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Security researchers Alexander Kozlov and Sergey Anufrienko uncovered six critical vulnerabilities in Thales (formerly Gemalto) Cinterion chips, which are widely used in automotive telematics, smart homes, and industrial IoT. Their research, titled “One SMS to Root Them All,” demonstrates how a single SMS can bypass modem security, execute commands, and exfiltrate sensitive data.
Why This Matters
Cinterion modules power critical systems, including:
- Remote vehicle diagnostics
- Emergency call (eCall) systems
- Over-the-air (OTA) firmware updates
- Industrial OT networks
These chips even run Java, expanding attack surfaces.
Research Paper: One SMS to Root Them All
You Should Know: Exploitation & Mitigation
1. Exploiting Cinterion Modems via SMS
Attackers send specially crafted SMS messages to:
- Bypass authentication
- Execute AT commands (e.g., `AT+CFUN=1` to reset the modem)
- Retrieve files (
AT+WGET=file.txt) - Enable debug modes (
AT^DEBUG=1)
Example Malicious SMS Payload:
echo -e "AT+CMGS=1\r\n\x1A" | socat - tcp-connect:TARGET_IP:5555
2. Mitigation Steps
- Disable unused SMS functionalities on embedded devices:
AT+CSMS=0 Disable SMS service
- Apply firmware patches from Thales.
- Network segmentation to isolate IoT/OT devices.
- Monitor AT command logs for anomalies.
3. Detecting Attacks
Use Linux-based tools to analyze modem traffic:
tshark -i eth0 -Y "gsm_sms" -V Capture SMS traffic
Or with Wireshark filters:
gsm_sms.tp-oa == "ATTACKER_NUMBER"
4. Hardening Java-Enabled Modules
Since Cinterion uses Java, restrict JAR execution:
java -Djava.security.manager -Djava.security.policy==restrict.policy
What Undercode Say
This research highlights the fragility of IoT/OT ecosystems. A single SMS can compromise vehicles, industrial systems, and smart cities. Key takeaways:
– Always disable unused services (SMS, FTP, Telnet).
– Use firewalls to block unauthorized AT commands.
– Log all modem interactions (AT+WLOG=1).
– Update embedded firmware regularly.
Relevant Commands for Further Analysis:
Check active modem connections (Linux) ls /dev/ttyACM Send AT commands via terminal screen /dev/ttyACM0 115200 Dump modem firmware (risky) AT^SFD=0,0,/firmware.bin
Expected Output:
Awareness of embedded device risks and actionable hardening steps.
References:
Reported By: Alexrweyemamu Using – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
