CVE-2022-28194
📋 TL;DR
This vulnerability in NVIDIA Jetson Linux Driver Package allows local attackers with elevated privileges to exploit a memory buffer overflow in the Cboot module when TFTP is enabled. Successful exploitation could lead to code execution, integrity loss, limited denial of service, and confidentiality impacts. It affects NVIDIA Jetson systems running vulnerable versions of the Linux Driver Package.
💻 Affected Systems
- NVIDIA Jetson Linux Driver Package
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Privileged attacker gains full system control through code execution, potentially compromising the entire device and connected systems.
Likely Case
Local attacker with elevated privileges causes system instability, denial of service, or limited code execution within the Cboot context.
If Mitigated
With proper privilege separation and TFTP disabled, impact is limited to denial of service from buffer overflow.
🎯 Exploit Status
Requires local access, elevated privileges, and TFTP enabled. Buffer overflow in tegrabl_cbo.c module.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 32.7.2 and later
Vendor Advisory: https://nvidia.custhelp.com/app/answers/detail/a_id/5343
Restart Required: Yes
Instructions:
1. Download NVIDIA Jetson Linux Driver Package version 32.7.2 or later from NVIDIA developer site. 2. Follow NVIDIA's flashing instructions to update the system. 3. Reboot the device after update completes.
🔧 Temporary Workarounds
Disable TFTP in Cboot
linuxDisable TFTP protocol in Cboot configuration to prevent exploitation vector.
Modify Cboot configuration to set TFTP_ENABLE=0
Rebuild and flash Cboot image if necessary
Restrict Privileged Access
linuxImplement strict privilege separation to prevent local users from gaining elevated privileges.
Review and tighten sudoers configuration
Implement least privilege principles for all user accounts
🧯 If You Can't Patch
- Disable TFTP protocol in all Cboot configurations immediately.
- Implement strict access controls to prevent local users from obtaining elevated privileges.
🔍 How to Verify
Check if Vulnerable:
Check Jetson Linux Driver Package version: cat /etc/nv_tegra_release | grep 'R32' and verify version is earlier than 32.7.2.Check Version:
cat /etc/nv_tegra_release | grep 'R32 (release)'Verify Fix Applied:
Verify version is 32.7.2 or later: cat /etc/nv_tegra_release | grep 'R32 (release)' and check version number.📡 Detection & Monitoring
Log Indicators:
- Cboot/TFTP related crashes or abnormal termination
- Memory access violation logs in system logs
- Unexpected privilege escalation attempts
Network Indicators:
- TFTP traffic to/from Jetson devices in unexpected patterns
- Unusual network activity from Cboot services
SIEM Query:
source="system_logs" AND ("tegrabl_cbo" OR "Cboot" OR "TFTP") AND ("segmentation fault" OR "buffer overflow" OR "memory violation")