CVE-2024-21781
📋 TL;DR
This UEFI firmware vulnerability in certain Intel processors allows privileged users to potentially disclose sensitive information or cause denial of service through local access. It affects systems with specific Intel processors running vulnerable UEFI firmware versions. The vulnerability stems from improper input validation in the firmware layer.
💻 Affected Systems
- Intel processors with vulnerable UEFI firmware
⚠️ 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
Privileged attacker could extract sensitive firmware data or cause system instability leading to persistent denial of service requiring physical intervention.
Likely Case
Privileged user could cause system crashes or temporary denial of service, potentially requiring reboot.
If Mitigated
With proper access controls limiting privileged users, impact is minimal as exploitation requires local privileged access.
🎯 Exploit Status
Exploitation requires local privileged access and knowledge of UEFI firmware internals. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: UEFI firmware updates provided by system manufacturers
Vendor Advisory: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01071.html
Restart Required: Yes
Instructions:
1. Check Intel advisory for affected processor models. 2. Contact your system manufacturer for updated UEFI firmware. 3. Apply firmware update following manufacturer instructions. 4. Reboot system to complete update.
🔧 Temporary Workarounds
Restrict privileged access
allLimit local administrative/root access to trusted personnel only
Enable secure boot
allEnsure UEFI Secure Boot is enabled to prevent unauthorized firmware modifications
🧯 If You Can't Patch
- Implement strict access controls to limit local privileged users
- Monitor for unusual system crashes or firmware access attempts
🔍 How to Verify
Check if Vulnerable:
Check system BIOS/UEFI version against manufacturer's patched versions. Use 'dmidecode -t bios' on Linux or 'wmic bios get smbiosbiosversion' on Windows.Check Version:
Linux: dmidecode -t bios | grep Version
Windows: wmic bios get smbiosbiosversionVerify Fix Applied:
Verify UEFI firmware version matches manufacturer's patched version after update. Check that system boots normally without crashes.📡 Detection & Monitoring
Log Indicators:
- Unexpected system crashes/reboots
- Firmware update logs
- Privileged user access to firmware interfaces
Network Indicators:
- None - local access only vulnerability
SIEM Query:
Search for: 'system crash', 'kernel panic', 'firmware access' events from privileged accounts