CVE-2024-21820
📋 TL;DR
This vulnerability involves incorrect default permissions in Intel Xeon processor memory controller configurations when using Intel SGX (Software Guard Extensions). It allows a privileged user on the system to potentially escalate their privileges through local access. This affects systems with specific Intel Xeon processors using SGX technology.
💻 Affected Systems
- Intel Xeon processors with SGX support
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
A privileged attacker could gain full system control, bypassing security boundaries and accessing protected SGX enclave data.
Likely Case
Privileged users could elevate their permissions beyond intended levels, potentially accessing sensitive data or system resources.
If Mitigated
With proper access controls and monitoring, impact is limited to authorized privileged users who would need to actively exploit the vulnerability.
🎯 Exploit Status
Requires privileged access and knowledge of SGX memory controller configurations
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Microcode updates and BIOS/UEFI firmware updates from system manufacturers
Vendor Advisory: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01079.html
Restart Required: Yes
Instructions:
1. Check Intel advisory for affected processor models. 2. Contact system manufacturer for BIOS/UEFI updates. 3. Apply microcode updates through OS vendor patches. 4. Reboot system after updates.
🔧 Temporary Workarounds
Disable Intel SGX
allDisable SGX feature in BIOS/UEFI settings to mitigate vulnerability
Restrict privileged access
allLimit number of users with privileged access to affected systems
🧯 If You Can't Patch
- Implement strict access controls and monitor privileged user activities
- Isolate affected systems from critical network segments and data
🔍 How to Verify
Check if Vulnerable:
Check processor model and microcode version using 'cat /proc/cpuinfo' on Linux or system information tools on WindowsCheck Version:
Linux: 'cat /proc/cpuinfo | grep microcode' or 'dmesg | grep microcode'Verify Fix Applied:
Verify microcode version after update matches patched version in Intel advisory📡 Detection & Monitoring
Log Indicators:
- Unusual privileged access patterns
- SGX configuration changes
Network Indicators:
- None - local access only vulnerability
SIEM Query:
Search for privileged user activities on systems with Intel Xeon processors and SGX enabled