CVE-2022-22819
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code on affected NXP LPC55S6x microcontrollers by exploiting a buffer overflow during SB2 update parsing before signature verification. The attack requires physical access or ability to deliver a crafted unsigned update, affecting devices using ROM version 1B of these specific microcontroller models.
💻 Affected Systems
- NXP LPC55S66JBD64
- NXP LPC55S66JBD100
- NXP LPC55S66JEV98
- NXP LPC55S69JBD64
- NXP LPC55S69JBD100
- NXP LPC55S69JEV98
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent or non-persistent code execution, potentially enabling firmware modification, data theft, or device bricking.
Likely Case
Temporary code execution during update process allowing privilege escalation or bypassing security controls, but requiring physical access or update delivery mechanism.
If Mitigated
No impact if proper update signature verification is enforced and unsigned updates are rejected before parsing.
🎯 Exploit Status
Exploitation requires crafting malicious SB2 update file and ability to deliver it to device, but no authentication needed once update process is initiated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: ROM versions after 1B
Vendor Advisory: https://www.nxp.com
Restart Required: Yes
Instructions:
1. Contact NXP for updated ROM version. 2. Replace microcontroller or flash updated ROM. 3. Verify new ROM version is installed. 4. Test system functionality.
🔧 Temporary Workarounds
Disable unsigned updates
allConfigure system to reject all unsigned SB2 updates before parsing
Configuration depends on specific implementation; consult device documentation
Physical access controls
allRestrict physical access to devices and update interfaces
🧯 If You Can't Patch
- Implement strict physical security controls around devices
- Use secure boot with signature verification before update parsing
🔍 How to Verify
Check if Vulnerable:
Check ROM version via device debug interface or manufacturer tools; version 1B indicates vulnerabilityCheck Version:
Device-specific command via debug interface; consult NXP documentationVerify Fix Applied:
Verify ROM version is updated to post-1B version and test that unsigned updates are rejected📡 Detection & Monitoring
Log Indicators:
- Failed update attempts
- Unexpected update processes
- Debug interface access logs
Network Indicators:
- Unexpected update file transfers to devices
SIEM Query:
Search for: 'update_failed' OR 'unsigned_update' OR 'ROM_version_1B' in device logs