CVE-2023-41833
📋 TL;DR
A race condition vulnerability in UEFI firmware for certain Intel processors allows a privileged local attacker to potentially escalate privileges. This affects systems with vulnerable Intel processors and UEFI firmware implementations. Attackers must already have local privileged access to exploit this vulnerability.
💻 Affected Systems
- Intel processors with vulnerable UEFI firmware implementations
⚠️ 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 gains kernel-level or firmware-level access, potentially compromising the entire system and bypassing security controls.
Likely Case
Privileged attacker escalates from user/admin to higher system privileges, enabling persistence and lateral movement.
If Mitigated
Attack fails due to proper access controls, patched firmware, or lack of privileged initial access.
🎯 Exploit Status
Exploitation requires local privileged access and knowledge of specific UEFI firmware implementation details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: UEFI firmware updates from system/OEM 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 processors. 2. Contact system/OEM manufacturer for UEFI firmware updates. 3. Apply UEFI firmware update following manufacturer instructions. 4. Reboot system to activate new firmware.
🔧 Temporary Workarounds
Restrict local privileged access
allLimit users with local administrative/root privileges to reduce attack surface
Enable secure boot
allEnsure UEFI secure boot is enabled to verify firmware integrity
🧯 If You Can't Patch
- Implement strict access controls to limit local privileged accounts
- Monitor for unusual privilege escalation attempts and system firmware modifications
🔍 How to Verify
Check if Vulnerable:
Check system BIOS/UEFI firmware version against manufacturer's patched versions. Use 'dmidecode' on Linux or system information tools on Windows.Check Version:
Linux: 'sudo dmidecode -t bios' or 'sudo cat /sys/class/dmi/id/bios_version'. Windows: 'wmic bios get smbiosbiosversion'Verify Fix Applied:
Verify UEFI firmware version matches patched version from manufacturer after update and reboot.📡 Detection & Monitoring
Log Indicators:
- Unexpected firmware modification attempts
- Privilege escalation patterns
- UEFI/BIOS access logs
Network Indicators:
- None - local attack only
SIEM Query:
Search for: firmware modification events, privilege escalation from local accounts, UEFI access attempts