CVE-2024-25077
📋 TL;DR
This vulnerability allows attackers to modify the Nonce value in unsigned flash image headers on Renesas SmartBond devices, bypassing secureboot signature verification. This enables arbitrary code execution through manipulated AES-CTR encryption. Affected are Renesas DA14691, DA14695, DA14697, and DA14699 devices using on-the-fly decryption.
💻 Affected Systems
- Renesas SmartBond DA14691
- Renesas SmartBond DA14695
- Renesas SmartBond DA14697
- Renesas SmartBond DA14699
⚠️ 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
Complete device compromise allowing persistent malware installation, data exfiltration, and use as attack platform within networks.
Likely Case
Remote code execution enabling device takeover, credential theft, and lateral movement in IoT networks.
If Mitigated
Limited impact with proper network segmentation, monitoring, and device hardening preventing exploitation.
🎯 Exploit Status
Requires ability to modify flash image headers and understanding of device encryption implementation. No public exploit code available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/atredispartners/advisories/blob/master/ATREDIS-2024-0001.md
Restart Required: Yes
Instructions:
1. Monitor Renesas security advisories for firmware updates. 2. Apply firmware patches when available. 3. Reflash all affected devices with updated firmware. 4. Verify secureboot functionality post-update.
🔧 Temporary Workarounds
Disable on-the-fly decryption
allDisable the vulnerable flash decryption feature if not required for device functionality
Device-specific configuration commands - consult Renesas documentation
Implement external flash validation
allAdd additional signature verification outside the vulnerable secureboot implementation
Custom firmware modification required
🧯 If You Can't Patch
- Segment affected devices on isolated network segments with strict firewall rules
- Implement continuous monitoring for anomalous device behavior and network traffic
🔍 How to Verify
Check if Vulnerable:
Check device configuration for on-the-fly decryption feature enabled in secureboot settingsCheck Version:
Device-specific AT commands or firmware query commands - consult Renesas documentationVerify Fix Applied:
Verify firmware version against patched releases and test secureboot with modified Nonce values📡 Detection & Monitoring
Log Indicators:
- Unexpected device reboots
- Secureboot verification failures
- Flash write operations outside normal patterns
Network Indicators:
- Anomalous outbound connections from IoT devices
- Unexpected protocol traffic from SmartBond devices
SIEM Query:
source="iot-device" AND (event_type="secureboot_failure" OR event_type="flash_write")