CVE-2022-24415
📋 TL;DR
This CVE describes an improper input validation vulnerability in Dell BIOS that allows a local authenticated malicious user to exploit System Management Interrupt (SMI) handlers to execute arbitrary code in System Management Mode (SMM). This affects Dell systems with vulnerable BIOS versions, potentially allowing attackers to bypass security controls and gain elevated privileges.
💻 Affected Systems
- Various Dell client platforms and enterprise systems
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could gain persistent, high-privilege code execution at the firmware level, potentially installing rootkits, bypassing operating system security controls, and maintaining persistence across OS reinstalls.
Likely Case
Malicious insiders or attackers who have gained initial access could escalate privileges to SMM level, allowing them to bypass security software, steal credentials, and maintain persistence on affected systems.
If Mitigated
With proper access controls and BIOS updates, the risk is significantly reduced, though physical access or compromised local accounts could still pose a threat.
🎯 Exploit Status
Exploitation requires local authenticated access and knowledge of System Management Mode exploitation. No public proof-of-concept has been released.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BIOS updates provided by Dell - specific versions vary by system model
Vendor Advisory: https://www.dell.com/support/kbdoc/en-us/000197057/dsa-2022-053
Restart Required: Yes
Instructions:
1. Identify your Dell system model and current BIOS version. 2. Visit Dell Support website and search for BIOS updates for your specific model. 3. Download and install the BIOS update following Dell's instructions. 4. Restart the system as required by the BIOS update process.
🔧 Temporary Workarounds
Restrict physical and local access
allLimit physical access to systems and enforce strong authentication controls to prevent unauthorized local access
Enable BIOS password protection
allSet strong BIOS passwords to prevent unauthorized BIOS modifications
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local access to affected systems
- Monitor for suspicious BIOS modification attempts and implement endpoint detection for SMM exploitation indicators
🔍 How to Verify
Check if Vulnerable:
Check your Dell system's BIOS version against the affected versions listed in Dell advisory DSA-2022-053. On Windows: Run 'wmic bios get smbiosbiosversion'. On Linux: Run 'sudo dmidecode -s bios-version'.Check Version:
Windows: wmic bios get smbiosbiosversion | Linux: sudo dmidecode -s bios-versionVerify Fix Applied:
Verify BIOS version has been updated to a patched version listed in Dell's advisory. Re-run the version check commands to confirm updated version.📡 Detection & Monitoring
Log Indicators:
- Unexpected BIOS/UEFI firmware modifications
- SMI handler execution anomalies
- Failed BIOS update attempts
Network Indicators:
- No network-based indicators as this is a local exploit
SIEM Query:
Search for: BIOS/UEFI firmware modification events, unauthorized local privilege escalation attempts, SMI-related system calls from user space