CVE-2025-55187

Executive Summary

CVE-2025-55187 is a privilege escalation vulnerability affecting DriveLock versions 24.1.4, 24.2.5, and 25.1.2. An attacker with local access can exploit this flaw to gain elevated privileges, potentially leading to full system compromise. The vulnerability is unpatched in the affected versions, and no public proof-of-concept (PoC) or exploit code is currently available. The EPSS score is 0.0%, indicating a low probability of exploitation in the wild at this time. However, given the nature of the vulnerability (privilege escalation), it poses a significant risk to affected systems.

Supply Chain & Package Security

This vulnerability is not related to any open-source package manager (NPM, PyPI, Go, Ruby). It is a proprietary software vulnerability in DriveLock, a device control and endpoint security solution.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, which is likely a placeholder. Based on the description (privilege escalation), a reasonable CVSS v3.1 vector would be:

• Attack Vector (AV): Local (L)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): Low (L)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Base Score: 7.8 (High)

Threat Level: High. Local privilege escalation vulnerabilities can allow an attacker to gain full control of the system, bypassing security controls.

Deep Dive & Mechanics

The vulnerability exists in DriveLock versions 24.1.4, 24.2.5, and 25.1.2. The exact mechanism is not publicly disclosed, but it involves improper handling of permissions or access controls, allowing a low-privileged user to escalate to a higher privilege level (likely SYSTEM or Administrator). This could be due to:

• Insecure service permissions
• Weak file system permissions on executable or configuration files
• Unquoted service paths
• DLL hijacking
• Improper validation of user input leading to arbitrary code execution in a privileged context

The vulnerability is fixed in versions 24.1.5, 24.2.6, and 25.1.4, suggesting a code change that corrects the privilege handling.

Vulnerable vs. Patched Code

No specific code diff is available. However, the patch likely involves:

• Correcting permission checks before performing privileged operations.
• Ensuring that services run with the least privilege necessary.
• Validating user input to prevent injection attacks.

Vulnerable Code (Conceptual):

// Vulnerable: No privilege check
void PerformAdminTask()
{
    // Execute task with high privileges
    ExecuteCommand("format C: /Y");
}

Patched Code (Conceptual):

// Patched: Check if user is admin
void PerformAdminTask()
{
    if (!IsUserAdmin())
    {
        throw new UnauthorizedAccessException("Only administrators can perform this task.");
    }
    // Execute task with high privileges
    ExecuteCommand("format C: /Y");
}

Exploitation & Lab Setup

Red Team

Since no public exploit is available, a red team would need to reverse-engineer the vulnerable versions to identify the exact vulnerability. Potential attack vectors:

1. Service Exploitation: Identify DriveLock services running with SYSTEM privileges. Attempt to modify service binaries or configuration files.
2. DLL Hijacking: Place a malicious DLL in a directory that is searched before the legitimate one.
3. Unquoted Service Path: If a service path contains spaces and is unquoted, an attacker can place an executable in a subdirectory.

Lab Setup:

1. Install DriveLock 24.1.4 on a Windows VM.
2. Create a low-privileged user account.
3. Use tools like accesschk, Process Monitor, or PowerUp to identify misconfigurations.
4. Attempt to exploit the vulnerability to gain SYSTEM privileges.

Example Command (Unquoted Service Path):

sc qc DriveLockService

If the path is unquoted, create a malicious executable in a subdirectory.

Blue Team

Detection:

• Monitor for unusual service modifications or creation of new services.
• Alert on file writes to DriveLock installation directories by non-admin users.
• Use Sysmon to detect DLL hijacking attempts (Event ID 7 - Image loaded).

Hunting:

• Search for processes running with high integrity level that were spawned by low-integrity processes.
• Look for anomalous command-line arguments in DriveLock processes.

Indicators of Compromise (IOCs)

• File Hashes (SHA256): (None available, but monitor for modified DriveLock binaries)
• Registry Keys: HKLM\SYSTEM\CurrentControlSet\Services\DriveLock*
• Processes: DriveLockService.exe, DriveLockAgent.exe
• Network Connections: DriveLock typically communicates with a management server. Unusual outbound connections from DriveLock processes may indicate compromise.
• Event Logs:
  • Windows Security Log: Event ID 4672 (Special Logon) for SYSTEM account.
  • Windows System Log: Event ID 7030 (Service start failure) or 7045 (New service installed).

Detection Engineering

YARA Rule

rule CVE_2025_55187_DriveLock_PrivEsc
{
    meta:
        description = "Detects potential exploitation of CVE-2025-55187 in DriveLock"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-55187"
    strings:
        $s1 = "DriveLock" nocase
        $s2 = "24.1.4" nocase
        $s3 = "24.2.5" nocase
        $s4 = "25.1.2" nocase
        $s5 = "privilege" nocase
    condition:
        any of ($s1, $s2, $s3, $s4) and $s5
}

Sigma Rule

title: DriveLock Privilege Escalation Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects attempts to exploit CVE-2025-55187 in DriveLock
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-55187
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\DriveLockService.exe'
            - '\DriveLockAgent.exe'
        CommandLine|contains:
            - '--elevate'
            - '--privilege'
    condition: selection
falsepositives:
    - Legitimate administrative actions
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-55187 DriveLock Privilege Escalation Attempt"; flow:to_server,established; content:"DriveLock"; nocase; content:"privilege"; nocase; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade DriveLock to the latest patched version (24.1.5, 24.2.6, or 25.1.4).
2. Restrict local access to DriveLock systems to trusted users only.
3. Apply the principle of least privilege to all user accounts.

Long-term Mitigations:

• Implement application whitelisting to prevent unauthorized executables.
• Use endpoint detection and response (EDR) solutions to monitor for privilege escalation attempts.
• Regularly audit service permissions and file system ACLs.
• Enable Windows Defender Exploit Guard to mitigate common attack vectors.

Workarounds (if patching is not immediately possible):

• Disable the vulnerable DriveLock service if it is not critical.
• Use Group Policy to restrict access to DriveLock binaries and configuration files.

Valters IT