CVE-2023-23904
📋 TL;DR
A NULL pointer dereference vulnerability in UEFI firmware for certain Intel processors allows privileged local attackers to potentially escalate privileges. This affects systems with vulnerable Intel processors, requiring physical or administrative access to exploit. The vulnerability resides in firmware, making it persistent across operating system installations.
💻 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 gains full system control, bypassing all security controls, potentially installing persistent firmware-level malware.
Likely Case
Privileged user escalates to higher privileges within the operating system, compromising sensitive data and system integrity.
If Mitigated
Attack fails due to lack of local privileged access or firmware protections preventing successful exploitation.
🎯 Exploit Status
Requires privileged local access and detailed knowledge of UEFI firmware internals. No public exploits known.
🛠️ 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 system manufacturer's website for BIOS/UEFI firmware updates. 2. Download appropriate firmware update. 3. Follow manufacturer's flashing instructions carefully. 4. Reboot system to apply update.
🔧 Temporary Workarounds
Restrict local privileged access
allLimit administrative privileges to trusted users only
Enable secure boot
allSecure boot may help prevent unauthorized firmware modifications
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local privileged access
- Monitor for suspicious firmware modification attempts and privilege escalation activities
🔍 How to Verify
Check if Vulnerable:
Check system BIOS/UEFI version against manufacturer's patched versions. Use 'wmic bios get smbiosbiosversion' on Windows or 'dmidecode -t bios' on Linux.Check Version:
Windows: wmic bios get smbiosbiosversion | Linux: sudo dmidecode -t bios | grep VersionVerify Fix Applied:
Verify BIOS/UEFI version matches or exceeds patched version from manufacturer. Check that firmware update was successfully applied.📡 Detection & Monitoring
Log Indicators:
- Unexpected firmware update attempts
- Privilege escalation events
- Suspicious local administrative activity
Network Indicators:
- Not network exploitable - focus on local system monitoring
SIEM Query:
EventID=4672 (Windows) or auth.log privilege changes (Linux) from known administrative accounts