement within the enterprise network. No patch is currently available, and no public exploit code has been released.

CVSS Breakdown & Threat Level

While no official CVSS vector is provided, the vulnerability is assessed as Critical based on the following analysis:

• Attack Vector (AV): Network (adjacent network access required)
• Attack Complexity (AC): Low (no special conditions)
• Privileges Required (PR): None
• User Interaction (UI): None
• Scope (S): Changed (compromise of DES can affect managed endpoints)
• Confidentiality (C): High
• Integrity (I): High
• Availability (A): High

Estimated CVSS Score: 9.0 (Critical)

Threat Level: Critical – Immediate action required. The vulnerability allows unauthenticated attackers to impersonate trusted agents, bypassing core security controls.

Deep Dive & Mechanics

The vulnerability resides in the authentication mechanism between DriveLock agents and the DES. DriveLock uses a tenant-based architecture where agents authenticate to the DES using a shared secret or certificate. Due to an incomplete configuration, the DES fails to properly validate the identity of connecting agents. An attacker on the same network can craft network packets that mimic a legitimate agent’s authentication handshake, gaining full access to the DES.

Attack Flow:

1. Reconnaissance: Attacker scans the network for DES instances (default ports or service discovery).
2. Impersonation: Attacker crafts a malicious agent registration request, spoofing the agent ID and authentication token.
3. Access: DES accepts the request, granting the attacker agent-level privileges.
4. Exploitation: Attacker can now issue commands to managed endpoints, exfiltrate data, or deploy malicious policies.

Root Cause: The DES does not enforce mutual TLS (mTLS) or strong cryptographic verification of agent identity. The configuration is incomplete, allowing any network entity to claim agent status.

Vulnerable vs. Patched Code

No patch is available. The vulnerable code likely resides in the agent authentication handler within the DES service. A patched version would require:

• Implementation of mTLS with client certificates.
• Strict validation of agent identity against a pre-shared key or hardware-bound token.
• Logging and alerting on failed authentication attempts.

Vulnerable Code (Conceptual):

# Vulnerable: Accepts any agent claiming a valid tenant ID
def authenticate_agent(agent_id, token):
    if token == "default_token":  # Weak validation
        return True
    return False

Patched Code (Conceptual):

# Patched: Validates agent certificate and token
def authenticate_agent(agent_id, token, cert):
    if not verify_certificate(cert, agent_id):
        return False
    if not verify_token(token, agent_id):
        return False
    return True

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Network access to the DES (e.g., same VLAN or VPN).
• Knowledge of a valid tenant ID (can be enumerated via network scanning).

Exploitation Steps:

1. Identify DES: Use Nmap to scan for DES service (default port 443 or custom).

   nmap -p 443 --script ssl-cert <target_ip>
   

2. Craft Impersonation Request: Use a tool like curl or custom Python script to send a forged agent registration.

   import requests
   url = "https://<des_ip>/agent/register"
   payload = {
       "agent_id": "legitimate_agent_01",
       "tenant_id": "target_tenant",
       "token": "default_token"
   }
   response = requests.post(url, json=payload, verify=False)
   print(response.text)
   

3. Issue Commands: Once authenticated, send policy updates or data retrieval requests.

Blue Team (Defense)

Detection:

• Monitor for multiple agent registration attempts from the same IP.
• Alert on failed authentication attempts (if logging is enabled).
• Use network segmentation to restrict DES access.

Honeypot Setup:

• Deploy a fake DES instance to capture attacker behavior.
• Log all incoming agent registration requests for analysis.

Indicators of Compromise (IOCs)

• Network: Unusual agent registration requests to DES on port 443 or custom ports.
• Logs: DES logs showing repeated authentication failures or successful registrations from unknown IPs.
• Endpoints: Unexpected policy changes or data exfiltration from managed endpoints.
• File Hashes: No known malware associated yet.

Example IOC (Network Traffic):

POST /agent/register HTTP/1.1
Host: <des_ip>
Content-Type: application/json
{"agent_id": "unknown_agent", "tenant_id": "target", "token": "default"}

Detection Engineering

YARA Rule

rule CVE_2025_67791_AgentImpersonation {
    meta:
        description = "Detects DriveLock agent impersonation attempts"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-67791"
    strings:
        $agent_reg = /POST \/agent\/register/i
        $token_default = "default_token"
        $tenant_id = /"tenant_id":\s*"[^"]+"/
    condition:
        $agent_reg and ($token_default or $tenant_id)
}

Sigma Rule

title: DriveLock Agent Impersonation Attempt
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects network traffic indicative of CVE-2025-67791 exploitation
author: Valters IT
logsource:
    category: network
    product: suricata
detection:
    selection:
        http.method: 'POST'
        http.url: '/agent/register'
        http.body: 'default_token'
    condition: selection
falsepositives:
    - Legitimate agent registration (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-67791 DriveLock Agent Impersonation"; flow:to_server; http.method; content:"POST"; http.uri; content:"/agent/register"; http.client_body; content:"default_token"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Network Segmentation: Isolate DES on a dedicated VLAN with strict ACLs.
2. Disable Unused Agents: Remove any unnecessary agent registrations.
3. Monitor Logs: Enable verbose logging on DES and monitor for anomalies.

Long-Term Fix:

• Apply vendor patch when available.
• Implement mTLS between agents and DES.
• Use hardware-bound tokens for agent authentication.

Workaround:

• If possible, switch to a different endpoint management solution until patch is released.

Valters IT