CVE-2022-32478
📋 TL;DR
This vulnerability in Insyde InsydeH2O firmware allows DMA attacks on a shared buffer between SMM and non-SMM code, creating a TOCTOU race condition. Attackers could corrupt SMRAM and escalate privileges to gain kernel-level access. Systems using InsydeH2O kernel versions 5.0 through 5.5 are affected.
💻 Affected Systems
- Insyde InsydeH2O firmware
📦 What is this software?
Insydeh2o by Insyde
Insydeh2o by Insyde
Insydeh2o by Insyde
Insydeh2o by Insyde
Insydeh2o by Insyde
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with kernel-level privilege escalation, allowing attackers to bypass security controls, install persistent malware, and access sensitive data.
Likely Case
Local privilege escalation allowing attackers to gain elevated system privileges from a lower-privileged account.
If Mitigated
Minimal impact if IOMMU protection is properly configured and firmware data is copied to SMRAM before validation.
🎯 Exploit Status
Exploitation requires local access and DMA capabilities. The vulnerability is in firmware, making exploitation more complex than typical software vulnerabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel version 5.6 or later
Vendor Advisory: https://www.insyde.com/security-pledge/SA-2023010
Restart Required: Yes
Instructions:
1. Check current firmware version in UEFI/BIOS settings. 2. Contact device manufacturer for firmware update. 3. Apply firmware update following manufacturer instructions. 4. Reboot system to complete installation.
🔧 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
SMRAM Data Copy
allCopy firmware block services data to SMRAM before validation
This requires firmware modification and cannot be implemented via OS commands
🧯 If You Can't Patch
- Restrict physical access to systems to prevent DMA attacks
- Implement strict access controls and monitoring for local privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check UEFI/BIOS firmware version in system settings. If InsydeH2O kernel version is between 5.0 and 5.5, system is vulnerable.Check Version:
On Windows: wmic bios get smbiosbiosversion | On Linux: dmidecode -t bios | grep VersionVerify Fix Applied:
Verify firmware version is 5.6 or later in UEFI/BIOS settings after update.📡 Detection & Monitoring
Log Indicators:
- Unexpected firmware access attempts
- DMA-related errors in system logs
- Privilege escalation attempts
Network Indicators:
- Not applicable - local attack only
SIEM Query:
Event logs showing local privilege escalation or firmware access anomalies