CVE-2022-32473
📋 TL;DR
This vulnerability in Insyde InsydeH2O firmware allows DMA attacks on the HddPassword shared buffer, creating TOCTOU race conditions that can corrupt SMRAM and lead to privilege escalation. It affects systems with InsydeH2O kernel versions 5.0 through 5.5. Attackers with physical access or DMA capabilities can exploit this to gain elevated privileges.
💻 Affected Systems
- Systems with Insyde InsydeH2O firmware
📦 What is this software?
Insydeh2o by Insyde
Insydeh2o by Insyde
Insydeh2o by Insyde
Insydeh2o by Insyde
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SMM-level privileges, allowing attackers to bypass all security controls, install persistent malware, and access all system memory and hardware.
Likely Case
Privilege escalation from user/admin level to SMM level, enabling installation of firmware-level malware that survives OS reinstallation and disk replacement.
If Mitigated
Limited impact with proper IOMMU protection and SMRAM isolation, preventing DMA attacks and buffer corruption.
🎯 Exploit Status
Exploitation requires physical access or DMA hardware capabilities, making it complex but potentially devastating when successful.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel version 5.6 or later
Vendor Advisory: https://www.insyde.com/security-pledge/SA-2023005
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Download appropriate firmware update from manufacturer website. 3. Follow manufacturer's firmware update instructions. 4. Reboot system to apply firmware update.
🔧 Temporary Workarounds
Enable IOMMU Protection
allConfigure IOMMU to protect ACPI runtime memory used for command buffer
Enable VT-d/AMD-Vi in BIOS/UEFI settings
Configure IOMMU in OS kernel parameters
Disable Unnecessary DMA Devices
allDisable or restrict DMA-capable hardware that could be used for attacks
Disable Thunderbolt ports if not needed
Restrict PCIe hotplug capabilities
🧯 If You Can't Patch
- Implement strict physical security controls to prevent unauthorized device access
- Disable or password-protect BIOS/UEFI settings to prevent firmware modifications
🔍 How to Verify
Check if Vulnerable:
Check firmware version in BIOS/UEFI settings or using manufacturer's system information toolsCheck Version:
Manufacturer-specific commands vary; check with system documentationVerify Fix Applied:
Verify firmware version is 5.6 or later in BIOS/UEFI settings📡 Detection & Monitoring
Log Indicators:
- Unexpected firmware modification attempts
- BIOS/UEFI configuration changes
- SMM-related errors in system logs
Network Indicators:
- Not network exploitable - focus on physical access monitoring
SIEM Query:
Search for firmware update events, BIOS modification attempts, or physical security breach alerts