CVE-2024-4143 Overview
A critical security vulnerability has been identified in certain HP PC products using AMI BIOS that could allow arbitrary code execution. The vulnerability stems from a buffer overflow condition (CWE-120) in the BIOS firmware, which can be exploited remotely without requiring authentication or user interaction. AMI has released firmware updates to mitigate this vulnerability.
Critical Impact
This BIOS-level vulnerability enables attackers to execute arbitrary code with the highest system privileges, potentially compromising the entire system at the firmware level and persisting across operating system reinstallations.
Affected Products
- HP PC Products using AMI BIOS (specific models listed in HP Security Advisory)
- AMI BIOS firmware versions prior to the security update
- Various HP desktop and laptop systems
Discovery Timeline
- 2024-07-15 - CVE-2024-4143 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2024-4143
Vulnerability Analysis
This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), commonly known as a classic buffer overflow. BIOS firmware vulnerabilities are particularly severe because they operate at the lowest level of the system software stack, below the operating system. Exploitation at this level can result in complete system compromise with persistence that survives operating system reinstallation, secure boot bypass, and potential rootkit installation at the firmware level.
The network-accessible attack vector combined with no required privileges or user interaction makes this vulnerability especially dangerous in enterprise environments where HP systems may be accessible over corporate networks. Successful exploitation grants attackers full control over confidentiality, integrity, and availability of the affected system.
Root Cause
The root cause is a buffer overflow vulnerability (CWE-120) in the AMI BIOS code used by HP PC products. Buffer overflow vulnerabilities occur when a program writes data beyond the boundaries of a fixed-size buffer, potentially overwriting adjacent memory. In BIOS firmware, such overflows can corrupt critical data structures or allow injection of malicious code that executes with System Management Mode (SMM) privileges.
Attack Vector
The vulnerability is exploitable over the network with low attack complexity. An attacker does not require any privileges or user interaction to exploit this flaw. The attack could potentially be carried out through:
- Malicious network packets targeting BIOS services
- Exploitation of network-exposed BIOS management interfaces
- Remote management protocols that interact with the BIOS firmware
Due to the sensitive nature of this BIOS vulnerability, specific exploitation details are not provided. For technical information, refer to the HP Security Advisory.
Detection Methods for CVE-2024-4143
Indicators of Compromise
- Unexpected BIOS version changes or corruption detected during system startup
- System instability or unexpected behavior that persists across OS reinstallation
- Anomalous network traffic targeting system management ports
- Unauthorized modifications to UEFI Secure Boot configuration
Detection Strategies
- Implement BIOS integrity monitoring solutions to detect unauthorized firmware modifications
- Monitor network traffic for suspicious activity targeting system management interfaces
- Deploy hardware-based attestation mechanisms to verify firmware integrity
- Utilize endpoint detection and response (EDR) solutions capable of monitoring pre-boot environments
Monitoring Recommendations
- Enable BIOS event logging and centralize logs for security analysis
- Implement network segmentation to restrict access to system management interfaces
- Configure alerts for any unauthorized BIOS update attempts
- Regularly audit BIOS versions across the fleet against known vulnerable versions
How to Mitigate CVE-2024-4143
Immediate Actions Required
- Review the HP Security Advisory for affected product models
- Identify all HP systems using AMI BIOS in your environment
- Prioritize patching for internet-facing and critical systems
- Restrict network access to system management interfaces until patching is complete
Patch Information
AMI has released firmware updates to address this vulnerability. HP has made these updates available through their support channels. Organizations should obtain the appropriate BIOS update for their specific HP PC models from the HP Security Advisory and apply them according to their change management procedures. Due to the critical nature of BIOS updates, ensure proper backup and recovery procedures are in place before applying firmware updates.
Workarounds
- Implement strict network segmentation to limit exposure of system management interfaces
- Disable or restrict access to remote BIOS management features where not required
- Enable UEFI Secure Boot to help prevent execution of unauthorized firmware code
- Implement hardware-based security features such as TPM attestation where available
- Monitor systems for signs of compromise while awaiting patch deployment
# Example: Verify current BIOS version on HP systems (Windows PowerShell)
Get-WmiObject -Class Win32_BIOS | Select-Object SMBIOSBIOSVersion, Manufacturer, ReleaseDate
# Example: Check for HP BIOS updates using HP Image Assistant (HPIA)
# Download HPIA from HP and run to identify available BIOS updates
# HPImageAssistant.exe /Operation:Analyze /Category:BIOS /Action:List
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
