CVE-2024-22106

Executive Summary

CVE-2024-22106 is a high-severity vulnerability in Jungo WinDriver, a popular driver development toolkit. The flaw stems from improper privilege management, allowing a local attacker to escalate privileges to kernel level, execute arbitrary code, or cause a Denial of Service (DoS). This vulnerability affects all versions of WinDriver prior to 12.5.1. Given the lack of a public proof-of-concept (PoC) and a low EPSS score, exploitation is currently not widespread, but the potential impact is severe for systems using vulnerable WinDriver components.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a kernel-level driver component from Jungo.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, which is likely a placeholder. Based on the description (local privilege escalation to kernel), a reasonable CVSS v3.1 vector would be: 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. Successful exploitation grants an attacker complete control over the affected system.

Deep Dive & Mechanics

The vulnerability resides in the privilege management logic of the Jungo WinDriver kernel driver. WinDriver allows user-mode applications to interact with hardware devices. The flaw occurs when a user-mode process requests elevated privileges (e.g., to access physical memory or I/O ports) without proper validation.

Mechanics:

1. A local attacker with limited user privileges runs a specially crafted application.
2. The application communicates with the WinDriver kernel driver (typically windrvr.sys or windrvr6.sys).
3. The driver fails to properly verify the caller's security context or token, granting kernel-level access.
4. The attacker can then execute arbitrary code in kernel mode, install rootkits, or crash the system.

Vulnerable vs. Patched Code

The exact code change is not publicly available, but the fix likely involves adding proper access checks (e.g., SeSinglePrivilegeCheck or ObReferenceObjectByHandle with appropriate access masks) in the driver's IOCTL handler.

Vulnerable (Conceptual):

NTSTATUS DriverDispatch(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp);
    if (irpStack->MajorFunction == IRP_MJ_DEVICE_CONTROL) {
        // No privilege check - vulnerable
        ProcessRequest(Irp);
    }
    return STATUS_SUCCESS;
}

Patched (Conceptual):

NTSTATUS DriverDispatch(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp);
    if (irpStack->MajorFunction == IRP_MJ_DEVICE_CONTROL) {
        // Proper privilege check
        if (!SeSinglePrivilegeCheck(SeTcbPrivilege, ExGetPreviousMode())) {
            return STATUS_PRIVILEGE_NOT_HELD;
        }
        ProcessRequest(Irp);
    }
    return STATUS_SUCCESS;
}

Exploitation & Lab Setup

Red Team

Objective: Escalate privileges from a standard user to SYSTEM.

Prerequisites:

• A Windows system with Jungo WinDriver < 12.5.1 installed.
• Local user access.

Steps:

1. Identify the driver: Use fltmc or driverquery to find the WinDriver service (e.g., windrvr6).
2. Open a handle: Use CreateFile to open \\.\WinDriver6.
3. Send a malicious IOCTL: Craft an IOCTL code that requests kernel memory access. The specific IOCTL code is not public, but can be reverse-engineered from the driver binary.
4. Execute payload: Once kernel access is granted, overwrite a system token or execute shellcode.

Example (Conceptual C++):

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

int main() {
    HANDLE hDevice = CreateFile("\\\\.\\WinDriver6", 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 ioctlCode = 0x80002000; // Example IOCTL - needs reversing
    BYTE inputBuffer[0x100] = {0};
    BYTE outputBuffer[0x100] = {0};
    DWORD bytesReturned = 0;

    BOOL result = DeviceIoControl(hDevice, ioctlCode, inputBuffer, sizeof(inputBuffer), outputBuffer, sizeof(outputBuffer), &bytesReturned, NULL);
    if (result) {
        printf("IOCTL succeeded. Kernel access granted.\n");
        // Execute privilege escalation payload
    } else {
        printf("IOCTL failed. Error: %d\n", GetLastError());
    }

    CloseHandle(hDevice);
    return 0;
}

Blue Team

Detection:

• Monitor for unusual CreateFile calls to \\.\WinDriver* devices from non-administrative processes.
• Look for unexpected DeviceIoControl calls with large or unusual IOCTL codes.
• Use Sysmon Event ID 11 (FileCreate) and Event ID 7 (ImageLoad) to track driver loading.

Hunting:

• Search for processes with low integrity levels opening handles to kernel drivers.
• Analyze driver logs for failed privilege checks (if available).

Indicators of Compromise (IOCs)

• File Hashes (windrvr6.sys): (Example - replace with actual hash if available)
  • SHA256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
• Registry Keys:
  • HKLM\SYSTEM\CurrentControlSet\Services\windrvr6
• Network: None (local vulnerability)
• Processes: Any process opening \\.\WinDriver6 without legitimate reason.

Detection Engineering

YARA Rule

rule CVE_2024_22106_WinDriver_Escalation {
    meta:
        description = "Detects exploitation attempts of CVE-2024-22106 in Jungo WinDriver"
        author = "Valters IT"
        date = "2024-01-01"
        reference = "CVE-2024-22106"
    strings:
        $s1 = "WinDriver" nocase
        $s2 = "windrvr6" nocase
        $s3 = "DeviceIoControl" nocase
        $s4 = "\\\\.\\WinDriver" nocase
    condition:
        (uint16(0) == 0x5A4D or uint32(0) == 0x00004550) and // PE file
        all of ($s*) and
        #s3 > 2
}

Sigma Rule

title: CVE-2024-22106 WinDriver Privilege Escalation Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects potential exploitation of CVE-2024-22106 via DeviceIoControl calls to WinDriver
author: Valters IT
date: 2024/01/01
logsource:
    category: process_access
    product: windows
detection:
    selection:
        TargetObject|contains: '\\.\WinDriver'
        GrantedAccess: '0x1fffff'  # Full control
    condition: selection
falsepositives:
    - Legitimate WinDriver development tools
level: high

Suricata Rule

alert ip any any -> any any (msg:"CVE-2024-22106 WinDriver Exploitation Attempt"; content:"|5c 00 5c 00 2e 00 5c 00 57 00 69 00 6e 00 44 00 72 00 69 00 76 00 65 00 72|"; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

1. Patch: Upgrade to Jungo WinDriver version 12.5.1 or later.
2. Workaround: If patching is not possible, restrict access to the WinDriver device by modifying its security descriptor using tools like sc sdset.
3. Monitoring: Enable auditing for kernel object access and monitor for suspicious DeviceIoControl calls.
4. Least Privilege: Ensure users run with minimal privileges. Do not grant unnecessary access to WinDriver tools.

Valters IT