CVE-2023-47855
📋 TL;DR
This vulnerability in Intel TDX module software allows a privileged user with local access to potentially escalate privileges due to improper input validation. It affects systems running Intel TDX module software before version 1.5.05.46.698. The risk is limited to environments where attackers already have some level of privileged access.
💻 Affected Systems
- Intel TDX Module Software
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
A privileged attacker could gain higher privileges, potentially compromising the entire system or accessing sensitive data within TDX-protected environments.
Likely Case
Privileged users could abuse this to bypass intended security boundaries within TDX environments, though exploitation requires existing access.
If Mitigated
With proper access controls and monitoring, impact is limited as exploitation requires privileged local access.
🎯 Exploit Status
Exploitation requires privileged local access and knowledge of TDX module internals. No public exploits known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.05.46.698 or later
Vendor Advisory: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01036.html
Restart Required: Yes
Instructions:
1. Check current TDX module version. 2. Download updated TDX module from Intel. 3. Update TDX module following Intel's documentation. 4. Reboot system to load new module.
🔧 Temporary Workarounds
Disable TDX Module
linuxTemporarily disable Intel TDX functionality if not required
echo 'blacklist intel_tdx' > /etc/modprobe.d/disable-tdx.conf
rmmod intel_tdx
🧯 If You Can't Patch
- Restrict local privileged access to systems with TDX module
- Implement strict monitoring of privileged user activities on TDX-enabled systems
🔍 How to Verify
Check if Vulnerable:
Check TDX module version: dmesg | grep -i tdx or check /sys/module/intel_tdx/versionCheck Version:
dmesg | grep -i 'tdx.*version' | head -5Verify Fix Applied:
Verify TDX module version is 1.5.05.46.698 or higher after update📡 Detection & Monitoring
Log Indicators:
- Unusual TDX module loading/unloading
- Privileged user accessing TDX-related system calls
Network Indicators:
- Not applicable - local exploit only
SIEM Query:
source="kernel" AND "tdx" AND ("error" OR "warning" OR "failed")