CVE-2022-24418
📋 TL;DR
Dell BIOS contains an improper input validation vulnerability in System Management Mode (SMM). A local authenticated attacker can exploit this via System Management Interrupt (SMI) to execute arbitrary code with SMM privileges, potentially compromising the entire system. This affects Dell client platforms with specific BIOS versions.
💻 Affected Systems
- Dell Latitude
- Dell Precision
- Dell OptiPlex
- Dell XPS
- Dell Inspiron
- Dell Vostro
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SMM-level privileges, allowing persistent malware installation, firmware modification, and bypassing of security controls like Secure Boot and OS-level protections.
Likely Case
Privilege escalation from standard user to SMM-level access, enabling attackers to install persistent backdoors, steal credentials, or disable security features.
If Mitigated
Limited impact with proper BIOS updates applied and SMM protections enabled; attacker would need physical access or local admin privileges to attempt exploitation.
🎯 Exploit Status
Requires local authenticated access and SMM exploitation knowledge; SMM vulnerabilities are complex but powerful when exploited.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BIOS updates specified in DSA-2022-095 for each affected model
Vendor Advisory: https://www.dell.com/support/kbdoc/en-us/000199285/dsa-2022-095
Restart Required: Yes
Instructions:
1. Identify your Dell model and current BIOS version. 2. Visit Dell Support website. 3. Download appropriate BIOS update from DSA-2022-095. 4. Run BIOS update executable with admin privileges. 5. Restart system when prompted.
🔧 Temporary Workarounds
Restrict physical and local access
allLimit physical access to systems and enforce least privilege for local user accounts
Enable BIOS password
allSet BIOS administrator password to prevent unauthorized BIOS modifications
🧯 If You Can't Patch
- Isolate affected systems from critical networks and sensitive data
- Implement strict access controls and monitor for suspicious local privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check BIOS version against affected versions in DSA-2022-095 advisoryCheck Version:
Windows: wmic bios get smbiosbiosversion | Linux: sudo dmidecode -s bios-versionVerify Fix Applied:
Verify BIOS version matches or exceeds patched version from DSA-2022-095📡 Detection & Monitoring
Log Indicators:
- BIOS/UEFI firmware modification events
- Unexpected system restarts with BIOS updates
- SMM-related errors in system logs
Network Indicators:
- Not network exploitable; focus on host-based indicators
SIEM Query:
EventID=12 OR EventID=13 (System startup/shutdown) correlated with BIOS/UEFI modification events