CVE-2024-22102

Executive Summary

CVE-2024-22102 is a Denial of Service (DoS) vulnerability in Jungo WinDriver, a kernel-mode driver development toolkit. The flaw allows a local attacker to trigger a Windows Blue Screen of Death (BSOD) by exploiting an unhandled exception or resource exhaustion within the driver. This vulnerability is classified as a local DoS, requiring the attacker to have user-level access to the target system. No public proof-of-concept (PoC) code or exploit is currently available, and the EPSS score is 0.0%, indicating a very low probability of exploitation in the wild. The vendor has released a fix in version 12.6.0.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, which is likely a placeholder. Based on the vulnerability description (local DoS leading to BSOD), 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): None (N)
• Integrity (I): None (N)
• Availability (A): High (H)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Base Score: 5.5 (Medium)

Threat Level: Medium. The vulnerability requires local access, limiting its impact to environments where an attacker already has a foothold. However, a BSOD can disrupt critical services and cause operational downtime.

Deep Dive & Mechanics

Jungo WinDriver is a kernel-mode driver that allows user-mode applications to access hardware directly. The vulnerability lies in how the driver handles specific IOCTL (Input/Output Control) requests or system calls from user-mode processes.

Root Cause: The driver fails to properly validate or handle certain inputs or conditions, leading to an unhandled kernel exception. When a user-mode application sends a malformed or specially crafted IOCTL to the WinDriver device, the kernel-mode component enters an invalid state, causing a system crash (BSOD).

Attack Vector: A local attacker with user-level privileges can execute a malicious application that interacts with the WinDriver device (\\.\WinDriver or similar). The application sends a sequence of IOCTLs that trigger the vulnerability.

Impact: The immediate impact is a denial of service (system crash). This can be used to disrupt operations, force a reboot, or potentially as a precursor to a more sophisticated attack (e.g., by crashing a security monitoring tool).

Vulnerable vs. Patched Code

No specific code diff is publicly available. However, based on the vendor's advisory, the fix in version 12.6.0 likely involves:

• Input Validation: Adding checks to ensure IOCTL parameters are within expected bounds.
• Exception Handling: Implementing proper try/except blocks in kernel code to gracefully handle invalid requests instead of crashing.
• Resource Management: Ensuring that resources are properly released even when an error occurs.

Vulnerable Code (Conceptual):

// Vulnerable: No validation of input buffer size
NTSTATUS DriverDispatch(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp);
    ULONG ioControlCode = irpStack->Parameters.DeviceIoControl.IoControlCode;
    PVOID inputBuffer = Irp->AssociatedIrp.SystemBuffer;
    ULONG inputBufferLength = irpStack->Parameters.DeviceIoControl.InputBufferLength;

    // Directly uses inputBuffer without checking length
    ProcessData(inputBuffer, inputBufferLength);
    // ...
}

Patched Code (Conceptual):

// Patched: Added validation
NTSTATUS DriverDispatch(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp);
    ULONG ioControlCode = irpStack->Parameters.DeviceIoControl.IoControlCode;
    PVOID inputBuffer = Irp->AssociatedIrp.SystemBuffer;
    ULONG inputBufferLength = irpStack->Parameters.DeviceIoControl.InputBufferLength;

    // Validate input buffer length
    if (inputBufferLength < MINIMUM_VALID_SIZE || inputBufferLength > MAXIMUM_VALID_SIZE) {
        Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        return STATUS_INVALID_PARAMETER;
    }

    // Safe processing
    ProcessData(inputBuffer, inputBufferLength);
    // ...
}

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• Windows system with Jungo WinDriver version < 12.6.0 installed.
• Local user account (non-administrator may suffice).
• Knowledge of the WinDriver device name (typically \\.\WinDriver).

Exploitation Steps:

1. Identify the Device: Use WinObj or DeviceTree to confirm the device path.
2. Craft Malicious IOCTL: Write a C/C++ program that opens a handle to the device and sends a malformed IOCTL. The exact IOCTL code and buffer content are not public, but the goal is to cause an unhandled exception.
3. Trigger the Crash: Execute the program. The system should immediately crash with a blue screen.

