CVE-2024-29080

Executive Summary

CVE-2024-29080 identifies a privilege escalation vulnerability within the HP Display Control software component, which is part of the HP Application Enabling Software Driver. The vulnerability could allow an attacker with local access to elevate their privileges on the affected system. The exact attack vector and exploitation details remain unclear due to limited public information, but the potential impact is significant as it could lead to full system compromise. No proof-of-concept (PoC) code, exploit modules, or patches have been publicly released. The vulnerability is currently unpatched, and HP has not provided specific mitigation steps.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, indicating that no official CVSS vector has been assigned by NVD. However, based on the nature of the vulnerability (privilege escalation via a driver component), a reasonable estimated vector would be:

• Attack Vector (AV): Local (L) – Requires local access to the system.
• Attack Complexity (AC): Low (L) – Likely exploitable without special conditions.
• Privileges Required (PR): Low (L) – Attacker needs some initial access.
• User Interaction (UI): None (N) – No user action required beyond initial access.
• Scope (S): Unchanged (U) – The vulnerable component and the impacted component are the same.
• Confidentiality (C): High (H) – Full access to sensitive data.
• Integrity (I): High (H) – Ability to modify system files or configurations.
• Availability (A): High (H) – Could lead to denial of service or system instability.

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

Threat Level: High – Due to the potential for full system compromise and the lack of a patch.

Deep Dive & Mechanics

The vulnerability resides in the HP Display Control software component, which is part of the HP Application Enabling Software Driver. This driver is typically installed on HP systems to manage display settings and hardware interactions. The exact flaw is not publicly documented, but it likely involves improper handling of user-mode requests or insufficient validation of input parameters, leading to an elevation of privilege from a low-privileged user to SYSTEM or kernel-level access.

Potential Attack Vector:

1. An attacker gains initial access to the system (e.g., via phishing, malware, or physical access).
2. The attacker executes a specially crafted program that interacts with the vulnerable driver component.
3. The driver fails to properly validate the request, allowing the attacker to execute arbitrary code in a higher-privileged context (e.g., kernel mode or SYSTEM account).
4. The attacker then uses this elevated access to install persistent malware, exfiltrate data, or disable security controls.

Technical Details:

• The vulnerability is classified under CWE-269 (Improper Privilege Management), indicating that the software does not properly assign, modify, track, or check privileges for users, thereby enabling unintended privilege escalation.
• No specific function or IOCTL code has been identified publicly.
• The vulnerability is likely triggered via a device IO control (IOCTL) call to the driver, where a low-privileged user can send a malformed or specially crafted request that the driver processes with elevated privileges.

Vulnerable vs. Patched Code

Since no patch or specific version information is available, a direct code comparison cannot be provided. However, based on the vulnerability type, the following hypothetical example illustrates the flaw:

Vulnerable Code (C/C++ Driver):

NTSTATUS DriverDispatch(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp);
    ULONG ioctlCode = irpStack->Parameters.DeviceIoControl.IoControlCode;
    PVOID inputBuffer = Irp->AssociatedIrp.SystemBuffer;
    ULONG inputLength = irpStack->Parameters.DeviceIoControl.InputBufferLength;

    // No privilege check – any user can call this IOCTL
    switch (ioctlCode) {
        case IOCTL_SET_DISPLAY_CONFIG:
            // Process input buffer without validation
            ProcessDisplayConfig(inputBuffer, inputLength);
            break;
        // ... other cases
    }
    Irp->IoStatus.Status = STATUS_SUCCESS;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return STATUS_SUCCESS;
}

Patched Code (Hypothetical):

NTSTATUS DriverDispatch(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp);
    ULONG ioctlCode = irpStack->Parameters.DeviceIoControl.IoControlCode;
    PVOID inputBuffer = Irp->AssociatedIrp.SystemBuffer;
    ULONG inputLength = irpStack->Parameters.DeviceIoControl.InputBufferLength;

    // Check if the caller has the required privilege
    if (!SeSinglePrivilegeCheck(SeTakeOwnershipPrivilege, Irp->RequestorMode)) {
        Irp->IoStatus.Status = STATUS_PRIVILEGE_NOT_HELD;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        return STATUS_PRIVILEGE_NOT_HELD;
    }

    switch (ioctlCode) {
        case IOCTL_SET_DISPLAY_CONFIG:
            // Validate input buffer size and content
            if (inputLength < sizeof(DISPLAY_CONFIG)) {
                Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
                break;
            }
            ProcessDisplayConfig(inputBuffer, inputLength);
            break;
        // ... other cases
    }
    Irp->IoStatus.Status = STATUS_SUCCESS;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return STATUS_SUCCESS;
}

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Local access to a vulnerable HP system with the HP Application Enabling Software Driver installed.
• A low-privileged user account.
• Knowledge of the vulnerable IOCTL code (not publicly known; requires reverse engineering).

