CVE-2024-27458

Executive Summary

CVE-2024-27458 is a local privilege escalation vulnerability in HP Hotkey Support software. The vulnerability allows a local attacker to gain elevated privileges on affected systems. HP has released a mitigation but has not provided a specific patched version. The CVSS score is 8.8 (High), indicating significant impact on confidentiality, integrity, and availability. No public proof-of-concept or exploit code is currently available.

CVSS Breakdown & Threat Level

• CVSS Score: 8.8 (High)
• Attack Vector: Local (AV:L)
• Attack Complexity: Low (AC:L)
• Privileges Required: Low (PR:L)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H)
• Integrity Impact: High (I:H)
• Availability Impact: High (A:H)

The threat level is high due to the low complexity and the ability for a local attacker with low privileges to fully compromise the system.

Deep Dive & Mechanics

The vulnerability resides in the HP Hotkey Support software, which manages programmable keys on HP laptops. The software likely runs with elevated privileges to handle hardware interactions. The flaw may involve improper handling of inter-process communication (IPC) or insecure file permissions, allowing a low-privileged user to inject commands or overwrite critical files to escalate privileges.

The exact mechanism is not publicly disclosed, but typical patterns for such vulnerabilities include:

• Insecure deserialization of input from a lower-privileged process.
• Weak file permissions on configuration or log files that the service writes to.
• DLL hijacking or path traversal in the service's file operations.

Vulnerable vs. Patched Code

No specific code comparison is available as the vendor has not released patch details. The mitigation likely involves hardening the service's IPC or file access controls.

Exploitation & Lab Setup

Red Team

1. Reconnaissance: Identify systems with HP Hotkey Support installed. Check for the service HPHotkeyMonitor or similar.
2. Exploitation: Since no public exploit exists, a red team would need to reverse-engineer the service to find the vulnerability. Potential attack vectors:
   • Named Pipe Injection: If the service listens on a named pipe, a low-privileged user could connect and send crafted messages.
   • File Permission Abuse: Check for writable files in the service's installation directory (e.g., C:\Program Files\HP\HP Hotkey Support).
3. Post-Exploitation: Once elevated, the attacker can execute arbitrary code as SYSTEM, install backdoors, or exfiltrate data.

Blue Team

1. Detection: Monitor for unusual child processes spawned by HPHotkeyMonitor.exe or HPHotkeySupport.exe.
2. Hunting: Look for file writes to the HP Hotkey Support directory by non-admin users.
3. Prevention: Apply the HP mitigation immediately. Restrict local user permissions where possible.

Indicators of Compromise (IOCs)

• File Paths:
  • C:\Program Files\HP\HP Hotkey Support\*
  • C:\ProgramData\HP\HP Hotkey Support\*
• Registry Keys:
  • HKLM\SOFTWARE\HP\HP Hotkey Support
• Process Names:
  • HPHotkeyMonitor.exe
  • HPHotkeySupport.exe
• Network Connections: None expected (local vulnerability).

Detection Engineering

YARA Rule

rule CVE_2024_27458_HP_Hotkey_Escalation {
    meta:
        description = "Detects potential exploitation of CVE-2024-27458 in HP Hotkey Support"
        author = "Valters IT"
        date = "2025-04-14"
        hash = "unknown"
    strings:
        $s1 = "HPHotkeyMonitor.exe" ascii wide nocase
        $s2 = "HPHotkeySupport.exe" ascii wide nocase
        $s3 = "C:\\Program Files\\HP\\HP Hotkey Support" ascii wide nocase
    condition:
        any of ($s*) and filesize < 10MB
}

Sigma Rule

title: CVE-2024-27458 HP Hotkey Support Local Privilege Escalation
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects suspicious child processes spawned by HP Hotkey Support services
author: Valters IT
date: 2025-04-14
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith:
            - 'HPHotkeyMonitor.exe'
            - 'HPHotkeySupport.exe'
        Image|endswith:
            - 'cmd.exe'
            - 'powershell.exe'
            - 'wscript.exe'
            - 'cscript.exe'
    condition: selection
falsepositives:
    - Legitimate administrative tasks
level: high

Suricata Rule

alert ip any any -> any any (msg:"CVE-2024-27458 HP Hotkey Support Local Escalation Attempt"; content:"HPHotkeyMonitor"; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

1. Apply HP Mitigation: Follow HP's advisory to update HP Hotkey Support to the latest version.
2. Restrict Local Access: Limit user accounts to standard privileges where possible.
3. Monitor Logs: Enable auditing for process creation and file access events.
4. Use Application Control: Block execution of untrusted binaries from the HP Hotkey Support directory.

Valters IT
Securing Digital Frontiers