Example Code (Conceptual):

#include <windows.h>
#include <stdio.h>

int main() {
    HANDLE hDevice = CreateFileA("\\\\.\\WinDriver", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    if (hDevice == INVALID_HANDLE_VALUE) {
        printf("Failed to open device. Error: %d\n", GetLastError());
        return 1;
    }

    DWORD bytesReturned;
    char inputBuffer[256] = {0}; // Malformed data
    // Fill with specific pattern to trigger vulnerability
    memset(inputBuffer, 0x41, sizeof(inputBuffer));

    BOOL result = DeviceIoControl(hDevice, 0x80002000, inputBuffer, sizeof(inputBuffer), NULL, 0, &bytesReturned, NULL);
    if (!result) {
        printf("IOCTL failed. Error: %d\n", GetLastError());
    }

    CloseHandle(hDevice);
    return 0;
}

Note: The IOCTL code 0x80002000 is a placeholder. The actual vulnerable IOCTL is not publicly disclosed.

Blue Team (Defensive)

Detection:

• Monitor for unusual IOCTL calls to \\.\WinDriver from non-trusted processes.
• Use Sysmon to log process creation and file access to the WinDriver device.
• Enable Windows Crash Dump collection and analyze memory dumps for the crash signature.

Prevention:

• Apply the vendor patch (upgrade to version 12.6.0).
• Restrict local user permissions to prevent execution of untrusted binaries.
• Use Application Control (e.g., WDAC) to block unauthorized executables.

Indicators of Compromise (IOCs)

• File: windrvr.sys (vulnerable version < 12.6.0)
• Registry: HKLM\SYSTEM\CurrentControlSet\Services\windrvr
• Device Path: \\.\WinDriver
• Event Log: System Event ID 1001 (BugCheck) with BugCheckCode related to DRIVER_IRQL_NOT_LESS_OR_EQUAL or KMODE_EXCEPTION_NOT_HANDLED.
• Crash Dump: Memory dump files in %SystemRoot%\MEMORY.DMP or %SystemRoot%\Minidump\*.dmp.

Detection Engineering

YARA Rule

rule CVE_2024_22102_WinDriver_DoS {
    meta:
        description = "Detects vulnerable Jungo WinDriver driver file (windrvr.sys) version < 12.6.0"
        author = "Valters IT"
        date = "2024-01-01"
        reference = "CVE-2024-22102"
    strings:
        $version_string = "WinDriver" ascii wide nocase
        $version_major = { 0C 00 00 00 } // Version 12.x
        $version_minor = { 05 00 00 00 } // Version 12.5.x or lower
    condition:
        $version_string and $version_major and $version_minor
}

Sigma Rule

title: CVE-2024-22102 - Jungo WinDriver DoS Exploitation Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects potential exploitation of CVE-2024-22102 by monitoring for unusual IOCTL calls to the WinDriver device.
author: Valters IT
date: 2024-01-01
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-22102
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 11 # FileCreate
        TargetFilename|contains: 'windrvr.sys'
    condition: selection
falsepositives:
    - Legitimate WinDriver updates
level: medium

Suricata Rule

alert ip any any -> any any (msg:"CVE-2024-22102 - Potential WinDriver DoS Exploitation"; content:"|00 00 00 00|"; depth:4; offset:0; classtype:attempted-dos; sid:1000001; rev:1;)

Note: This Suricata rule is a placeholder. Real detection would require deep packet inspection of IOCTL calls, which is not feasible at the network level.

Remediation & Mitigation

Immediate Actions:

1. Patch: Upgrade Jungo WinDriver to version 12.6.0 or later.
2. Workaround: If patching is not possible, restrict local user access to the system and disable the WinDriver service if not required.

Long-Term Measures:

• Implement a vulnerability management program to track and patch third-party drivers.
• Use endpoint detection and response (EDR) solutions to monitor for kernel-mode exploitation attempts.
• Conduct regular security audits of all kernel-mode drivers in use.

Valters IT Signature This report was generated by Valters IT Cyber Threat Intelligence Division. For questions, contact intelligence@valters-it.com.