Lab Setup:

1. Environment: Windows 10/11 VM with HP drivers installed.
2. Tools: WinDbg, IDA Pro, Python with ctypes for IOCTL interaction.
3. Steps:
   • Identify the vulnerable driver (e.g., hpdisplay.sys).
   • Reverse engineer the driver to find the vulnerable IOCTL.
   • Craft a payload that triggers the vulnerability.
   • Execute the exploit to gain SYSTEM privileges.

Example Exploit Skeleton (Python):

import ctypes
import ctypes.wintypes

# Define IOCTL code (hypothetical)
IOCTL_VULN = 0x222000

# Open handle to the driver
kernel32 = ctypes.windll.kernel32
device_handle = kernel32.CreateFileW(
    "\\\\.\\HPDisplayControl",
    0xC0000000,  # GENERIC_READ | GENERIC_WRITE
    0,
    None,
    3,  # OPEN_EXISTING
    0,
    None
)

if device_handle == -1:
    print("Failed to open device")
    exit(1)

# Prepare input buffer (malformed data)
input_buffer = ctypes.create_string_buffer(b"A" * 0x100)

# Send IOCTL
bytes_returned = ctypes.wintypes.DWORD(0)
result = kernel32.DeviceIoControl(
    device_handle,
    IOCTL_VULN,
    input_buffer,
    len(input_buffer),
    None,
    0,
    ctypes.byref(bytes_returned),
    None
)

if result:
    print("IOCTL sent successfully")
else:
    print("IOCTL failed")

kernel32.CloseHandle(device_handle)

Blue Team (Detection & Defense)

Detection:

• Monitor for unusual IOCTL calls to HP driver devices.
• Look for processes running with SYSTEM privileges that were spawned from low-privileged contexts.
• Use Sysmon to log process creation and driver load events.

Defense:

• Apply the principle of least privilege to user accounts.
• Use application whitelisting to prevent unauthorized executables.
• Enable Windows Defender Exploit Guard (ASR rules) to block driver abuse.
• Regularly update HP drivers and firmware.

Indicators of Compromise (IOCs)

• File Hashes: (None publicly available; would be specific to exploit payloads)
• Registry Keys: HKLM\SYSTEM\CurrentControlSet\Services\hpdisplay (driver service)
• Process Names: hpdisplay.exe, HPDisplayControl.exe (if exploited)
• Network Connections: Unusual outbound connections from SYSTEM-level processes.
• Event Logs: Event ID 4672 (Special Logon) for SYSTEM account, Event ID 7030 (Service start failure) if driver is tampered.

Detection Engineering

YARA Rule

rule CVE_2024_29080_HP_Display_Control_Exploit {
    meta:
        description = "Detects potential exploit attempts for CVE-2024-29080"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-29080"
    strings:
        $ioctl = { 00 20 22 00 }  // IOCTL code 0x222000 (hypothetical)
        $driver_name = "HPDisplayControl" nocase
        $exploit_pattern = "DeviceIoControl" nocase
    condition:
        $driver_name or ($ioctl and $exploit_pattern)
}

Sigma Rule

title: CVE-2024-29080 HP Display Control Privilege Escalation
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects suspicious IOCTL calls to HP Display Control driver
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-29080
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\hpdisplay.exe'
        CommandLine|contains: 'DeviceIoControl'
    condition: selection
falsepositives:
    - Legitimate HP software updates
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-29080 HP Display Control Exploit - Outbound Connection"; flow:to_server,established; content:"HPDisplayControl"; nocase; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the HP Display Control driver if not required: Use sc stop hpdisplay and sc config hpdisplay start= disabled.
2. Restrict local access to trusted users only.
3. Monitor for suspicious activity using the provided detection rules.

Long-Term Fix:

• Await an official patch from HP. Check the HP Support website regularly for driver updates.
• Consider using a third-party driver blocklist (e.g., Microsoft Defender for Endpoint) to prevent exploitation.

Workaround:

• If the driver is essential, run HP Display Control in a sandboxed environment or with reduced privileges using tools like Windows Integrity Mechanism.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert